Is there a delegate available for properties in C#?

Question

Given the following class:

class TestClass {
  public void SetValue(int value) { Value = value; }
  public int Value { get; set; }
}

I can

Answer 1

There are three ways of doing this; the first is to use GetGetMethod()/GetSetMethod() and create a delegate with Delegate.CreateDelegate. The second is a lambda (not much use for reflection!) [i.e. x=>x.Foo]. The third is via Expression (.NET 3.5).

The lambda is the easiest ;-p

    class TestClass
    {
        public int Value { get; set; }
    }
    static void Main()
    {
        Func lambdaGet = x => x.Value;
        Action lambdaSet = (x, val) => x.Value = val;

        var prop = typeof(TestClass).GetProperty("Value");
        Func reflGet = (Func) Delegate.CreateDelegate(
            typeof(Func), prop.GetGetMethod());
        Action reflSet = (Action)Delegate.CreateDelegate(
            typeof(Action), prop.GetSetMethod());
    }

To show usage:

        TestClass foo = new TestClass();
        foo.Value = 1;
        Console.WriteLine("Via property: " + foo.Value);

        lambdaSet(foo, 2);
        Console.WriteLine("Via lambda: " + lambdaGet(foo));

        reflSet(foo, 3);
        Console.WriteLine("Via CreateDelegate: " + reflGet(foo));

Note that if you want the delegate pointing to the specific instance, you can use closures for the lambda, or the overload of CreateDelegate that accepts and instance.