How to find out if a property is an auto-implemented property with reflection?

Question

So in my case i am doing discovery of the structure of a class using reflection. I need to be able to find out if a property is an auto-implemented property by the PropertyInfo object. I assume that the reflection API does not expose such functionality because auto-properties are C# dependent, but is there any workaround to get this information?

Answer 1

You could check to see if the get or set method is marked with the CompilerGenerated attribute. You could then combine that with looking for a private field that is marked with the CompilerGenerated attribute containing the name of the property and the string "BackingField".

Perhaps:

public static bool MightBeCouldBeMaybeAutoGeneratedInstanceProperty(
    this PropertyInfo info
) {
    bool mightBe = info.GetGetMethod()
                       .GetCustomAttributes(
                           typeof(CompilerGeneratedAttribute),
                           true
                       )
                       .Any();
    if (!mightBe) {
        return false;
    }


    bool maybe = info.DeclaringType
                     .GetFields(BindingFlags.NonPublic | BindingFlags.Instance)
                     .Where(f => f.Name.Contains(info.Name))
                     .Where(f => f.Name.Contains("BackingField"))
                     .Where(
                         f => f.GetCustomAttributes(
                             typeof(CompilerGeneratedAttribute),
                             true
                         ).Any()
                     )
                     .Any();

        return maybe;
    }

It's not fool proof, quite brittle and probably not portable to, say, Mono.