public void CanConvertFrom()
 {
     Assert.IsTrue(converter.CanConvertFrom(typeof(string)), "#A1");
     Assert.IsFalse(converter.CanConvertFrom(typeof(DateTime)), "#A2");
     Assert.IsFalse(converter.CanConvertFrom(typeof(DateTimeOffset)), "#A3");
     Assert.IsFalse(converter.CanConvertFrom(typeof(object)), "#A4");
     Assert.IsTrue(converter.CanConvertFrom(typeof(InstanceDescriptor)), "#A5");
 }