c# - Javascript - jquery ajax 发布错误让我发疯

Question

似乎无法弄清楚这一点。

我有一个定义为 (c#,.net) 的 Web 服务

[WebMethod]
public string SubmitOrder(string sessionid, string lang,int invoiceno,string email,string emailcc)
{
   //do stuff.
   return stuff;
}

当我在 Vstudio 中通过自动生成的测试工具对其进行测试时，效果很好。

但是当我从 jquery 调用它时

$j.ajax({
        type: "POST",
        url: "/wservice/baby.asmx/SubmitOrder",                     
        data: "{'sessionid' : '"+sessionid+"',"+
              "'lang': '"+usersettings.Currlang+"',"+
              "'invoiceno': '"+invoicenr+"',"+
              "'email':'"+$j(orderids.txtOIEMAIL).val()+"',"+
              "'emailcc':'"+$j(orderids.txtOICC).val()+"'}",
        contenttype: "application/json; charset=utf-8",         
        datatype: "json",
        success: function (msg) {
            submitordercallback(msg);
        },
        error: AjaxFailed
    });     

我得到了这个有趣的错误:

responseText: System.InvalidOperationException: Missing parameter: sessionid.    at  System.Web.Services.Protocols.ValueCollectionParameterReader.Read(NameValueCollection collection)    at  System.Web.Services.Protocols.HtmlFormParameterReader.Read(HttpRequest request)    at  System.Web.Services.Protocols.HttpServerProtocol.ReadParameters()    at  System.Web.Services.Protocols.WebServiceHandler.CoreProcessRequest()  

data evaluates to: {'sessionid' : 'f61f8da737c046fea5633e7ec1f706dd','lang': 'SE','invoiceno': '11867','email':'steve@jobs.com','emailcc':''}

Ok, fair enough, but this function from jquery communicates fine with another webservice.

Defined:

c#:

[WebMethod]
public string CheckoutClicked(string sessionid,string lang)
{
//*snip*

//jquery:

var divCheckoutClicked = function()
{
    $j.ajax({
        type: "POST",
        url: "/wservice/baby.asmx/CheckoutClicked",                     
        data: "{'sessionid': '"+sessionid+"','lang': '"+usersettings.Currlang+"'}",         
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (msg) {
            divCheckoutClickedCallback(msg);
        },
        error: AjaxFailed
    });     
}

Answer 1

data: {sessionid: sessionid,
       lang: usersettings.Currlang,
       invoiceno: invoicenr,
       email: $j(orderids.txtOIEMAIL).val(),
       emailcc: $j(orderids.txtOICC).val()
        },