JJ.Framework.Common.Legacy

A mixed bag of general-purpose utilities with minimal dependencies. Later versions of this library split functionality into focused packages like JJ.Framework.Text, JJ.Framework.Collections, and JJ.Framework.Exceptions. This "prequel" version contains a little bit of everything: a version released in aid of releasing older legacy apps, still holding value. Now targets .NET 10 and .NET Standard for wide compatibility and tested with 💯% code coverage.

Contents

• String Extensions
• Collection Extensions
• Recursive Collection Extensions
• KeyValuePairHelper
• Exception Types
• Misc Helpers

String Extensions

• Left / Right

  • Return the left or right part of a string:
  • "12345".Left(2) = "12"
  • "12345".Right(2) = "45"
  • (Throws exception if string shorter than requested length.)

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• FromTill

  • Take the middle of a string by start/end index (zero‑based, inclusive)
  • "12345".FromTill(2, 3) = "34"
  • (Throws exception if indexes out of range.)

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• CutLeft / CutRight

  • Trim at most one occurrence of a value from the given string:
  • "BlaLala".CutLeft("Bla") = "Lala"
  • "12345".CutRight(2) = "123"

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• CutLeftUntil / CutRightUntil

  • Remove text until the delimiter, keeping the delimiter:
  • "Path/to/file.txt".CutRightUntil("/") = "Path/to/"
  • "Hello world!".CutLeftUntil("world") = "world!"

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• StartWithCap / StartWithLowerCase

  • Change just the first character's case:
  • "test".StartWithCap() = "Test"
  • "TEST".StartWithLowerCase() = "tEST"

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• Split

  • Adds overloads missing until .NET 5 and a params variant for delimiters:
  • "apple-banana|cherry".Split("-", "|") = [ "apple", "banana", "cherry" ]

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• SplitWithQuotation

  • Parse CSV-like lines honoring quotes to allow use of separator and quote characters within the values themselves:
  • "apple|~banana|split~|cherry".SplitWithQuotation("|", '~') = [ "apple", "banana|split", "cherry" ]

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• RemoveExcessiveWhiteSpace

  • Trim and replace sequences of two or more white space characters by a single space:
  • " This is a test. ".RemoveExcessiveWhiteSpace() = "This is a test."

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• Replace

  • String.Replace variant with optional case-insensitive match:
  • "HelloWORLD".Replace("world", "Universe", ignoreCase: true ) = "HelloUniverse"

Collection Extensions

• Distinct

  • Variation that takes a key selector that determines what makes an item unique, e.g.
  • myItems.Distinct(x => x.LastName);
  • For multi-part as keys, use:
  • myItems.Distinct(x => new { x.FirstName, x.LastName });

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• Except

  • Variations with:
  • A single item, e.g. myCollection.Except(myItem);
  • The choice to keep duplicates. (The original Except method from .NET automatically does a distinct, which is something you do not always want.)

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• Union

  • Variations with:
  • A single item, e.g. myCollection.Union(myItem);
  • Starts with a single item and then adds a collection to it e.g. myItem.Union(myCollection);

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• Add

  • Add multiple items to a collection by means of a comma separated argument list, e.g. myCollection.Add(1, 5, 12);

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• AddRange

  • AddRange is a member of List<T>. Here is a variation for IList<T> to support more collection types.

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• ForEach

  • Not all collection types have the ForEach method. Here you have an overload for IEnumerable<T> so you can use it for more collection types.

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• AsEnumerable
  • Converts a single item to a enumerable, so you can for instance use it with LINQ:
  • IEnumerable<int> myInts = 3.AsEnumerable();

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• TrimAll

  • Trims all the strings in the collection:
  • string[] trimmedTexts = myTexts.TrimAll()

Recursive Collection Extensions

LINQ methods already allow you to process a whole collection of items in one blow. Process a whole tree of items in one blow? For many cases these Recursive Collection Extensions offer a one-line solution.

This line of code:

var allItems = myRootItems.UnionRecursive(x => x.Children);

Gives you a list of all the nodes in a tree structure like the following:

var root = new Item { Children = new[] { new Item() new Item { Children = new[] { new Item() } }, new Item { Children = new[] { new Item(), new Item(), } }, } };

There is also a SelectRecursive method:

var allItemsExceptRoots = myRootItems.SelectRecursive(x => x.Children);

The difference with UnionRecursive is that SelectRecursive does not include the roots in the result collection.

KeyValuePairHelper

Converts a single array to KeyValuePair or Dictionary, where the 1st item is a name, the 2nd a value, the 3rd a name, the 4th a value, etc. This can be useful to be able to specify name/value pairs as params (variable amount of arguments). For instance:

void MyMethod(params object[] namesAndValues) { var dictionary = KeyValuePairHelper.ConvertNamesAndValuesListToDictionary(namesAndValues); ... }

Calling MyMethod looks like this:

MyMethod("Name1", 3, "Name2", 5, "Name3", 6);

Exception Types

2 exception types with subtle differences:

• InvalidValueException

  • With messages like:
    Invalid CustomerType value: 'Undefined'.
    when you throw:
    throw new InvalidValueException(CustomerType.Undefined)

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• ValueNotSupportedException

  • With messages like:
    CustomerType value: 'Subscriber' is not supported.
    when you throw:
    throw new ValueNotSupportedException(CustomerType.Subscriber)

Misc Helpers

• EmbeddedResourceHelper

  • Make it a little easier to get embedded resource Streams, bytes and strings.

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• CultureHelper

  • To set thread culture with a single code line.

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• ConfigurationHelper

  • Legacy helper for using configuration settings on platforms where System.Configuration was not available.

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• KeyHelper

  • Utility to produce keys for use in Dictionaries by concatenating values with a GUID separator in between.

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