一尘不染

使用jQuery Ajax将参数传递给WebMethod

json

我有一个简单的web方法和ajax调用,并继续收到一个错误,说它无法将字符串转换为IDictionary对象?

这是ajax调用:

var params = '{"ID":"' + rowid + '"}';
$.ajax({
  url: 'EDI.asmx/GetPartnerDetails',
  type: "POST",
  contentType: "application/json; charset=utf-8",
  data: JSON.stringify(params),
  dataType: "json", //not json . let me try to parse
  success: function(msg, st) { . . . .

这是webMethod:

<WebMethod()> _
Public Function GetPartnerDetails(ByVal ID As String) As String

    'Dim objParam As IDictionary = CType(JsonConvert.DeserializeObject(ID), IDictionary)
    'Dim rowID As String = objParam("ID")

    Dim objController As New HealthComp.BLL.X12Partners.TradingPartnersController
    Dim objInfo As TradingPartnersInfo = objController.FetchByPartnerID(Int32.Parse(ID))

    Return JsonConvert.SerializeObject(objInfo)
End Function

这是我从FireBug中看到的内容:

响应标头
服务器:Microsoft-IIS / 5.1
日期:2009年4月9日,星期四,格林尼治标准时间
jsonerror:true
缓存控制:私有
内容类型:application / json; charset = utf-8
内容长度:1331

POST:“ {\” ID \“:\” 4 \“}”

响应:

{“消息”:“无法在系统上将类型为\ u0027System.String \ u0027的对象转换为类型为\
u0027System.Collections .Generic.IDictionary`2 [System.String,System.Object] \
u0027“,” StackTrace“:”。 Web.Script.Serialization
.ObjectConverter.ConvertObjectToTypeInternal(Object o,Type
type,JavaScriptSerializer序列化器,布尔throwOnError,Object&ConvertedObject)\ r \
n位于System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeMain(Object
o,Type
type,JavaScriptSerializer序列化器,System.Web.Script.Serialization.ObjectConverter.ConvertObjectToType(对象o,类型类型,JavaScriptSerializer序列化器)的布尔型throwOnError,Object&convertObject)\
r \ n,System.Web.Script.Serialization.JavaScriptSerializer.Deserialize(
JavaScriptSerializer序列化器,字符串输入,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序列化器)\在System.Web.Script.Services.RestHandler
.GetRawParams(WebServiceMethodData methodData,HttpContext上下文)处为r \
n,在System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext上下文,WebServiceMethodData
methodData)处为r \ n“,” ExceptionType“ :“
System.InvalidOperationException”}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“}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“}

有人对此有任何想法吗?谢谢!!


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2020-07-27

共1个答案

一尘不染

快速项目:

您的可变参数 var params = '{ID:' + rowid + '}'; 是一个字符串。

所以这行: data: JSON.stringify(params),是多余的(或者应该是)。刚设定data: params,

接下来,在您的Web方法上,将结果转换为JSON字符串并将其作为字符串返回。如果您的Web方法类具有ScriptMethod属性,则无需这样做。只需将数据作为本机类型返回,Asp.Net将为您完成向JSON的转换。

您可能会阅读以下文章:http :
//elegantcode.com/2009/02/21/javascript-arrays-via-jquery-ajax-to-an-aspnet-
webmethod/

http://encosia.com/2008/03/27/using-jquery-to-consume-aspnet-json-web-
services/

2020-07-27