如何将Datatable作为参数传递给Webservice的httppost请求

Question

试图将datatable参数传递给webservice（asmx）方法，但出现以下错误：

  

{“消息”：“类型\ u0027System.Collections.Generic.IDictionary`2 [[System.String，mscorlib，Version = 4.0.0.0，Culture = neutral，PublicKeyToken = b77a5c561934e089]，[System.Object，mscorlib，版本= 4.0.0.0，区域性=中性，PublicKeyToken = b77a5c561934e089]] \ u0027不支持数组反序列化。“，” StackTrace“：”位于System.Web.Script.Serialization.ObjectConverter.ConvertListToObject（IList列表，类型类型，JavaScriptSerializer序列化器，布尔型throwOnError，IList \ u0026 convertedList）\ r \ n位于System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeInternal（Object o，Type type，JavaScriptSerializer序列化器，布尔型throwOnError，Object \ u0026 convertedObject）\ r \ System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeMain（Object o，Type type，JavaScriptSerializer serializer，Boolean throwOnError，Object \ u0026 conversionObject）在System.Web.Script.Serialization.JavaScriptSerializer.Deserialize（JavaScriptSerializer序列化器处为n ，字符串输入t，类型类型，Int32 depthLimit）\ r \ n在System.Web.Script.Serialization.JavaScriptSerializer.Deserialize [T]（字符串输入）\ r \ n在System.Web.Script.Services.RestHandler.GetRawParamsFromPostRequest（HttpContext上下文） ，JavaScriptSerializer序列化程序）\ r \ n（位于System.Web.Script.Services.RestHandler.GetRawParams（WebServiceMethodData methodData，HttpContext上下文））\ r \ n位于System.Web.Script.Services.RestHandler.ExecuteWebServiceCall（HttpContext上下文，WebServiceMethodData methodData） “，” ExceptionType“：” System.InvalidOperationException“}

我正在将数据表序列化为json对象，并将其通过http请求传递

 Request Code:
 var dsAttendance= GetBioMetricData();
            string jsonData;

 //here dsAttendance is dataset in which only one table is available
 if (dsAttendance != null && dsAttendance.Tables.Count != 0)
            {
                jsonData = 
 JsonConvert.SerializeObject(dsAttendance.Tables[0]);
            }
            else
            {
                jsonData = null;
            }
            var content = new StringContent(jsonData);
            var url = 
  ConfigurationManager.AppSettings["ClientSettingsProvider.ServiceUri"];
            var response = await Request(HttpMethod.Post, url+ 
  "/AttendanceLiveData", jsonData, new Dictionary<string, string>());                
            string responseText = await 
   response.Content.ReadAsStringAsync();



 static async Task<HttpResponseMessage> Request(HttpMethod pMethod, string 
 pUrl, string pJsonContent, Dictionary<string, string> pHeaders)
    {
        var httpRequestMessage = new HttpRequestMessage();
        httpRequestMessage.Method = pMethod;
        httpRequestMessage.RequestUri = new Uri(pUrl);
        foreach (var head in pHeaders)
        {
            httpRequestMessage.Headers.Add(head.Key, head.Value);
        }
        switch (pMethod.Method)
        {
            case "POST":
                HttpContent httpContent = new StringContent(pJsonContent, 
     Encoding.UTF8, "application/json");
                httpRequestMessage.Content = httpContent;
                break;

        }

        return await client.SendAsync(httpRequestMessage);
    }


 Web Service Code:


 [WebMethod(EnableSession = true)]              
      public string AttendanceLiveData(object dsAttendnceData)
      {            
        if (dsAttendnceData != null)
        {
            return "true";
        }
        else 
        {
            return null;
        }            
     }

需要通过Web服务方法从httppost请求传递的数据表