private static void TestMyStruct()
{
Console.WriteLine(MethodBase.GetCurrentMethod().Name);
MyStruct foo = new MyStruct();
var resA1 = foo.GetAnnotation <MyStruct>();
var resA2 = foo.GetAnnotation <MyStruct>(nameof(MyStruct.MyString));
var resA3 = foo.GetAnnotation <MyStruct>("MyField");
Console.WriteLine($"{nameof(resA1)}: {resA1}");
Console.WriteLine($"{nameof(resA2)}: {resA2}");
Console.WriteLine($"{nameof(resA3)}: {resA3}");
foo = new MyStruct();
var resB1 = foo.GetAnnotation <MyStruct>();
var resB2 = foo.GetAnnotation <MyStruct>(nameof(MyStruct.MyString));
var resB3 = foo.GetAnnotation <MyStruct>("MyField");
Console.WriteLine($"{nameof(resB1)}: {resB1}");
Console.WriteLine($"{nameof(resB2)}: {resB2}");
Console.WriteLine($"{nameof(resB3)}: {resB3}");
var resC1 = typeof(MyStruct).GetAnnotation();
var resC2 = foo.GetType().GetAnnotation();
var resC3 = typeof(MyStruct).GetAnnotation("MyString");
var resC4 = foo.GetType().GetAnnotation("MyString");
Console.WriteLine($"{nameof(resC1)}: {resC1}");
Console.WriteLine($"{nameof(resC2)}: {resC2}");
Console.WriteLine($"{nameof(resC3)}: {resC3}");
Console.WriteLine($"{nameof(resC4)}: {resC4}");
}