DynamicPredicateBuilder 使用說明

支援環境：.NET 9; .NET 8; .NET 7
核心特色：動態過濾、排序、分頁、欄位查詢權限、巢狀/多組條件、NOT 取反、重複條件自動去除。

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目錄

1. 快速開始
2. 欄位查詢權限設定
3. 進階條件組合功能
4. 支援的運算子
5. 支援的資料類型
6. 集合型別欄位查詢支援
7. API 使用範例
8. 核心類別與 API 參考
9. 與 jQuery DataTables Server-Side 搭配
10. 常用 Extension
11. FilterDictionaryBuilder - Fluent API 建構器
12. SortRuleBuilder - 排序建構器
13. 單元測試
14. 安裝與使用
15. 進階功能與最佳實務
16. 貢獻指南
17. 授權條款
18. 版本歷史與更新日誌
19. 常見問題 (FAQ)
20. 導覽屬性查詢支援
21. 陣列導覽屬性查詢

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1. 快速開始

1-1. 安裝套件

dotnet add package DynamicPredicateBuilder

1-2. 基本使用

using DynamicPredicateBuilder; using DynamicPredicateBuilder.Models; using DynamicPredicateBuilder.Core; [HttpPost("people")] public IActionResult QueryPeople([FromBody] QueryRequest request) { // 從 JSON 解析 FilterGroup var filterGroup = FilterGroupFactory.FromJsonElement(request.Filter); // 建立查詢條件 var predicate = FilterBuilder.Build<Person>(filterGroup); // 執行查詢 var data = _db.People .Where(predicate) .ApplySort(request.Sort) .Skip((request.Page - 1) * request.PageSize) .Take(request.PageSize) .ToList(); var totalCount = _db.People.Where(predicate).Count(); return Ok(new QueryResult<Person> { TotalCount = totalCount, Items = data }); }

1-3. 使用 FilterEngine 簡化操作

[HttpPost("people/simple")] public IActionResult QueryPeopleSimple([FromBody] QueryRequest request) { var result = _db.People.ApplyQuery(request); return Ok(result); }

1-4. 使用 FilterDictionaryBuilder 程式化建構

[HttpPost("people/fluent")] public IActionResult QueryPeopleWithBuilder() { // 使用 Fluent API 建構過濾條件 var filterGroup = FilterDictionaryBuilder.QueryBuilder<Person>() .WithLogicalOperator(LogicalOperator.And) .GreaterThan(x => x.Age, 25) .Like(x => x.Name, "John") .Compare(LogicalOperator.Or, subRules => subRules .Equal(x => x.Address.City, "Taipei") .Equal(x => x.Address.City, "Kaohsiung") ) .ToFilterGroup(); var predicate = FilterBuilder.Build<Person>(filterGroup); var result = _db.People.Where(predicate).ToList(); return Ok(result); }

1-5. 導覽屬性查詢範例

[HttpPost("employees/search")] public IActionResult SearchEmployees() { // 查詢導覽屬性：員工部門和技能 var filterGroup = FilterDictionaryBuilder.QueryBuilder<Employee>() .WithLogicalOperator(LogicalOperator.And) .Equal(x => x.Department.Name, "Engineering") // 部門名稱 .Contains(x => x.Profile.Skills, "C#") // 員工技能 .GreaterThan(x => x.Salary, 50000) // 薪資條件 .ToFilterGroup(); var predicate = FilterBuilder.Build<Employee>(filterGroup); // 重要：必須 Include 導覽屬性 var employees = _db.Employees .Include(e => e.Department) .Include(e => e.Profile) .Where(predicate) .ToList(); return Ok(employees); }

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2. 欄位查詢權限設定

2-1. 程式碼指定可查詢欄位

[HttpPost("people")] public IActionResult QueryPeople([FromBody] QueryRequest request) { var options = new FilterOptions { AllowedFields = new HashSet<string> { "Name", "Age", "Address.City" } }; var filterGroup = FilterGroupFactory.FromJsonElement(request.Filter); var predicate = FilterBuilder.Build<Person>(filterGroup, options); var data = _db.People .Where(predicate) .ApplySort(request.Sort) .ApplyPaging(request.Page, request.PageSize, out var total); return Ok(new QueryResult<Person> { TotalCount = total, Items = data }); }

2-2. 使用 Attribute 自動擷取可查詢欄位

public class Person { [Queryable] public string Name { get; set; } = string.Empty; [Queryable] public int Age { get; set; } public string Password { get; set; } = string.Empty; // ❌ 未標註，不可查詢 [Queryable] public Address Address { get; set; } = new(); } public class Address { [Queryable] public string City { get; set; } = string.Empty; public string SecretNote { get; set; } = string.Empty; // ❌ 不可查詢 } [HttpPost("people")] public IActionResult QueryPeople([FromBody] QueryRequest request) { var options = new FilterOptions { AllowedFields = QueryableFieldHelper.GetQueryableFields<Person>() }; var filterGroup = FilterGroupFactory.FromJsonElement(request.Filter); var predicate = FilterBuilder.Build<Person>(filterGroup, options); // 其餘程式碼同上... }

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3. 進階條件組合功能

3-1. 多組條件 (List)

FilterBuilder.Build<T>(IEnumerable<FilterGroup> groups, FilterOptions?) 允許在「群組與群組」之間再指定 AND / OR （InterOperator），例如：

var groups = new List<FilterGroup> { // Group 1： !(Name == "Boss") AND Age > 40 new() { LogicalOperator = LogicalOperator.And, InterOperator = LogicalOperator.Or, Rules = [ new FilterRule { Property = "Name", Operator = FilterOperator.Equal, Value="Boss", IsNegated=true }, new FilterRule { Property = "Age", Operator = FilterOperator.GreaterThan, Value=40 } ] }, // Group 2：NOT (Status == "Retired") new() { IsNegated = true, LogicalOperator = LogicalOperator.And, Rules = [ new FilterRule { Property = "Status", Operator = FilterOperator.Equal, Value="Retired" } ] } }; var predicate = FilterBuilder.Build<Person>(groups).Compile();

邏輯相當於：( !(Name == "Boss") && Age > 40 ) OR !(Status == "Retired")

3-2. 巢狀群組 (Nested Group)

FilterGroup.Rules 可再放子 FilterGroup，自然形成括號優先：

{ "LogicalOperator": "And", "Rules": [ { "Property": "Age", "Operator": "GreaterThan", "Value": 25 }, { "LogicalOperator": "Or", "IsNegated": true, "Rules": [ { "Property": "Status", "Operator": "Equal", "Value": "Retired" }, { "Property": "Status", "Operator": "Equal", "Value": "Fired" } ] } ] }

等同 SQL：Age > 25 AND NOT (Status = 'Retired' OR Status = 'Fired')

3-3. NOT 取反

• 單條件：FilterRule.IsNegated = true
• 整組：FilterGroup.IsNegated = true

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4. 支援的運算子

4-1. 基本運算子

運算子	說明	範例
Equal	等於	Name == "John"
NotEqual	不等於	Name != "John"
GreaterThan	大於	Age > 30
GreaterThanOrEqual	大於等於	Age >= 30
LessThan	小於	Age < 30
LessThanOrEqual	小於等於	Age <= 30

4-2. 字串運算子

運算子	說明	範例
Contains	包含	Name.Contains("John")
NotContains	不包含	!Name.Contains("John")
StartsWith	開始於	Name.StartsWith("J")
EndsWith	結束於	Name.EndsWith("n")
Like	SQL LIKE 模式	Name LIKE '%John%'
NotLike	SQL NOT LIKE 模式	Name NOT LIKE '%Admin%'

4-3. 集合運算子

運算子	說明	範例
In	值在集合中	Status IN ('Active', 'Pending')
NotIn	值不在集合中	Status NOT IN ('Disabled', 'Banned')
Any	集合中任一元素符合條件或集合非空	Tags.Any() 或 Tags.Any(t => t == "VIP")
NotAny	集合中沒有元素符合條件或集合為空	!Tags.Any() 或 !Tags.Any(t => t == "VIP")

4-4. 範圍運算子

運算子	說明	範例
Between	在範圍內	Age BETWEEN 20 AND 30
NotBetween	不在範圍內	Age NOT BETWEEN 20 AND 30

4-5. 新增運算子使用範例

// NotLike：檢查屬性值不符合指定的模式 new FilterRule { Property = "Name", Operator = FilterOperator.NotLike, Value = "%Admin%" } // Between：檢查屬性值是否在指定範圍內 new FilterRule { Property = "Age", Operator = FilterOperator.Between, Value = new[] { 20, 30 } } // NotBetween：檢查屬性值是否不在指定範圍內 new FilterRule { Property = "Age", Operator = FilterOperator.NotBetween, Value = new[] { 20, 30 } } // Any：檢查集合屬性是否有任何元素（不提供值時） new FilterRule { Property = "Tags", Operator = FilterOperator.Any, Value = null } // Any：檢查集合屬性是否包含指定值（提供值時） new FilterRule { Property = "Tags", Operator = FilterOperator.Any, Value = "VIP" } // NotAny：檢查集合屬性是否沒有任何元素（不提供值時） new FilterRule { Property = "Tags", Operator = FilterOperator.NotAny, Value = null } // NotAny：檢查集合屬性是否不包含指定值（提供值時） new FilterRule { Property = "Tags", Operator = FilterOperator.NotAny, Value = "Banned" }

4-6. Any 和 NotAny 操作符詳細說明

Any 和 NotAny 操作符針對集合屬性提供了靈活的查詢功能：

Any 操作符：

• 當 Value 為 null 時：檢查集合是否有任何元素（相當於 collection.Any()）
• 當 Value 有值時：檢查集合是否包含該值（相當於 collection.Any(x => x == value)）

NotAny 操作符：

• 當 Value 為 null 時：檢查集合是否沒有任何元素（相當於 !collection.Any()）
• 當 Value 有值時：檢查集合是否不包含該值（相當於 !collection.Any(x => x == value)）

使用範例：

// 使用 FilterDictionaryBuilder var filterGroup = FilterDictionaryBuilder.QueryBuilder<User>() .Any(x => x.Tags) // 檢查用戶是否有任何標籤 .Any(x => x.Categories, "Premium") // 檢查用戶是否有 "Premium" 分類 .NotAny(x => x.Flags) // 檢查用戶是否沒有任何旗標 .NotAny(x => x.Labels, "Banned") // 檢查用戶是否沒有 "Banned" 標籤 .ToFilterGroup(); // 直接使用 FilterRule var rules = new [] { new FilterRule { Property = "Tags", Operator = FilterOperator.Any, Value = null }, // 有任何標籤 new FilterRule { Property = "Categories", Operator = FilterOperator.Any, Value = "VIP" }, // 包含 VIP 分類 new FilterRule { Property = "Blacklist", Operator = FilterOperator.NotAny, Value = null }, // 黑名單為空 new FilterRule { Property = "Restrictions", Operator = FilterOperator.NotAny, Value = "Active" } // 不包含活躍限制 };

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5. 支援的資料類型

5-1. 基本數值類型

類型	描述	範例
int, int?	32位整數	Age = 25
long, long?	64位整數	Id = 1234567890L
decimal, decimal?	高精度十進位	Salary = 50000.50m
double, double?	雙精度浮點數	Score = 95.5
float, float?	單精度浮點數	Rate = 3.14f

5-2. 日期時間類型

類型	描述	範例
DateTime, DateTime?	日期時間	CreatedDate = DateTime.Now
DateOnly, DateOnly?	僅日期 (.NET 6+)	BirthDate = DateOnly.FromDateTime(DateTime.Now)
TimeOnly, TimeOnly?	僅時間 (.NET 6+)	WorkTime = TimeOnly.FromDateTime(DateTime.Now)

5-3. 字串與字元類型

類型	描述	範例
string	字串（可為 null）	Name = "John"
char, char?	單一字元	Gender = 'M'

5-4. 布林類型

類型	描述	範例
bool, bool?	布林值	IsActive = true

5-5. 其他特殊類型

類型	描述	範例
Guid, Guid?	全域唯一識別碼	UserId = Guid.NewGuid()
Enum	列舉類型	Status = UserStatus.Active

5-6. Nullable 類型特殊處理

DynamicPredicateBuilder 對所有 nullable 類型提供完整支援：

// Nullable decimal 查詢範例 public class Product { public string Name { get; set; } public decimal? Price { get; set; } // 可為 null 的價格 public decimal? Discount { get; set; } // 可為 null 的折扣 } // 查詢有價格的商品 new FilterRule { Property = "Price", Operator = FilterOperator.GreaterThan, Value = 0 } // 查詢沒有設定價格的商品 new FilterRule { Property = "Price", Operator = FilterOperator.Equal, Value = null } // 查詢價格在範圍內的商品 new FilterRule { Property = "Price", Operator = FilterOperator.Between, Value = new[] { 100m, 1000m } } // 查詢價格在指定清單中的商品 new FilterRule { Property = "Price", Operator = FilterOperator.In, Value = new[] { 99.9m, 199.9m, 299.9m } }

5-7. 類型轉換與安全性

FilterBuilder 內建智慧型類型轉換機制：

• 安全轉換：使用 TryParse 方法避免轉換例外
• Nullable 支援：正確處理 null 值比較
• 精度保持：decimal 類型保持完整精度
• 自動推導：根據屬性類型自動選擇最佳轉換策略

// 即使前端傳送字串，也會自動轉換為正確的數值類型 new FilterRule { Property = "Salary", Operator = FilterOperator.GreaterThan, Value = "50000" } // 內部會自動轉換為 decimal 50000 // 支援科學記號 new FilterRule { Property = "BigNumber", Operator = FilterOperator.Equal, Value = "1.5E+10" }

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6. 集合型別欄位查詢支援

6-1. 欄位路徑格式

• 支援巢狀集合屬性查詢，例如：Orders[].Items[].Name
• 欄位白名單自動展開所有集合層級，格式為 集合屬性名[].屬性名，可多層巢狀

6-2. FilterRule 實例

new FilterRule { Property = "Orders[].Items[].Name", Operator = FilterOperator.In, Value = new[] { "ItemA", "ItemB" } }

這會產生：Orders.SelectMany(o => o.Items).Select(i => i.Name).Any(name => new[] { "ItemA", "ItemB" }.Contains(name))

6-3. 運算子支援

• In：查詢集合屬性是否包含指定值（多值）
• Any：查詢集合屬性是否有任一元素符合條件
• Contains：查詢集合屬性是否包含單一值
• Equal：僅用於非集合屬性
• Like/NotLike：可用於字串型別欄位

注意：查詢集合屬性時，請使用 In、Any、Contains，不要用 Equal 比較集合本身。

6-4. 範例：查詢集合屬性底下的欄位

// 查詢 User 的 Orders 集合底下的 OrderId 是否包含 123 new FilterRule { Property = "Orders[].OrderId", Operator = FilterOperator.In, Value = new[] { 123 } } // 查詢 User 的 Orders 集合底下的 Items 集合底下的 Name 是否包含 "VIP" new FilterRule { Property = "Orders[].Items[].Name", Operator = FilterOperator.In, Value = new[] { "VIP" } }

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7. API 使用範例

7-1. Request 範例（單組簡易）

{ "Filter": { "LogicalOperator": "And", "Rules": [ { "Property": "Age", "Operator": "GreaterThanOrEqual", "Value": 25 }, { "Property": "Address.City", "Operator": "Equal", "Value": "Taipei" } ] }, "Sort": [ { "Property": "Name", "Descending": false }, { "Property": "Age", "Descending": true } ], "Page": 1, "PageSize": 5 }

7-2. Request 範例（多組 + NOT + 巢狀）

{ "FilterGroups": [ { "LogicalOperator": "And", "InterOperator": "Or", "Rules": [ { "Property": "Name", "Operator": "Equal", "Value": "Boss", "IsNegated": true }, { "Property": "Age", "Operator": "GreaterThan", "Value": 40 } ] }, { "IsNegated": true, "LogicalOperator": "And", "Rules": [ { "Property": "Status", "Operator": "Equal", "Value": "Retired" } ] } ], "Sort": [], "Page": 1, "PageSize": 20 }

Controller 收到 FilterGroups 時，呼叫 FilterBuilder.Build<Person>(request.FilterGroups, options)。

7-3. Request 範例（Nullable Decimal 查詢）

{ "Filter": { "LogicalOperator": "And", "Rules": [ { "Property": "Salary", "Operator": "GreaterThan", "Value": 50000.00 }, { "Property": "Bonus", "Operator": "Between", "Value": [1000, 5000] }, { "Property": "Commission", "Operator": "Equal", "Value": null } ] } }

7-4. Response 範例

{ "totalCount": 45, "items": [ { "name": "Alice", "age": 30, "salary": 75000.50, "bonus": 3000.00, "commission": null, "address": { "city": "Taipei" } } ] }

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8. 核心類別與 API 參考

8-1. FilterBuilder

FilterBuilder 是專案的核心類別，負責生成查詢條件的表達式。

主要方法

• Build<T>(FilterGroup group, FilterOptions?)：生成單組條件的查詢表達式
• Build<T>(IEnumerable<FilterGroup> groups, FilterOptions?)：生成多組條件的查詢表達式

// 單組條件 var predicate = FilterBuilder.Build<Person>(filterGroup); // 多組條件 var predicate = FilterBuilder.Build<Person>(filterGroups, options);

8-2. FilterEngine

FilterEngine 提供便利的靜態方法用於快速建立查詢條件。

主要方法

• FromJson<T>(string json)：從 JSON 字串建立查詢表達式
• FromDictionary<T>(Dictionary<string, object> dict)：從字典建立查詢表達式

// 從 JSON 建立 var predicate = FilterEngine.FromJson<Person>(jsonString); // 從字典建立 var predicate = FilterEngine.FromDictionary<Person>(dictionary);

8-3. FilterEngineExtensions

提供 IQueryable 的擴展方法。

主要方法

• ApplyFilterJson<T>(JsonElement filterJson, List<SortRule> sortRules)：套用 JSON 過濾條件
• ApplySort<T>(List<SortRule> sortRules)：套用排序規則
• ApplyQuery<T>(QueryRequest request)：套用完整查詢請求

// 套用完整查詢 var result = _db.People.ApplyQuery(queryRequest); // 僅套用過濾條件 var query = _db.People.ApplyFilterJson(filterJson, sortRules);

8-4. QueryableFieldHelper

提供欄位白名單的功能，確保查詢僅限於允許的欄位。

主要方法

• GetQueryableFields<T>()：解析 [Queryable] 標籤產生欄位白名單
• GetAllowedFields<T>()：取得允許查詢的欄位集合

var allowedFields = QueryableFieldHelper.GetQueryableFields<Person>(); var options = new FilterOptions { AllowedFields = allowedFields };

8-5. FilterGroupFactory

用於從不同來源建立 FilterGroup 物件。

主要方法

• FromDictionary(Dictionary<string, object> dict)：從字典建立 FilterGroup
• FromJsonElement(JsonElement json)：從 JsonElement 建立 FilterGroup

var filterGroup = FilterGroupFactory.FromDictionary(dictionary); var filterGroup = FilterGroupFactory.FromJsonElement(jsonElement);

8-6. 核心資料模型

QueryRequest

public class QueryRequest { public JsonElement Filter { get; set; } public List<SortRule> Sort { get; set; } = new List<SortRule>(); public int Page { get; set; } = 1; public int PageSize { get; set; } = 20; }

QueryResult

public class QueryResult<T> { public int TotalCount { get; set; } public List<T> Items { get; set; } = new List<T>(); }

FilterGroup

public class FilterGroup { public LogicalOperator LogicalOperator { get; set; } = LogicalOperator.And; public LogicalOperator InterOperator { get; set; } = LogicalOperator.And; public bool IsNegated { get; set; } = false; public List<object> Rules { get; set; } = new List<object>(); }

FilterRule

public class FilterRule { public string Property { get; set; } = string.Empty; public FilterOperator Operator { get; set; } = FilterOperator.Equal; public object Value { get; set; } = null!; public bool IsNegated { get; set; } = false; }

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9. 與 jQuery DataTables Server-Side 搭配

以下示範 DataTables 1.13+ 於前端傳送分頁、排序、全域搜尋與欄位搜尋，後端再組成 FilterGroup：

9-1. 前端 JavaScript

<table id="peopleTable" class="display" style="width:100%"> <thead> <tr> <th>Name</th> <th>Age</th> <th>City</th> </tr> <tr><!-- 欄位篩選列 --> <th><input type="text" placeholder="Name" class="col-search" data-col="0"></th> <th><input type="number" placeholder=">= Age" class="col-search" data-col="1"></th> <th><input type="text" placeholder="City" class="col-search" data-col="2"></th> </tr> </thead> </table> <script> $(function () { const table = $('#peopleTable').DataTable({ serverSide: true, processing: true, searchDelay: 600, // 降低後端壓力 ajax: { url: '/api/people/datatable', type: 'POST', contentType: 'application/json', data: function (d) { // 將 DataTables 內建物件轉成您 API 需要的格式 return JSON.stringify({ draw: d.draw, page: Math.floor(d.start / d.length) + 1, pageSize: d.length, sort: d.order.map(o => ({ property: d.columns[o.column].data, descending: o.dir === 'desc' })), filterGroups: buildFilterGroups(d) // 🔑 自訂函式 }); } }, columns: [ { data: 'name' }, { data: 'age' }, { data: 'address.city', render: data => data } // 巢狀欄位 ] }); // 個別欄位即時搜尋 $('.col-search').on('keyup change', function () { table.column($(this).data('col')).search(this.value).draw(); }); // 把 DataTables 搜尋條件轉成 FilterGroup function buildFilterGroups(dt) { const groups = []; // 全域搜尋（LIKE %keyword%） if (dt.search && dt.search.value) { groups.push({ logicalOperator: 'Or', rules: dt.columns .filter(c => c.searchable) .map(c => ({ property: c.data, operator: 'Like', value: dt.search.value })) }); } // 欄位個別搜尋 dt.columns.forEach(c => { if (c.search && c.search.value) { groups.push({ logicalOperator: 'And', rules: [{ property: c.data, operator: 'Like', value: c.search.value }] }); } }); return groups; } }); </script>

9-2. 後端 Controller

[HttpPost("datatable")] public IActionResult DataTableQuery([FromBody] DataTableRequest<QueryRequest> req) { // req.Payload 即前端轉好的 QueryRequest var options = new FilterOptions { AllowedFields = QueryableFieldHelper.GetQueryableFields<Person>() }; // 多組群組 Build var predicate = FilterBuilder.Build<Person>(req.Payload.FilterGroups, options); var query = _db.People.Where(predicate); // 排序、分頁 query = query.ApplySort(req.Payload.Sort); var items = query .Skip((req.Payload.Page - 1) * req.Payload.PageSize) .Take(req.Payload.PageSize) .ToList(); return Ok(new { draw = req.Payload.Draw, recordsTotal = _db.People.Count(), recordsFiltered = query.Count(), data = items }); } // 用來包 DataTables 固定參數 + 您自定義的 QueryRequest public class DataTableRequest<T> { public int Draw { get; set; } public T Payload { get; set; } = default!; }

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10. 常用 Extension

方法	說明
ApplySort(this IQueryable<T>, IEnumerable<SortRule>)	依多欄位排序 (動態排序)。
ApplyPaging(this IQueryable<T>, int page, int size, out int total)	取得總筆數並套用 Skip/Take。
ApplyQuery(this IQueryable<T>, QueryRequest request)	套用完整查詢請求（過濾、排序、分頁）。
ApplyFilterJson(this IQueryable<T>, JsonElement, List<SortRule>?)	套用 JSON 格式過濾條件。
FilterGroupFactory.FromDictionary(IDictionary<string, object>)	把前端 JSON 轉成 FilterGroup 物件。
QueryableFieldHelper.GetQueryableFields<T>()	解析 [Queryable] 標籤產生欄位白名單。

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11. FilterDictionaryBuilder - Fluent API 建構器

FilterDictionaryBuilder 提供 Fluent API 方式來程式化建構過濾條件，支援 Expression 語法和類型安全的屬性參考。

11-1. 基本使用

// 基本條件組合 var filterGroup = FilterDictionaryBuilder.QueryBuilder<Person>() .WithLogicalOperator(LogicalOperator.And) .Equal(x => x.Name, "John") .GreaterThan(x => x.Age, 25) .ToFilterGroup();

11-2. 支援的快捷方法

所有 FilterOperator 的快捷方法

var builder = FilterDictionaryBuilder.QueryBuilder<Person>() // 基本比較 .Equal(x => x.Name, "John") .NotEqual(x => x.Status, "Disabled") .GreaterThan(x => x.Age, 18) .GreaterThanOrEqual(x => x.Salary, 30000) .LessThan(x => x.Age, 65) .LessThanOrEqual(x => x.Experience, 10) // 字串操作 .Contains(x => x.Description, "keyword") .NotContains(x => x.Description, "spam") .StartsWith(x => x.Phone, "02") .EndsWith(x => x.Email, "@company.com") .Like(x => x.Name, "%John%") .NotLike(x => x.Name, "%Admin%") // 集合操作 .In(x => x.Department, new[] { "IT", "HR", "Finance" }) .NotIn(x => x.Status, new[] { "Disabled", "Suspended" }) .Any(x => x.Tags, "VIP") .NotAny(x => x.Tags, "Blacklisted") // 範圍操作 .Between(x => x.Salary, 30000, 80000) .NotBetween(x => x.Age, 16, 18);

11-3. 巢狀條件群組

var filterGroup = FilterDictionaryBuilder.QueryBuilder<Person>() .WithLogicalOperator(LogicalOperator.And) .GreaterThan(x => x.Age, 25) // 巢狀 OR 群組 .Compare(LogicalOperator.Or, subRules => subRules .Equal(x => x.Department, "IT") .Equal(x => x.Department, "Engineering") .Equal(x => x.Department, "Research") ) // 巢狀 AND 群組（可加否定） .Compare(LogicalOperator.And, statusRules => statusRules .NotEqual(x => x.Status, "Retired") .NotEqual(x => x.Status, "Terminated"), isNegated: false) .ToFilterGroup();

11-4. 屬性對屬性比較

var filterGroup = FilterDictionaryBuilder.QueryBuilder<Employee>() // 比較兩個屬性：開始日期 < 結束日期 .AddPropertyComparison(x => x.StartDate, FilterOperator.LessThan, x => x.EndDate) // 薪資大於獎金 .AddPropertyComparison(x => x.Salary, FilterOperator.GreaterThan, x => x.Bonus) .ToFilterGroup();

11-5. 混合 Expression 和字串語法

var filterGroup = FilterDictionaryBuilder.QueryBuilder<Person>() // Expression 語法 - 類型安全 .Equal(x => x.Name, "John") .GreaterThan(x => x.Age, 25) // 字串語法 - 適用於動態屬性 .Equal("DynamicProperty", "value") .Contains(nameof(Person.Description), "keyword") .ToFilterGroup();

11-6. 多種建立方式

// 方式 1: 靜態工廠方法 var builder1 = FilterDictionaryBuilder.QueryBuilder<Person>(); // 方式 2: 泛型靜態方法 var builder2 = FilterDictionaryBuilder.Create<Person>(); // 方式 3: 直接實例化 var builder3 = FilterDictionaryBuilder<Person>.Create();

11-7. 輸出格式

var builder = FilterDictionaryBuilder.QueryBuilder<Person>() .Equal(x => x.Name, "John") .GreaterThan(x => x.Age, 25); // 輸出為字典 Dictionary<string, object> dict = builder.Build(); // 輸出為 FilterGroup FilterGroup group = builder.ToFilterGroup(); // 隱式轉換 Dictionary<string, object> dictImplicit = builder; FilterGroup groupImplicit = builder;

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12. SortRuleBuilder - 排序建構器

SortRuleBuilder 提供 Fluent API 方式來建構排序規則，支援多層排序和 Expression 語法。

12-1. 基本排序

// 簡單排序 var sortRules = SortRuleBuilder.SortBuilder<Person>() .Ascending(x => x.Name) .Descending(x => x.CreatedDate) .Build();

12-2. 多層排序

// 主要排序和次要排序 var sortRules = SortRuleBuilder.SortBuilder<Employee>() .Ascending(x => x.Department) // 先按部門升序 .ThenBy(x => x.Position) // 同部門按職位升序 .ThenByDescending(x => x.Salary) // 同職位按薪資降序 .ThenBy(x => x.Name) // 最後按姓名升序 .Build();

12-3. 支援的排序方法

var builder = SortRuleBuilder.SortBuilder<Person>() // 基本排序方法 .Add(x => x.Property, descending: false) // 通用方法 .Ascending(x => x.Name) // 升序 .Descending(x => x.Age) // 降序 // 次要排序方法 .ThenBy(x => x.Email) // 次要升序 .ThenByDescending(x => x.CreatedDate); // 次要降序

12-4. 字串語法支援

var sortRules = SortRuleBuilder.SortBuilder<Person>() // Expression 語法 .Ascending(x => x.Name) // 字串語法 .Descending(nameof(Person.CreatedDate)) .Add("DynamicProperty", descending: true) .Build();

12-5. 與查詢系統整合

// 建構過濾和排序條件 var filterGroup = FilterDictionaryBuilder.QueryBuilder<Employee>() .GreaterThan(x => x.Salary, 50000) .Equal(x => x.Department, "IT") .ToFilterGroup(); var sortRules = SortRuleBuilder.SortBuilder<Employee>() .Descending(x => x.Salary) .ThenBy(x => x.Name) .Build(); // 建立完整查詢請求 var request = new QueryRequest { Filter = JsonSerializer.SerializeToElement(filterGroup), Sort = sortRules, Page = 1, PageSize = 20 }; // 執行查詢 var result = _context.Employees.ApplyQuery(request);

12-6. 輸出格式

var builder = SortRuleBuilder.SortBuilder<Person>() .Ascending(x => x.Name) .Descending(x => x.Age); // 輸出為列表 List<SortRule> rules = builder.Build(); // 隱式轉換 List<SortRule> rulesList = builder; SortRule[] rulesArray = builder;

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13. 單元測試

DynamicPredicate.Tests 專案示範：

• FilterBuilderTests：Equal、GreaterThan、NOT、巢狀、多組 AND/OR 等核心功能測試
• FilterDictionaryBuilderTests：Fluent API 建構器測試
• SortRuleBuilderTests：排序建構器測試
• Nullable Decimal Tests：完整的 decimal? 類型測試案例
• 測試資料模型：User.cs 提供測試用的資料結構

執行測試

dotnet test

測試範例

[Fact] public void BuildPredicate_WithMultipleGroups_ShouldCombineCorrectly() { var groups = new List<FilterGroup> { // Group 1： !(Name == "Boss") AND Age > 40 new() { LogicalOperator = LogicalOperator.And, InterOperator = LogicalOperator.Or, Rules = [ new FilterRule { Property = "Name", Operator = FilterOperator.Equal, Value = "Boss", IsNegated = true }, new FilterRule { Property = "Age", Operator = FilterOperator.GreaterThan, Value = 40 } ] }, // Group 2：NOT (Status == "Retired") new() { IsNegated = true, LogicalOperator = LogicalOperator.And, Rules = [ new FilterRule { Property = "Status", Operator = FilterOperator.Equal, Value = "Retired" } ] } }; var predicate = FilterBuilder.Build<User>(groups).Compile(); predicate(new User { Name = "Snake", Age = 20 }).Should().BeTrue(); // Group1 滿足 predicate(new User { Name = "Otacon", Age = 50 }).Should().BeTrue(); // Group2 滿足 predicate(new User { Name = "Otacon", Age = 30 }).Should().BeFalse(); } [Fact] public void FilterDictionaryBuilder_WithExpressionSyntax_ShouldWork() { var filterGroup = FilterDictionaryBuilder.QueryBuilder<User>() .WithLogicalOperator(LogicalOperator.And) .Equal(x => x.Name, "John") .GreaterThan(x => x.Age, 25) .Compare(LogicalOperator.Or, subRules => subRules .Equal(x => x.Department, "IT") .Equal(x => x.Department, "HR") .Equal(x => x.Department, "Research") ) .ToFilterGroup(); var predicate = FilterBuilder.Build<User>(filterGroup).Compile(); // 測試條件 predicate(new User { Name = "John", Age = 30, Department = "IT" }).Should().BeTrue(); predicate(new User { Name = "John", Age = 30, Department = "Finance" }).Should().BeFalse(); }

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14. 安裝與使用

14-1. 系統需求

• .NET 7.0 或更高版本
• .NET 8.0 或更高版本
• .NET 9.0 或更高版本

14-2. NuGet 安裝

dotnet add package DynamicPredicateBuilder

14-3. 基本設定

using DynamicPredicateBuilder; using DynamicPredicateBuilder.Models; using DynamicPredicateBuilder.Core; // 在 Program.cs 或 Startup.cs 中註冊服務（可選） services.AddScoped<FilterOptions>();

14-4. 在控制器中使用

[ApiController] [Route("api/[controller]")] public class PeopleController : ControllerBase { private readonly IDbContext _context; public PeopleController(IDbContext context) { _context = context; } [HttpPost("query")] public IActionResult Query([FromBody] QueryRequest request) { var result = _context.People.ApplyQuery(request); return Ok(result); } [HttpPost("query-builder")] public IActionResult QueryWithBuilder() { // 使用 FilterDictionaryBuilder var filterGroup = FilterDictionaryBuilder.QueryBuilder<Person>() .WithLogicalOperator(LogicalOperator.And) .GreaterThan(x => x.Age, 18) .Like(x => x.Name, "John") .ToFilterGroup(); // 使用 SortRuleBuilder var sortRules = SortRuleBuilder.SortBuilder<Person>() .Descending(x => x.CreatedDate) .ThenBy(x => x.Name) .Build(); var predicate = FilterBuilder.Build<Person>(filterGroup); var result = _context.People .Where(predicate) .ApplySort(sortRules) .ToList(); return Ok(result); } }

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15. 進階功能與最佳實務

15-1. 效能最佳化

• 使用 AsNoTracking() 提升查詢效能
• 在經常查詢的欄位加上索引
• 適當使用 IQueryable 延遲執行特性

var result = _context.People .AsNoTracking() .ApplyQuery(request);

15-2. 安全性考量

• 始終使用 FilterOptions.AllowedFields 限制可查詢欄位
• 驗證輸入資料的型別和範圍
• 避免暴露敏感資料欄位

15-3. 錯誤處理

try { var filterGroup = FilterGroupFactory.FromJsonElement(request.Filter); var predicate = FilterBuilder.Build<Person>(filterGroup, options); // ... 執行查詢 } catch (ArgumentException ex) { return BadRequest($"Invalid filter: {ex.Message}"); } catch (Exception ex) { _logger.LogError(ex, "Query execution failed"); return StatusCode(500, "Internal server error"); }

15-4. 陣列導覽屬性效能最佳化

// 避免在迴圈中執行陣列導覽查詢 // ❌ 錯誤做法 foreach (var contractId in contractIds) { var contract = _context.Contracts .Include(c => c.BuildContracts) .ThenInclude(bc => bc.Build) .FirstOrDefault(c => c.Id == contractId); } // ✅ 正確做法：批次查詢 var contracts = _context.Contracts .Include(c => c.BuildContracts) .ThenInclude(bc => bc.Build) .Where(c => contractIds.Contains(c.Id)) .ToList();

15-5. 記憶體使用優化

// 大量資料處理時使用串流處理 await foreach (var contract in _context.Contracts .Where(predicate) .AsAsyncEnumerable()) { // 逐筆處理，減少記憶體使用 await ProcessContractAsync(contract); }

15-6. 查詢快取策略

// 使用 IMemoryCache 快取經常查詢的結果 public async Task<List<Contract>> GetCachedContractsAsync(FilterGroup filterGroup) { var cacheKey = $"contracts_{JsonConvert.SerializeObject(filterGroup)}"; if (!_cache.TryGetValue(cacheKey, out List<Contract> contracts)) { var predicate = FilterBuilder.Build<Contract>(filterGroup); contracts = await _context.Contracts .Include(c => c.BuildContracts) .ThenInclude(bc => bc.Build) .Where(predicate) .ToListAsync(); _cache.Set(cacheKey, contracts, TimeSpan.FromMinutes(10)); } return contracts; }

15-7. 陣列導覽屬性安全性

// 限制陣列導覽屬性的查詢權限 var options = new FilterOptions { AllowedFields = new HashSet<string> { "Name", "CreatedDate", "BuildContracts[].Amount", // 允許查詢合約金額 "BuildContracts[].Build.Name", // 允許查詢建案名稱 "BuildContracts[].Build.Location" // 允許查詢建案位置 // "BuildContracts[].Build.SecretInfo" // 敏感資訊不允許查詢 } }; // 驗證查詢深度，防止過深的陣列導覽 public static bool ValidateNavigationDepth(string property, int maxDepth = 3) { var depth = property.Count(c => c == '['); return depth <= maxDepth; }

15-8. 輸入驗證與清理

// 驗證和清理陣列導覽屬性輸入 public static string SanitizeNavigationProperty(string property) { // 移除不安全的字元 var sanitized = Regex.Replace(property, @"[^\w\[\]\.]", ""); // 驗證格式 var pattern = @"^[a-zA-Z_][a-zA-Z0-9_]*(\[[]\])?(\.[a-zA-Z_][a-zA-Z0-9_]*(\[[]\])?)*$"; if (!Regex.IsMatch(sanitized, pattern)) throw new ArgumentException("Invalid navigation property format"); return sanitized; }

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16. 貢獻指南

我們歡迎所有的貢獻！請依照以下步驟進行貢獻：

1. Fork 此專案
2. 提交您的改動
3. 發送 Pull Request

我們會儘快檢視您的變更！

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17. 授權條款

本專案採用 MIT 授權條款。詳情請參閱 LICENSE 檔案。

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18. 版本歷史與更新日誌

v1.0.0 - 2023-10-10

• 初始版本發佈

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19. 常見問題 (FAQ)

Q1：如何處理日期時間的時區問題？
A1：建議在應用程式層級統一處理時區，例如將所有時間轉為 UTC 儲存，再於取出時轉回當地時間。

Q2：支援的資料庫有哪些？
A2：目前測試環境包含 Microsoft SQL Server、SQLite，其他 EF Core 支援的資料庫應亦可正常運作。

Q3：能否處理複雜物件的查詢？
A3：設計上是支援的，但建議查詢條件儘量簡化，以維持查詢效能。

更多問題，歡迎提出 Issue 或 PR！

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20. 導覽屬性查詢支援

DynamicPredicateBuilder 完全支援導覽屬性查詢，讓您能輕鬆查詢關聯資料。以下說明如何使用導覽屬性進行查詢。

20-1. 基本用法

當查詢資料表的同時，想要過濾或搜尋其關聯資料表的欄位時，可使用導覽屬性查詢。

範例：查詢員工的部門名稱

假設 Employee 有一個導覽屬性 Department，我們可以這樣查詢：

var filterGroup = FilterDictionaryBuilder.QueryBuilder<Employee>() .WithLogicalOperator(LogicalOperator.And) .Equal(x => x.Department.Name, "Sales") // 直接查詢部門名稱 .ToFilterGroup(); var predicate = FilterBuilder.Build<Employee>(filterGroup); var result = _db.Employees.Include(e => e.Department).Where(predicate).ToList();

20-2. 多層導覽屬性

支援多層級的導覽屬性查詢，例如：Employee.Profile.Skills。但要注意效能與可能的 null 參考問題。

範例：查詢員工擁有 C# 技能

假設 Employee 有一個導覽屬性 Profile，而 Profile 又有一個集合型別的導覽屬性 Skills：

var filterGroup = FilterDictionaryBuilder.QueryBuilder<Employee>() .WithLogicalOperator(LogicalOperator.And) .Contains(x => x.Profile.Skills, "C#") // 查詢技能集合中是否包含 "C#" .ToFilterGroup(); var predicate = FilterBuilder.Build<Employee>(filterGroup); var result = _db.Employees.Include(e => e.Profile).ThenInclude(p => p.Skills).Where(predicate).ToList();

20-3. 注意事項

• 使用導覽屬性查詢時，必須搭配 Include 方法，將關聯的資料表一併載入。
• 導覽屬性的查詢條件會轉換為 JOIN 條件，因此可能影響效能。
• 建議對常用的導覽屬性建立索引，以提升查詢效能。

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21. 陣列導覽屬性查詢支援

21-1. 概述

DynamicPredicateBuilder 提供完整的陣列導覽屬性查詢功能，支援對集合中的子屬性進行各種查詢操作。透過 FilterDictionaryBuilder 的陣列導覽方法，您可以輕鬆查詢巢狀集合中的資料。

21-2. 陣列導覽語法

所有陣列導覽方法都會自動生成正確的語法格式：``` {集合屬性}[].{目標屬性}

範例： - `BuildContracts[].Build.AptId` - `BuildContracts[].Build.Name` - `BuildContracts[].Build.Location` - `Orders[].Items[].ProductName` ### 21-3. 完整的陣列導覽方法 #### 基本比較方法 ```csharp var builder = FilterDictionaryBuilder.QueryBuilder<Contract>() // 基本等值比較 .ArrayEqual(c => c.BuildContracts, bc => bc.Build.AptId, 1001L) .ArrayNotEqual(c => c.BuildContracts, bc => bc.ContractType, "自住") // 數值比較 .ArrayGreaterThan(c => c.BuildContracts, bc => bc.Amount, 50000m) .ArrayGreaterThanOrEqual(c => c.BuildContracts, bc => bc.Amount, 30000m) .ArrayLessThan(c => c.BuildContracts, bc => bc.Build.AptId, 2000L) .ArrayLessThanOrEqual(c => c.BuildContracts, bc => bc.Amount, 100000m);

字串操作方法

var builder = FilterDictionaryBuilder.QueryBuilder<Contract>() // 字串匹配操作 .ArrayLike(c => c.BuildContracts, bc => bc.Build.Name, "豪宅") // ✨ 新增 Like 匹配 .ArrayNotLike(c => c.BuildContracts, bc => bc.Build.Name, "舊屋") // Not Like 匹配 .ArrayContains(c => c.BuildContracts, bc => bc.Build.Location, "台北") // 包含字串 .ArrayNotContains(c => c.BuildContracts, bc => bc.Build.Name, "違建") // 不包含字串 .ArrayStartsWith(c => c.BuildContracts, bc => bc.Build.Location, "台北市") // 開頭匹配 .ArrayEndsWith(c => c.BuildContracts, bc => bc.Build.Name, "大樓"); // 結尾匹配

集合與範圍方法

var builder = FilterDictionaryBuilder.QueryBuilder<Contract>() // 集合成員查詢 .ArrayIn(c => c.BuildContracts, bc => bc.Build.AptId, new object[] { 1001L, 1002L, 1003L }) .ArrayNotIn(c => c.BuildContracts, bc => bc.ContractType, new object[] { "已取消", "已終止" }) // 範圍查詢 .ArrayBetween(c => c.BuildContracts, bc => bc.Amount, 50000m, 200000m) .ArrayNotBetween(c => c.BuildContracts, bc => bc.Build.AptId, 1000L, 1500L) // 存在性查詢 .ArrayAny(c => c.BuildContracts, bc => bc.Build.AptId) // 集合中有任何元素 .ArrayNotAny(c => c.BuildContracts, bc => bc.IsDeleted); // 集合中沒有元素符合條件

21-4. 實際使用範例

範例 1：基本陣列導覽查詢

[HttpPost("contracts/search")] public IActionResult SearchContracts() { // 查找建案名稱包含 "豪宅" 的合約 var filterGroup = FilterDictionaryBuilder.QueryBuilder<Contract>() .WithLogicalOperator(LogicalOperator.And) .ArrayLike(c => c.BuildContracts, bc => bc.Build.Name, "豪宅") .ToFilterGroup(); var predicate = FilterBuilder.Build<Contract>(filterGroup); var results = _context.Contracts .Include(c => c.BuildContracts) .ThenInclude(bc => bc.Build) .Where(predicate) .ToList(); return Ok(results); }

範例 2：複雜組合查詢

[HttpPost("contracts/advanced-search")] public IActionResult AdvancedSearchContracts() { // 複雜查詢：結合多種陣列導覽方法 var filterGroup = FilterDictionaryBuilder.QueryBuilder<Contract>() .WithLogicalOperator(LogicalOperator.And) .ArrayGreaterThan(c => c.BuildContracts, bc => bc.Build.AptId, 1000L) // AptId > 1000 .ArrayLike(c => c.BuildContracts, bc => bc.Build.Location, "台北市") // 位置包含台北市 .ArrayNotEqual(c => c.BuildContracts, bc => bc.ContractType, "自住") // 非自住合約 .ArrayBetween(c => c.BuildContracts, bc => bc.Amount, 30000m, 100000m) // 金額範圍 .Contains(c => c.Name, "購買") // 合約名稱包含購買 .ToFilterGroup(); var predicate = FilterBuilder.Build<Contract>(filterGroup); var results = _context.Contracts .Include(c => c.BuildContracts) .ThenInclude(bc => bc.Build) .Where(predicate) .ToList(); return Ok(new { count = results.Count, contracts = results }); }

範例 3：電商訂單查詢

[HttpPost("orders/search")] public IActionResult SearchOrders() { // 查找包含特定商品的訂單 var filterGroup = FilterDictionaryBuilder.QueryBuilder<Order>() .WithLogicalOperator(LogicalOperator.And) .ArrayIn(c => c.OrderItems, oi => oi.Product.Category, new object[] { "3C", "家電" }) .ArrayGreaterThan(c => c.OrderItems, oi => oi.Quantity, 1) .ArrayBetween(c => c.OrderItems, oi => oi.UnitPrice, 1000m, 50000m) .GreaterThan(c => c.TotalAmount, 5000m) .ToFilterGroup(); var predicate = FilterBuilder.Build<Order>(filterGroup); var results = _db.Orders .Include(o => o.OrderItems) .ThenInclude(oi => oi.Product) .Where(predicate) .ToList(); return Ok(results); }

21-5. JSON 格式範例

基本陣列導覽查詢 JSON

{ "Filter": { "LogicalOperator": "And", "Rules": [ { "Property": "BuildContracts[].Build.AptId", "Operator": "Equal", "Value": 1001 }, { "Property": "BuildContracts[].Build.Name", "Operator": "Like", "Value": "豪宅" } ] } }

複雜陣列導覽查詢 JSON

{ "Filter": { "LogicalOperator": "And", "Rules": [ { "Property": "BuildContracts[].Build.Location", "Operator": "StartsWith", "Value": "台北市" }, { "Property": "BuildContracts[].Amount", "Operator": "Between", "Value": [30000, 100000] }, { "Property": "BuildContracts[].ContractType", "Operator": "In", "Value": ["購買", "投資"] } ] } }

21-6. 支援的資料類型

資料類型	支援的操作	說明
字串類型	Like, NotLike, Contains, NotContains, StartsWith, EndsWith, Equal, NotEqual	完整支援所有字串操作
數值類型	Equal, NotEqual, GreaterThan, LessThan, Between, NotBetween, In, NotIn	支援所有比較和範圍操作
可空類型	所有對應類型的操作	正確處理 null 值比較
集合類型	In, NotIn, Any, NotAny	支援集合成員和存在性查詢
日期時間	Equal, GreaterThan, LessThan, Between 等	完整支援日期時間比較

21-7. 陣列導覽方法完整列表

方法名稱	對應運算子	說明	使用範例
ArrayEqual	Equal	陣列元素等於指定值	ArrayEqual(c => c.Items, i => i.Id, 123)
ArrayNotEqual	NotEqual	陣列元素不等於指定值	ArrayNotEqual(c => c.Items, i => i.Status, "Deleted")
ArrayLike	Like	陣列元素符合 Like 條件	ArrayLike(c => c.Items, i => i.Name, "產品")
ArrayNotLike	NotLike	陣列元素不符合 Like 條件	ArrayNotLike(c => c.Items, i => i.Name, "測試")
ArrayContains	Contains	陣列元素包含指定字串	ArrayContains(c => c.Items, i => i.Description, "特價")
ArrayNotContains	NotContains	陣列元素不包含指定字串	ArrayNotContains(c => c.Items, i => i.Name, "停產")
ArrayStartsWith	StartsWith	陣列元素以指定字串開頭	ArrayStartsWith(c => c.Items, i => i.Code, "PRD")
ArrayEndsWith	EndsWith	陣列元素以指定字串結尾	ArrayEndsWith(c => c.Items, i => i.Code, "001")
ArrayGreaterThan	GreaterThan	陣列元素大於指定值	ArrayGreaterThan(c => c.Items, i => i.Price, 1000m)
ArrayGreaterThanOrEqual	GreaterThanOrEqual	陣列元素大於等於指定值	ArrayGreaterThanOrEqual(c => c.Items, i => i.Stock, 10)
ArrayLessThan	LessThan	陣列元素小於指定值	ArrayLessThan(c => c.Items, i => i.Weight, 5.0)
ArrayLessThanOrEqual	LessThanOrEqual	陣列元素小於等於指定值	ArrayLessThanOrEqual(c => c.Items, i => i.Discount, 0.3)
ArrayIn	In	陣列元素在指定集合中	ArrayIn(c => c.Items, i => i.Category, new[] {"A", "B"})
ArrayNotIn	NotIn	陣列元素不在指定集合中	ArrayNotIn(c => c.Items, i => i.Status, new[] {"Banned"})
ArrayBetween	Between	陣列元素在指定範圍內	ArrayBetween(c => c.Items, i => i.Price, 100m, 1000m)
ArrayNotBetween	NotBetween	陣列元素不在指定範圍內	ArrayNotBetween(c => c.Items, i => i.Score, 60, 80)
ArrayAny	Any	陣列中有任何元素符合條件	ArrayAny(c => c.Items, i => i.IsActive)
ArrayNotAny	NotAny	陣列中沒有元素符合條件	ArrayNotAny(c => c.Items, i => i.IsDeleted)

21-8. 性能最佳化建議

Include 策略

// ✅ 正確：預先載入所需的導覽屬性 var results = _context.Contracts .Include(c => c.BuildContracts) .ThenInclude(bc => bc.Build) .Where(predicate) .ToList(); // ❌ 錯誤：未載入導覽屬性會導致 N+1 查詢問題 var results = _context.Contracts .Where(predicate) // 這會觸發多次額外查詢 .ToList();

查詢最佳化

// 使用 AsNoTracking() 提升只讀查詢效能 var results = _context.Contracts .AsNoTracking() .Include(c => c.BuildContracts) .ThenInclude(bc => bc.Build) .Where(predicate) .ToList(); // 使用投影減少資料傳輸 var results = _context.Contracts .Include(c => c.BuildContracts) .ThenInclude(bc => bc.Build) .Where(predicate) .Select(c => new ContractDto { Id = c.Id, Name = c.Name, BuildNames = c.BuildContracts.Select(bc => bc.Build.Name).ToList() }) .ToList();

避免深層巢狀

// ❌ 避免過深的陣列導覽 .ArrayEqual(c => c.Level1, l1 => l1.Level2, l2 => l2.Level3, l3 => l3.Level4.Value, "value") // ✅ 建議：限制在 2-3 層以內 .ArrayEqual(c => c.BuildContracts, bc => bc.Build.AptId, 1001L)

21-9. 錯誤處理與驗證

屬性路徑驗證

public static bool ValidateNavigationPath(string propertyPath) { // 驗證陣列導覽語法格式 var pattern = @"^[a-zA-Z_][a-zA-Z0-9_]*(\[\](\.[a-zA-Z_][a-zA-Z0-9_]*)+)*$"; return Regex.IsMatch(propertyPath, pattern); } // 使用範例 if (!ValidateNavigationPath("BuildContracts[].Build.AptId")) { throw new ArgumentException("Invalid navigation property path"); }

安全性控制

// 限制可查詢的陣列導覽屬性 var options = new FilterOptions { AllowedFields = new HashSet<string> { "BuildContracts[].Amount", "BuildContracts[].Build.Name", "BuildContracts[].Build.Location", // 不包含敏感資訊如 "BuildContracts[].Build.SecretInfo" } }; var predicate = FilterBuilder.Build<Contract>(filterGroup, options);

21-10. 實務應用場景

電商平台

// 查找包含特定品牌商品的訂單 .ArrayEqual(c => c.OrderItems, oi => oi.Product.Brand, "Apple") .ArrayGreaterThan(c => c.OrderItems, oi => oi.Quantity, 1)

專案管理

// 查找有高優先級任務的專案 .ArrayEqual(c => c.Tasks, t => t.Priority, "High") .ArrayLessThanOrEqual(c => c.Tasks, t => t.CompletionRate, 0.8)

客戶關係管理

// 查找有活躍聯絡人的客戶 .ArrayEqual(c => c.Contacts, ct => ct.Status, "Active") .ArrayContains(c => c.Contacts, ct => ct.Email, "@company.com")

學校管理系統

// 查找有特定課程的學生 .ArrayIn(c => c.Enrollments, e => e.Course.Code, new[] {"CS101", "MATH201"}) .ArrayGreaterThan(c => c.Enrollments, e => e.Grade, 80)

21-11. 除錯與監控

SQL 查詢監控

// 啟用 SQL 日誌以監控生成的查詢 public void ConfigureServices(IServiceCollection services) { services.AddDbContext<ApplicationDbContext>(options => { options.UseSqlServer(connectionString) .EnableSensitiveDataLogging() .LogTo(Console.WriteLine, LogLevel.Information); }); }

查詢效能分析

// 使用 Stopwatch 測量查詢時間 var stopwatch = Stopwatch.StartNew(); var results = _context.Contracts .Include(c => c.BuildContracts) .ThenInclude(bc => bc.Build) .Where(predicate) .ToList(); stopwatch.Stop(); _logger.LogInformation($"Array navigation query took {stopwatch.ElapsedMilliseconds}ms");

21-12. 單元測試範例

[Fact] public void ArrayLike_Should_FindMatchingContracts() { // Arrange using var context = CreateTestContext(); var filterGroup = FilterDictionaryBuilder.QueryBuilder<Contract>() .ArrayLike(c => c.BuildContracts, bc => bc.Build.Name, "豪宅") .ToFilterGroup(); // Act var predicate = FilterBuilder.Build<Contract>(filterGroup); var results = context.Contracts .Include(c => c.BuildContracts) .ThenInclude(bc => bc.Build) .Where(predicate) .ToList(); // Assert results.Should().HaveCount(1); results.Should().Contain(c => c.Name == "豪宅購買合約"); } [Fact] public void ArrayBetween_Should_FilterByRange() { // Arrange using var context = CreateTestContext(); var filterGroup = FilterDictionaryBuilder.QueryBuilder<Contract>() .ArrayBetween(c => c.BuildContracts, bc => bc.Amount, 30000m, 60000m) .ToFilterGroup(); // Act var predicate = FilterBuilder.Build<Contract>(filterGroup); var results = context.Contracts .Include(c => c.BuildContracts) .Where(predicate) .ToList(); // Assert results.Should().NotBeEmpty(); results.SelectMany(c => c.BuildContracts) .Should().OnlyContain(bc => bc.Amount >= 30000m && bc.Amount <= 60000m); }

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