Cannot use ref or out parameter in lambda expressions

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Why can’t you use a ref or out parameter in a lambda expression?

I came across the error today and found a workaround but I was still curious why this is a compile-time error.

CS1628: Cannot use in ref or out parameter ‘parameter’ inside an anonymous method, lambda expression, or query expression

Here’s a simple example:

private void Foo()
{
    int value;
    Bar(out value);
}

private void Bar(out int value)
{
    value = 3;
    int[] array = { 1, 2, 3, 4, 5 };
    int newValue = array.Where(a => a == value).First();
}

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