MemoryLeakDetector.Analyzers

Roslyn analyzers for detecting memory leaks and performance issues in .NET code.

Installation

dotnet add package MemoryLeakDetector.Analyzers

What It Detects?

🟢 Memory Leak Warnings (Green Squiggle)

Rule	Description
MLD001	HttpClient created per request (causes socket exhaustion)
MLD002	Class has disposable field but doesn't implement IDisposable
MLD003	Async void method (exceptions cannot be caught)
MLD004	Timer field without IDisposable implementation

⚪ Performance Suggestions (Gray Dots)

Rule	Description
PERF001	String concatenation in loop (use StringBuilder)
PERF002	ContainsKey + indexer (use TryGetValue)
PERF003	ToLower/ToUpper for comparison (use StringComparison)

Examples

MLD001 - HttpClient per request

// ❌ Bad - creates socket exhaustion public async Task<string> GetData() { var client = new HttpClient(); // Warning: MLD001 return await client.GetStringAsync(url); } // ✅ Good - reuse HttpClient private static readonly HttpClient _client = new HttpClient(); public async Task<string> GetData() { return await _client.GetStringAsync(url); }

MLD002 - Missing IDisposable

// ❌ Bad - FileStream not disposed public class MyService { private FileStream _file; // Warning: MLD002 } // ✅ Good - implements IDisposable public class MyService : IDisposable { private FileStream _file; public void Dispose() => _file?.Dispose(); }

PERF001 - String concat in loop

// ❌ Bad - creates many temporary strings var result = ""; foreach (var item in items) { result += item; // Info: PERF001 } // ✅ Good - use StringBuilder var sb = new StringBuilder(); foreach (var item in items) { sb.Append(item); }