C# 错误400-->；来自客户端的wcf错误请求

我是WCF新手。我正在尝试从我的aspx页面调用WCF来发布xml并返回json。我的服务运行良好，但我收到了一个错误“远程服务器返回了一个错误：（400）错误请求”。也许WCF的配置文件给了我这样一个错误响应。我尝试了很多，但困惑只会出现在我身上。请帮助我编写代码。。 我的客户端代码是

string SampleXml = @"<parent>" +
               "<child>" +
                  "<username>username</username>" +
                    "<password>password</password>" +
                   "</child>" +
                "</parent>";
        //ASCIIEncoding encoding = new ASCIIEncoding();
        string postData = SampleXml.ToString();
        byte[] data = Encoding.UTF8.GetBytes(postData); 
        string url = "http://localhost:52573/Service1.svc/postjson/";
        HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
        request.Method = "POST";
        request.ContentType = "applicatoin/xml;charset=utf-8";
        //request.Accept = "application/json";
        request.ContentLength = data.Length;
        String test = String.Empty;
        Stream newStream = request.GetRequestStream();
        newStream.Write(data, 0, data.Length);
        newStream.Close();
        using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
        {
            Stream dataStream = response.GetResponseStream();
            StreamReader reader = new StreamReader(dataStream);
            test = reader.ReadToEnd();
            reader.Close();
            dataStream.Close();
        }
        Response.Write(test);

接口是

 [OperationContract]
    [WebInvoke(UriTemplate = "postjson",Method="POST",RequestFormat=WebMessageFormat.Xml, ResponseFormat = WebMessageFormat.Json,BodyStyle = WebMessageBodyStyle.Wrapped)]
    string postjson(string streamdata);

---

经过长时间的斗争，输出来到这里。我没有更改WCF的web.config中的任何代码。这里是我的客户端代码

 protected void Page_Load(object sender, EventArgs e)
    {

        // Restful service URL
        string url = "http://localhost:52573/Service1.svc/postjson";
        // declare ascii encoding
        ASCIIEncoding encoding = new ASCIIEncoding();
        string strResult = string.Empty;
        // sample xml sent to Service & this data is sent in POST
        string SampleXml = @"<parent>" +
               "<child>" +
                  "<username>username</username>" +
                    "<password>password</password>" +
                   "</child>" +
                "</parent>";
        string postData = SampleXml.ToString();
        // convert xmlstring to byte using ascii encoding
        byte[] data = encoding.GetBytes(postData);
        // declare httpwebrequet wrt url defined above
        HttpWebRequest webrequest = (HttpWebRequest)WebRequest.Create(url);

        // set method as post
        webrequest.Method = "POST";
        // set content type
        //webrequest.Accept = "application/xml;q=0.8";
        //webrequest.ContentType = "application/xml;charset=utf-8";
        webrequest.ContentType = "application/x-www-form-urlencoded";
        // set content length
        webrequest.ContentLength = data.Length;
        // get stream data out of webrequest object
        Stream newStream = webrequest.GetRequestStream();
        newStream.Write(data, 0, data.Length);
        newStream.Close();
        // declare & read response from service
        HttpWebResponse webresponse = (HttpWebResponse)webrequest.GetResponse();

        // set utf8 encoding
        Encoding enc = System.Text.Encoding.GetEncoding("utf-8");
        // read response stream from response object
        StreamReader loResponseStream =
            new StreamReader(webresponse.GetResponseStream(), enc);
        // read string from stream data
        strResult = loResponseStream.ReadToEnd();
        // close the stream object
        loResponseStream.Close();
        // close the response object
        webresponse.Close();
        // below steps remove unwanted data from response string
        Response.Write(strResult);

    }

---

伙计们，这就是我所做的…我也清理了最近的文件…

这个怎么样？当您打开web服务所在的url时，它是否会显示web服务的描述？感谢您的回复，buddy，但它还不起作用…sorryrequest.ContentType=“applicationin/xml；charset=utf-8”；“应用程序”拼写错误。。。这是不是你的问题，我不确定。为了澄清。。。你的意思是服务器端服务工作正常并且经过测试吗？谢谢Nathan…但是这里仍然有400人…这还不够信息。能否将WCF服务实现添加到问题细节中，尤其是postJson方法？

 [OperationContract]
    [WebInvoke(UriTemplate = "postjson",Method="POST",RequestFormat=WebMessageFormat.Xml, ResponseFormat = WebMessageFormat.Json,BodyStyle = WebMessageBodyStyle.Wrapped)]
    string postjson(string streamdata);

 protected void Page_Load(object sender, EventArgs e)
    {

        // Restful service URL
        string url = "http://localhost:52573/Service1.svc/postjson";
        // declare ascii encoding
        ASCIIEncoding encoding = new ASCIIEncoding();
        string strResult = string.Empty;
        // sample xml sent to Service & this data is sent in POST
        string SampleXml = @"<parent>" +
               "<child>" +
                  "<username>username</username>" +
                    "<password>password</password>" +
                   "</child>" +
                "</parent>";
        string postData = SampleXml.ToString();
        // convert xmlstring to byte using ascii encoding
        byte[] data = encoding.GetBytes(postData);
        // declare httpwebrequet wrt url defined above
        HttpWebRequest webrequest = (HttpWebRequest)WebRequest.Create(url);

        // set method as post
        webrequest.Method = "POST";
        // set content type
        //webrequest.Accept = "application/xml;q=0.8";
        //webrequest.ContentType = "application/xml;charset=utf-8";
        webrequest.ContentType = "application/x-www-form-urlencoded";
        // set content length
        webrequest.ContentLength = data.Length;
        // get stream data out of webrequest object
        Stream newStream = webrequest.GetRequestStream();
        newStream.Write(data, 0, data.Length);
        newStream.Close();
        // declare & read response from service
        HttpWebResponse webresponse = (HttpWebResponse)webrequest.GetResponse();

        // set utf8 encoding
        Encoding enc = System.Text.Encoding.GetEncoding("utf-8");
        // read response stream from response object
        StreamReader loResponseStream =
            new StreamReader(webresponse.GetResponseStream(), enc);
        // read string from stream data
        strResult = loResponseStream.ReadToEnd();
        // close the stream object
        loResponseStream.Close();
        // close the response object
        webresponse.Close();
        // below steps remove unwanted data from response string
        Response.Write(strResult);

    }

     public string postjson(Stream streamdata)
    {
        StreamReader reader = new StreamReader(streamdata);
        string xmlString = reader.ReadToEnd();
        string returnValue = new JavaScriptSerializer().Serialize(xmlString);
        return returnValue.ToString();
    }