客户端以Post方式，json数据格式调用WCF，传入参数不是json，怎么自定义异常？？

[白日梦想jun]

1、WCF方法S_RCBD001规定请求和回应都是json格式，在方法内部用了try catch处理异常，返回具体信息；
2、若客户端调用为这样 SendHttpRequest("http://192.168.0.104:8081/Service1.svc", "S_RCBD001", JsonSerialize(""),"application/json");则没有问题；
但是若SendHttpRequest("http://192.168.0.104:8081/Service1.svc", "S_RCBD001", “”,"application/json");这样会报400的异常，怎么能让它不报400的异常，而是也返回自定义异常呢？
3.新定义以string为参数的S_RCBD002接口，接受参数后自己做反序列化，但是在客户端调用SendHttpRequest("http://192.168.0.104:8081/Service1.svc", "S_RCBD002", "", "text/plain"); 一直也是400的错误状态码。
非常急，希望有遇到过类似的问题的大佬们指导指导。

接口：
 [OperationContract]
        [WebInvoke(Method = "POST", BodyStyle = WebMessageBodyStyle.Bare, 
            RequestFormat = WebMessageFormat.Json, 
            ResponseFormat = WebMessageFormat.Json, UriTemplate = "/S_RCBD001")]
         CommRes S_RCBD001(CommReq comm);
[OperationContract]
        [WebInvoke(Method = "POST", BodyStyle = WebMessageBodyStyle.WrappedRequest, ResponseFormat = WebMessageFormat.Json, UriTemplate = "/S_RCBD002")]
        CommRes S_RCBD002(String comm);  
具体实现：
 public CommRes S_RCBD001(CommReq commReq)
        {
            InsertMsg msg = new InsertMsg();
            CommRes crs = new CommRes();
            try
            {
                InputObj p = (InputObj)commReq.reqbody;
                          
                  //具体业务操作 ……
                crs.serialno = commReq.serialno;
                crs.resptime = System.DateTime.Now.ToString("yyyyMMddHHmmssSSS");
                crs.resultcode = "1";
                crs.resultmsg = "成功";
                crs.respbody = null;
            }
   
            catch (Exception ex)
            {
                crs.serialno = commReq.ToString();
                crs.resptime = System.DateTime.Now.ToString("yyyyMMddHHmmssSSS");
                crs.resultcode = "-1";
                crs.resultmsg = "请求出错";
                crs.respbody = null;
            }
            return crs;
        }

public CommRes S_RCBD002(string com)
        {
            InsertMsg msg = new InsertMsg();
            CommRes crs = new CommRes();
            CommReq commReq = null;
            try
            {
                commReq = jss.Deserialize<CommReq>(com);
                 InputObj p = (InputObj)commReq.reqbody;             
                
                  //具体业务操作 ……
                crs.serialno = commReq.serialno;
                crs.resptime = System.DateTime.Now.ToString("yyyyMMddHHmmssSSS");
                crs.resultcode = "1";
                crs.resultmsg = "成功";
                crs.respbody = null;
            }
   
            catch (Exception ex)
            {
                crs.serialno = commReq.ToString();
                crs.resptime = System.DateTime.Now.ToString("yyyyMMddHHmmssSSS");
                crs.resultcode = "-1";
                crs.resultmsg = "请求出错";
                crs.respbody = null;
            }
            return crs;
        }

客户端调用方法:
public static string SendHttpRequest(string requestURI, string requestMethod, string json, string ContentType)
        {         
            //json格式请求数据
            string requestData = json;
            //拼接URL
            string serviceUrl = string.Format("{0}/{1}", requestURI, requestMethod);
            HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(serviceUrl);
            //utf-8编码
            byte[] buf = System.Text.Encoding.GetEncoding("UTF-8").GetBytes(requestData);

            //post请求
            myRequest.Method = "POST";
            myRequest.Accept = "*/*";
            myRequest.ContentLength = buf.Length;

            //指定为json否则会出错
            myRequest.ContentType = ContentType;
            myRequest.MaximumAutomaticRedirections = 1;
            myRequest.AllowAutoRedirect = true;


            //这个在Post的时候，一定要加上，如果服务器返回错误，他还会继续再去请求，不会使用之前的错误数据，做返回数            
            myRequest.ServicePoint.Expect100Continue = false;
            HttpRequestCachePolicy noCachePolicy = new HttpRequestCachePolicy(HttpRequestCacheLevel.NoCacheNoStore);
            myRequest.CachePolicy = noCachePolicy;

            string ReqResult = "";
            Stream newStream = null;
            HttpWebResponse myResponse = null;
            StreamReader reader = null;

            try
            {
                newStream = myRequest.GetRequestStream();
                newStream.Write(buf, 0, buf.Length);
            }
            catch (Exception e)
            {
                
            }
            finally
            {
                if (newStream != null) {
                    newStream.Close();
                }
                
            }

            //获得接口返回值，格式
            try
            {
                myResponse = (HttpWebResponse)myRequest.GetResponse();
                reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);
                ReqResult = reader.ReadToEnd();
            }
            catch (WebException e)
            {
                ReqResult = e.Message;
            }
            finally
            {
                if (reader != null) {
                    reader.Close();
                }
                if (myResponse != null) {
                    myResponse.Close();
                }
                
            }

            return ReqResult;

        }

[百合杰]

一般的做法就是不管 因为你格式都错了 就别想着人家懂你的意思