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POHow do DataContracts work? - Deserialize Json
 

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  1. POHow do DataContracts work? - Deserialize Json
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    <p>I grabbed an example off of <a href="https://stackoverflow.com/questions/4115037/problem-with-deserializing-json-on-datamember-type/4119681#4119681">this SO question</a>, and built my own custom Google Maps object used for deserializing the json object.</p> <p>Now the code works like a champ, but I just need an explanation on why/how it works. Does the serializer "try" to match up names, or is something else going on.</p> <p><strong>What exactly is this doing?</strong></p> <p>Here's the <strong>working</strong> code.</p> <pre><code>Imports System.Net Imports System.Web Imports System.Runtime.Serialization Imports System.Runtime.Serialization.Json Imports System.Web.Script.Serialization Namespace Utilities.Apis Public NotInheritable Class GoogleGeolocate Private Const googleUrl As String = "http://maps.googleapis.com/maps/api/geocode/json?address={0}&amp;sensor=false" Private Sub New() End Sub Public Shared Function GetLatLon(ByVal address As String) As String ''# This is just here to prevent "placeholder" data from being submitted. If address = "6789 university drive" Then Return Nothing End If address = HttpUtility.UrlEncode(address) Dim url = String.Format(googleUrl, address) Dim request = DirectCast(HttpWebRequest.Create(url), HttpWebRequest) request.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip,deflate") request.AutomaticDecompression = DecompressionMethods.GZip Or DecompressionMethods.Deflate Dim serializer As New DataContractJsonSerializer(GetType(GoogleResponse)) Dim res = DirectCast(serializer.ReadObject(request.GetResponse().GetResponseStream()), GoogleResponse) Dim resources As GoogleResponse.Result = res.results(0) Dim point = resources.geometry.location.lat Dim latlon As New GeolocationLatLon With latlon .latitude = resources.geometry.location.lat .longitude = resources.geometry.location.lng End With Dim jsonSerializer = New JavaScriptSerializer Return jsonSerializer.Serialize(latlon) End Function End Class &lt;DataContract()&gt; Public Class GoogleResponse &lt;DataMember()&gt; Public Property results() As Result() &lt;DataContract()&gt; Public Class Result &lt;DataMember()&gt; Public Property geometry As m_Geometry &lt;DataContract()&gt; Public Class m_Geometry &lt;DataMember()&gt; Public Property location As m_location &lt;DataContract()&gt; Public Class m_location &lt;DataMember()&gt; Public Property lat As String &lt;DataMember()&gt; Public Property lng As String End Class End Class End Class End Class End Namespace </code></pre> <p>And here's the GeolocationLatLon Poco</p> <pre><code>Public Class GeolocationLatLon Public latitude As String Public longitude As String End Class </code></pre> <p>When I call the code, it's really quite simple.<br> <em>note, this is an MVC controller, that has nothing to do "really" with the question other than to show what I'm doing</em></p> <pre><code> Function GeoLocation(ByVal address As String) As ContentResult Return New ContentResult With {.Content = GoogleGeolocate.GetLatLon(address), .ContentType = "application/json"} End Function </code></pre> <p>And the final result is</p> <blockquote> <p>{"latitude":"50.124300","longitude":"-114.4979990"}</p> </blockquote>
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