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.NET Forum / .NET Framework / New Users / April 2006ByRef
How do I pass a variable ByRef in C#?  SignatureArne Garvander Certified Geek > How do I pass a variable ByRef in C#? ref as in: void MyMethod(ref int x) { x = 42; } -- Barry > How do I pass a variable ByRef in C#? Using the "ref" modifier. Note that it's rarely necessary, as reference type values are already references. (Those references are passed by value, however.) See http://www.pobox.com/~skeet/csharp/parameters.html for more information. SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet If replying to the group, please do not mail me too Is a reference type value the same as an object? SignatureArne Garvander (I program VB.Net for fun and C# to get paid.) > > How do I pass a variable ByRef in C#? > [quoted text clipped - 4 lines] > See http://www.pobox.com/~skeet/csharp/parameters.html for more > information. > Is a reference type value the same as an object? I expressed myself badly. When you have a variable whose type is a reference type, the value of that variable is a reference. It's not the object itself, it's a reference to the object. Suppose you had: string x = "some very long string indeed which would be large etc"; then the value of x is just a reference - 4 or 8 bytes depending on your platform. When you use x as an argument to a method, only 4 (or 8) bytes are copied - the reference. The object itself is on the heap, and the new copy of the reference points to the same object as the "old" reference. SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet If replying to the group, please do not mail me too > Is a reference type value the same as an object? Yes, anything declared with the 'class' keyword in C#. -- Barry
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