How Can C# Extension Methods Improve Code Readability and Reliability?

C#extension method: Practical example set brocade

The expansion method in

C#is a powerful function that allows developers to add new functions to the existing type without modifying the original type. This is very useful for adding common operations to the types that do not support certain operations, or custom types of customization for specific scenes.

A common example of the expansion method is to add the operator to the type of

operator that does not support In operational symbols. This computing character can be used to check whether the value is included in the specified value list.

The following is an extension method for adding int operators to In type:

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

This method can be used to replace the lengthy and duplicated if statement with more concise and easy -to -read expressions:

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

// 使用扩展方法的代码
if(reallyLongIntegerVariableName.In(1,6,9,11))
{
  // 执行某些操作...
}</code>

The extension method can also be used to add other commonly used operations to the type. For example, the following expansion methods add ThrowIfArgumentIsNull method to object type:

<code class="language-csharp">public static void ThrowIfArgumentIsNull<T>(this T source, string argumentName)
{
  if(source == null)
  {
    throw new ArgumentNullException(argumentName);
  }
}</code>

This method can be used to ensure that the parameters passed to the method are not empty, which helps to prevent errors and improve code reliability.

Extension method is a valuable tool for extending the existing types of functions in the extension. By adding custom methods, developers can improve the availability and maintenance of code.

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