Lambda without nonlocal dependencies is not static

Question

I am running Visual Studio 2015 Enterprise, .NET 4.6, and I wrote some code that relies on Delegates being static. I ran the exact code from this question, but I get "false":

static void Main(string[] args)
{
    Action<string> actionMethod = s => { Console.WriteLine("My Name is " + s); };

    // Always false
    Console.WriteLine(actionMethod.Method.IsStatic);

    Console.Read();
}

Is this a bug? Or does C# not guarantee that lambdas without nonlocal dependencies are made static?

Is there a workaround to determine if a lambda/delegate has nonlocal dependencies? My goal is to know if a lambda caught it's enclosing variables / uses a closure.

See Delegate caching behavior changes in Roslyn for an explanation as to why this change was made. — Mike Zboray
– Mike Zboray, Commented Jan 26, 2016 at 16:56

Servy · Accepted Answer · 2016-01-26 16:49:51Z

2

Or does C# not guarantee that lambdas without nonlocal dependencies are made static?

It makes no such guarantee. That was an implementation detail of some versions of the compiler; one that it has no obligation to continue with going forward. As you have seen, they've changed that implementation detail.

answered Jan 26, 2016 at 16:49

Servy

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