Detailed explanation of how to add String type C#

namespace MyExtensionMethods 
{ 
  public static class MyExtensions 
  { 
    public static int MyGetLength(this  target) 
    { 
      return ; 
    } 
  } 
} 

When using it, you need to introduce this namespace, which is quoted as follows:

string str = "dafasdf"; 
int len = (); 

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