I ran into a nasty bug recently and the simplified code looks like below:

int x = 0;
x += Increment(ref x);

...

private int Increment(ref int parameter) {
    parameter += 1;
    return 1;
}

The value of x after the Increment call is 1! This was an easy fix once I found out what was happening. I assigned the return value to a temporary variable and then updated x. I was wondering what explains this issue. Is it something in the spec or some aspect of C# that I'm overlooking.

c# .net ref-parameters
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