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c#refoutpartial-methods
Tony
Tony

Reputation: 1207

Partial Methods in C# and parameters

Ref and out can change the behavior of function parameters. Sometimes we want the actual value of a variable to be copied as the parameter. Other times we want a reference. These modifiers affect definite assignment analysis.

My question is: can partial methods in C# have ref, out, optional input parameters?

Upvotes: -6

Views: 817

Answers (1)

Felipe
Felipe

Reputation: 11959

By experimentation with the code in this example it seems like you can find that it is possible to use ref, params, and default argument values, but not out

partial class A
{
    partial void OnSomethingHappened(string s);
    partial void useRef(ref string s);
    partial void useOpt(string s1, string s2 = null);
    partial void useArgs(params string [] s);
}

// This part can be in a separate file.
partial class A
{
    // Comment out this method and the program
    // will still compile.
    partial void OnSomethingHappened(String s)
    {
        Console.WriteLine("Something happened: {0}", s);
    }
}

Also, as explained by the docs linked by @user6144226 and pointed out by @marc_s:

Partial methods can have ref but not out parameters.

Upvotes: 1

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