C# String IsInterned

Description

String IsInterned retrieves a reference to a specified String.

Syntax

String.IsInterned has the following syntax.


public static string IsInterned(
  string str
)

Parameters

String.IsInterned has the following parameters.

str - The string to search for in the intern pool.

Returns

String.IsInterned method returns A reference to str if it is in the common language runtime intern pool; otherwise, null.

Example

To get a Boolean value that indicates whether a particular string is interned, you can use code such as the following.


//from w w  w .  jav  a  2  s.  c  o m
using System;

public class Example
{
   public static void Main()
   {
      string str1 = "a";
      string str2 = str1 + "b";
      string str3 = str2 + "c";
      string[] strings = { "value", "part1" + "_" + "part2", str3, 
                           String.Empty, null };
      foreach (var value in strings) {
         if (value == null) continue;

         bool interned = String.IsInterned(value) != null;
         if (interned)
            Console.WriteLine("'{0}' is in the string intern pool.", value);
         else
            Console.WriteLine("'{0}' is not in the string intern pool.",value);                      
      }
   }
}

The code above generates the following result.