C# Tip Article

C# 7.0 introduced "ref return" which allows a method to return "ref" of a value.
Some online articles have wrong examples, which made me to run into "Cannot initialize a by-reference variable with a value" error.

For example, here is a method using ref return and the method call statement.

// ref return method
public ref int GetScore(int id)
{
	//...

	return ref scores[id];
}

// wrong method call
ref int s = g.GetScore(1);

This caused "Cannot initialize a by-reference variable with a value" error.

The correct syntax is to add ref in front of GetScore() method call. That is,

// correct method call
ref int s = ref g.GetScore(1);