Generic Extension Method to Determine if a Value is Contained in a List or Array of Elements
Posted: 7/9/2021 11:11:52 AMBy: PrintableKanjiEmblem
Times Read: 1,237
Likes: 0 Dislikes: 0
Topic: Programming: .NET Framework
Why something like this isn't built into .NET, I have no idea. But several places I've worked at have had variations on this to make development easier. So here's my implementation of it:
using System.Collections.Generic;
using System.Linq;
namespace [ProjectName].ExtensionMethods
{
public static class GenericExtensions
{
///
/// Indicates if the source value is contained in the passed list.
///
/// Source value we are looking for in the list.
/// List of values to search.
/// bool
public static bool IsContainedIn(this T sourceValue, IEnumerable list)
{
return list.Contains(sourceValue);
}
///
/// Indicates if the source value is contained in the passed params.
///
///
/// Source value we are looking for in the list
/// Param array of values to search.
/// bool
public static bool IsContainedIn(this T sourceValue, params T[] list)
{
return list.Contains(sourceValue);
}
}
}
Usage examples:
using ContainedTest.ExtensionMethods; using System; using System.Collections.Generic; namespace ContainedTest { class Program { static void Main() { ExampleWithList(); ExampleWithParams(); Console.Write("Press Enter"); Console.ReadLine(); } private static void ExampleWithList() { var sourceValue = 3; var valueList = new List{ 1, 2, 3, 4, 5, 6, 7, 8 }; Console.WriteLine("Example with List:"); Console.WriteLine($"Is 3 contained in value list: {sourceValue.IsContainedIn(valueList)}"); Console.WriteLine($"Is 22 contained in value list: {22.IsContainedIn(valueList)}"); Console.WriteLine($"Is 3 contained in inline-supplied list: {sourceValue.IsContainedIn(new List { 2, 3, 7, 22 })}"); Console.WriteLine(); } private static void ExampleWithParams() { Console.WriteLine("Example with Params:"); var sourceValue = 3; Console.WriteLine($"Is 3 contained in param array: {sourceValue.IsContainedIn(1, 3, 5, 7, 9)}"); Console.WriteLine($"Is 22 contained in param array: {22.IsContainedIn(1, 3, 5, 7, 9)}"); Console.WriteLine(); } } }
Enjoy!
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