在.NET 3.5中使用WCF DataContractJsonSerializer

Question

I'm trying to use the geocoding code from here in my ASP.NET MVC 2 site. Unfortunately, some of that code, specifically the DataContractJsonSerializer usage, is only possible through .NET 4.0 . As my hosting provider doesn't support .NET 4, I'm forced to implement that functionality in .NET 3.5.

How can I rework the code (which I have reposted below) to work in .NET 3.5?

The Google Maps Geocoding API can also return XML, if that's easier to serialize in 3.5...

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Below is the code I'm trying to convert from .NET 4 to .NET 3.5:

using System;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Json;
using System.Net;
using System.Web;

.
.
.

private static GeoResponse CallGeoWS(string address)
{
        string url = string.Format(
                "http://maps.google.com/maps/api/geocode/json?address={0}&region=dk&sensor=false",
                HttpUtility.UrlEncode(address)
                );
        var request = (HttpWebRequest)HttpWebRequest.Create(url);
        request.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip,deflate");
        request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
        DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(GeoResponse));
        var res = (GeoResponse)serializer.ReadObject(request.GetResponse().GetResponseStream());
        return res;
}

[DataContract]
class GeoResponse
{
        [DataMember(Name="status")]
        public string Status { get; set; }
        [DataMember(Name="results")]
        public CResult[] Results { get; set; }

        [DataContract]
        public class CResult
        {
                [DataMember(Name="geometry")]
                public CGeometry Geometry { get; set; }

                [DataContract]
                public class CGeometry
                {
                        [DataMember(Name="location")]
                        public CLocation Location { get; set; }

                        [DataContract]
                        public class CLocation
                        {
                                [DataMember(Name="lat")]
                                public double Lat { get; set; }
                                [DataMember(Name = "lng")]
                                public double Lng { get; set; }
                        }
                }
        }
}

Answer 1

What is the specific problem that you're hitting?

Without more details it's difficult to diagnose the exact problem, but DataContractJsonSerializer is available in .NET 3.5 - you'll need to manually add a reference to System.ServiceModel.Web.dll .

(Note that the MSDN documentation misleadingly states that DataContractJsonSerializer can be found in System.Runtime.Serialization.dll . While this is true for .NET 4, the .NET 3.5 version of DataContractJsonSerializer actually lives in System.ServiceModel.Web.dll .)