How does "TypeDescriptor" work?

you should modify your codes as below:

 class My
        {

        }
         // You should add the below line
        [TypeConverter(typeof(MyConverter))]
        class MyConverter : TypeConverter
        {
            public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
            {
                return sourceType == typeof(string);
            }
        }
        class Program
        {
            static void Main(string[] args)
            {
                // Because your MyConverter inherits from TypeConverter
                Console.WriteLine(TypeDescriptor.GetConverter(typeof(MyConverter)).CanConvertFrom(typeof(string)));
                Console.Read();
            }
        }

The above codes print "True".

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