Can_use_TypeConverter_to_handle_simple_values

gistfile1.cs

    // based on http://www.asp.net/web-api/overview/formats-and-model-binding/parameter-binding-in-aspnet-web-api
    // and http://blogs.msdn.com/b/jmstall/archive/2012/04/20/how-to-bind-to-custom-objects-in-action-signatures-in-mvc-webapi.aspx
    public class Can_use_TypeConverter_to_handle_simple_values
    {
        [TypeConverter(typeof(LocationTypeConverter))]
        public class Location
        {
            public double Latitude { get; set; }
            public double Longitude { get; set; }

            public static Location TryParse(string input)
            {
                var parts = input.Split(',');
                if (parts.Length != 2)
                {
                    return null;
                }

                int x, y;
                if (int.TryParse(parts[0], out x) && int.TryParse(parts[1], out y))
                {
                    return new Location { Latitude = x, Longitude = y };
                }

                return null;
            }

            public override string ToString()
            {
                return string.Format("{0},{1}", Latitude, Longitude);
            }
        }
        public class ResourceController : ApiController
        {
            public async Task<HttpResponseMessage> Get(int id, Location location)
            {
                Assert.Equal(123, id);
                Assert.NotNull(location);
                Assert.Equal(1, location.Latitude);
                Assert.Equal(2, location.Longitude);

                return new HttpResponseMessage()
                {
                    Content =
                        new StringContent(Url.Link("ApiDefault",
                            new
                            {
                                controller = "resource",
                                id = 123,
                                location = new Location {Latitude = 3, Longitude = 4}
                            }))
                };
            }
        }

        [Fact]
        public async Task Run()
        {
            var client = new TestConfig<ResourceController>().GetClient();
            client.DefaultRequestHeaders.Host = "example.net";
            var res = await client.GetAsync("http://example.net/resource/123?location=1,2");
            Assert.Equal(HttpStatusCode.OK, res.StatusCode);
            var url = await res.Content.ReadAsStringAsync();
            Assert.Equal("http://example.net/resource/123?location=3%2C4", url);
        }

        public class LocationTypeConverter : TypeConverter
        {
            public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
            {
                if (sourceType == typeof(string))
                {
                    return true;
                }
                return base.CanConvertFrom(context, sourceType);
            }

            public override object ConvertFrom(ITypeDescriptorContext context,
               CultureInfo culture, object value)
            {
                if (value is string)
                {
                    return Location.TryParse((string)value);
                }

                return base.ConvertFrom(context, culture, value);
            }
        }
    }