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What is “where T: class” in C # common methods?

What is the difference between these method signatures?

public void T MyMethod<T>(T parameter)

and

 public void T MyMethod<T>(T parameter) where T : class

They seem to have the same result ... so what does where T : class do?

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4 answers

In the second method, T can only be a class and cannot be a structural type.

See Type Parameter Limitations (C # Programming Guide) :

where T: class

Type must be a reference type [class]; this also applies to any class, interface, delegation, or array type.

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in the first case, you can call it using a non ref type, for example

 MyMethod<int>(10);

which will not work with the second version, since it only accepts link types!

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no difference, but T is limited to a reference type. they differ only in compiletime, since the compiler checks that T is a ref type or not.

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  • Both will not compile. You must use either void or T
  • And the second method will not work for MyMethod(1) , because it requires a reference type T
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Source: https://habr.com/ru/post/1400883/

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