Is there some trick to use 'out' parameters inside lambda function? [duplicate]

Question

if ( (new Func</*out*/ string, bool>( (/*out*/ string uname) => ....

more details : that is a part of login function and I just want that my lambda function to changes login-name user with a out parameter and said me that user logined with it's bool return.

I really understand that I can return the Tuple and then get my string value but I want exactly out parameter for some personal clarity. I better return only string with null if user is not login, just want to know if I can use out parameters inside lambda functions.

And I really get that the code with expressions on the statement places is not so clean But none said me if that is really bad for compiler.

Answer 1

Lambda expressions won't work, but for delegates you should be fine using a statement body:

bool outval = false; // definite assignment
Func<bool> func = () => {
    return SomeMethod(out foo);
};
bool returned = func();
// check both outval and returned

For delegates... You will need to define your own:

public delegate bool MyType(out string value);