爲webHttpBinding創建異步代理類JSON web服務

Question

我無法在Silverlight中使用webhttpbinding，因此我無法將服務引用添加到我的REST wcf服務並獲得visual studio生成代理類，因此我必須創建我的自己，我想知道如何創建我自己的異步REST代理類以使用Silverlight使用類似WebClient的東西？

下面是我創建的一些代碼，它實現了一個代理類，我是否正確地編碼它？

public class RestProxy 
{ 
    private const string REST_URL = "http://.../RestService.svc"; 

    private delegate int AddDelegate(int num1, int num2); 
    private delegate void AddCompleted(int result); 
    public AddCompleted AddOnCompleted { get; set;} 

    public int Add(int num1, int num2) 
    { 
     const string rest_method = "/Add"; 

     //create json serializer. 
     JavaScriptSerializer serializer = new JavaScriptSerializer(); 

     //add parameters to send into dictionary. 
     Dictionary<string, string> numberData = new Dictionary<string, string>(); 
     postData.add("number1", num1.toString()); 
     postData.add("number2", num2.toString()); 

     //serialize dictionary to json. 
     string jsonData = serializer.Serialize(numberData); 

     //make request 
     string responseData = MakeRequest(REST_URL + rest_method, jsonData); 

     //deserialize json response data to dictionary. 
     Dictionary<string, string> numberResult = (Dictionary<string,string>)serializer.Deserialize(responseData, typeof(Dictionary<string,string>)); 

     return Convert.toInt32(numberResult["AddResult"]); 

    } 

    public void AddAsync(int num1, int num2) 
    { 
     AddDelegate addAsync = new AddDelegate(this.Add); 

     addAsync.BeginInvoke(int num1, int num2, (IAsyncResult async_result) => { 
      //get caller 
      AsyncResult result = (AsyncResult)async_result; 
      AddDelegate caller = (AddDelegate)result.AsyncDelegate; 

      //get result. 
      int resultNumber = caller.EndInvoke(result); 

      //call callback delegates. 
      if(AddOnCompleted != null) AddOnCompleted(resultNumber); 
     }, null); 
    } 

    protected string MakeRequest(string address, string data_to_send) 
    { 
     WebClient webclient = new WebClient(); 
     byte[] responseBytes = webclient.UploadData(new Uri(address), "POST", Encoding.ASCII.GetBytes(data_to_send)); 
     return Encoding.ASCII.GetString(responseBytes); 
    } 

    public static void Main(string[] args) 
    { 
     RestProxy proxy = new RestProxy(); 
     proxy.AddOnCompleted += new AddOnCompleted((int result) => { Console.WriteLine(result)}); 
     proxy.AddAsync(10, 10); 
    } 
} 

Answer 1

我現在使用RestSharp與我的WP7應用程序，它運作良好。這也意味着我不是在處理所有的管道工作。

舉個例子這裏是一個簡單的包裝類，我用（網址是一個靜態字符串屬性）：

public static void CallMethod<T>(string endPoint, Method method, Dictionary<string, object> parameters, Action<RestResponse<T>> callback) where T : new() 
    { 
     if (string.IsNullOrWhiteSpace(url)) 
      url = Settings.GetSetting("url"); 
     var client = new RestClient(url); 
     var request = new RestRequest(endPoint, method); 
     if (parameters == null) parameters = new Dictionary<string, object>(); 
     foreach (var parameter in parameters) 
     { 
      request.AddParameter(parameter.Key, parameter.Value); 
     } 
     client.ExecuteAsync(request, callback); 
    } 

和樣品呼叫：

private void MakeACall(int someValue) 
    { 
     var parameters = new Dictionary<string, object> { { "paramOne", someValue }, { "paramTwo", SomeLocalMethod()} }; 
     RestAPI.CallMethod<GroupDto>("/Service/Operation", Method.POST, parameters, CallbackMethod); 
    } 

    private void CallbackMethod(RestResponse<GroupDto> response) 
    { 
     if (response.StatusCode != HttpStatusCode.OK) 
      return; 
     ...