How Can C# Extension Methods Simplify Value Checks in Arrays and Lists?

ExtensionOverflow: a collection of excellent C# extension methods

Extension methods enhance the functionality of C#, allowing new functionality to be added without modifying the source code of existing classes. The ExtensionOverflow project on Codeplex invites developers to contribute their favorite extension methods.

A noteworthy contribution: the 'In' method

A prominent contribution from the ExtensionOverflow project is the 'In' extension method, which simplifies the task of checking whether a value exists in an array or list.

<code class="language-csharp">public static bool In<T>(this T source, params T[] list)
{
  if(source == null) throw new ArgumentNullException(nameof(source));
  return list.Contains(source);
}</code>

Usage:

This method can replace lengthy switch-case statements or if-else branches for checking whether a value exists in a collection. For example:

Original code:

<code class="language-csharp">if(reallyLongIntegerVariableName == 1 || 
    reallyLongIntegerVariableName == 6 || 
    reallyLongIntegerVariableName == 9 || 
    reallyLongIntegerVariableName == 11)
{
  // 执行某些操作...
}</code>

Code after using the 'In' method:

<code class="language-csharp">if(reallyLongIntegerVariableName.In(1, 6, 9, 11))
{
  // 执行某些操作...
}</code>

The 'In' method simplifies the code and reduces code length by eliminating the need for multiple comparisons. It also allows for cleaner, more maintainable code to be written, making it easier to determine what value is being checked.

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