Silverlight 4.0：使用对.Net 4 Webservice的WebClient UploadStringAsync POST请求

问题描述

|| 我正在尝试运行以下代码： Silverlight应用程序xaml.cs：

private void SavePoiRequest(Mypushpin pin)
    {
        WebClient wc = new WebClient();
        wc.Headers[\"Content-Type\"] = \"application/x-www-form-urlencoded\";
        wc.Encoding = Encoding.UTF8;
        wc.UploadStringCompleted += new UploadStringCompletedEventHandler((sender,e) =>
        {
            if (e.Error != null)
            {
                return;
            }
            AddresstextBox.Text = e.Result;
        });
        String name = pin.Name;
        String lat  = pin.Location.Latitude.ToString().Replace(\",\",\".\");
        String lng  = pin.Location.Longitude.ToString().Replace(\",\".\");
        String address = pin.Address;
        String photodesc = pin.PhotoDesc;
        String poistory = pin.Tag.ToString();
        StringBuilder sr = new StringBuilder();
        sr.Append(\"createpoi?name=\"+name+ \"&lat=\" + lat + \"&lng=\" + lng + \"&adr=\" + address     + \"&desc=\" + photodesc + \"&story=\" + poistory);
        String parameter = sr.ToString();
        wc.UploadStringAsync(new Uri(\"http://localhost:80/\"),\"POST\",parameter);
        AddresstextBox.Text = parameter;
    }

Web服务CS：

[WebInvoke(UriTemplate = \"createpoi?name={name}&lat={latitude}&lng={longitude}&adr={address}&desc={photodescription}&story={poistory}\",Method = \"POST\")]
    public String SetPoiPOST(string name,string latitude,string longitude,string address,string photodescription,string poistory)
    {
        int newid = -1;
        POI_Man poimanager = new POI_Man();
        MemoryStream resultstream = new MemoryStream();

        if (!string.IsNullOrEmpty(name) &&
            !string.IsNullOrEmpty(latitude) &&
            !string.IsNullOrEmpty(longitude) &&
            !string.IsNullOrEmpty(address) &&                
            !string.IsNullOrEmpty(photodescription) &&
            !string.IsNullOrEmpty(poistory)
            )
        {
            //newid = poimanager.CreatePOI_alt(address,name,photodescription,poistory);
            newid = poimanager.CreatePOI(name,latitude,longitude,address,poistory);
            poimanager.Generate(\"xml\");
            resultstream = poimanager.WriteMessage(newid.ToString());
            WebOperationContext.Current.OutgoingResponse.ContentType = \"text/plain\";
        }

        if (poimanager.NoError)
        {
            resultstream = poimanager.WriteMessage(newid.ToString());
            WebOperationContext.Current.OutgoingResponse.ContentType = \"text/plain\";
            //resultstream = (this.GetPoi(newid.ToString()) as MemoryStream);
        }
        else
        {
            resultstream = poimanager.WriteMessage(\"Beim anlegen des POI ist ein Fehler aufgetreten.\"
                + Environment.NewLine + \"Haben Sie einen Parameter vergessen?\");
            WebOperationContext.Current.OutgoingResponse.ContentType = \"text/plain\";

        }
        return newid.ToString();
    }

Web服务无法从客户端获得任何信息。难道我做错了什么？ 我可以通过WebClient OpenWriteAsync通过POST请求与服务器联系。但是我需要服务器对lastID的响应，因此我改用UploadStringAsync。 请你帮助我好吗？ 再见 洲     

解决方法

        尝试wc.UploadStringAsync（new Uri（\“ http：// localhost：80 / createpoi \”），\“ POST \”，参数），并记住对参数进行urlencode     ,        thx的意见！我现在知道REST服务的工作方式。它仅读取URL，而不读取UploadStringAsync（）函数的参数。 因此，我重写了代码，它的工作原理就像一个魅力。

private void SavePoiRequest(MyPushpin pin)
    {
        WebClient wc = new WebClient();
        wc.Headers[\"Content-Type\"] = \"application/x-www-form-urlencoded\";
        wc.Encoding = Encoding.UTF8;
        wc.UploadStringCompleted += new UploadStringCompletedEventHandler((sender,e) =>
        {
            if (e.Error != null)
            {
                return;
            }
            lastID = int.Parse(e.Result);
        });
        Uri baseAddressUri = new Uri(\"http://localhost:80/\");
        UriTemplate uriTemplate = new UriTemplate(\"createpoi?name={name}&lat={latitude}&lng={longitude}&adr={address}&desc={photodesc}&story={poistory}\");

        IDictionary<string,string> parameters = new Dictionary<string,string>();
        parameters.Add(\"name\",pin.Name);
        parameters.Add(\"latitude\",pin.Location.Latitude.ToString().Replace(\",\",\".\"));
        parameters.Add(\"longitude\",pin.Location.Longitude.ToString().Replace(\",\".\"));
        parameters.Add(\"address\",pin.Address);
        parameters.Add(\"photodesc\",pin.PhotoDesc);
        parameters.Add(\"poistory\",pin.Tag.ToString());
        Uri formattedUri = uriTemplate.BindByName(baseAddressUri,parameters);
        wc.UploadStringAsync(formattedUri,\"POST\");
    }