What’s the C# syntax for applying an attribute to a return type ?

[return: SomeAttribute()]
public string GatValue()
{
    return"Some Value";
}

Here’s a simple example of a custom attribute used for return types

[AttributeUsage(AttributeTargets.ReturnValue, AllowMultiple = false)]
class MyAttribute : Attribute
{
   public string Description { get; set; }
}

public class SomeClass
{
   [return: MyAttribute(Description = "A Return Value")]
   public string GetValue()
   {
      return "Hello World";
   }
}

class Program
{
   static void Main(string[] args)
   {
      object[] attributes = typeof (SomeClass).
                  GetMethod("GetValue").
                  ReturnTypeCustomAttributes.
                  GetCustomAttributes(false);
   }
}

This will return a single item in the object[] of type MyAttribute.