Has String.Intern had the value?

问题

String.Intern has a special pool for strings which can later be retrieved.

Is there any way for me to know that the specified string was taken from the pool , and was NOt newly created ? example :

string s1 = "MyTest"; 
string s2 = new StringBuilder().Append("My").Append("Test").ToString(); 
string s3 = String.Intern(s2); 
Console.WriteLine((Object)s2==(Object)s1); // Different references.
Console.WriteLine((Object)s3==(Object)s1); // The same reference.

s3 ref val was taken from the pool

is there any way for me to know it ?

回答1:

You might have some luck with the IsInterned method, it returns null if the string wasn't interned, and returns a reference if it was taken from the pool. However, this behaviour will depend on the runtime, and might not yield what you expect.

回答2:

I think that IsInterned method could help you: http://msdn.microsoft.com/en-us/library/system.string.isinterned.aspx

回答3:

Yes, use String.IsInterned().

See the MSDN page.

来源：https://stackoverflow.com/questions/8688300/has-string-intern-had-the-value