在jQuery ajax调用中向ASP传递参数。净webmethod

I know there are more threads about this but they dont help me and I'm going insane here!

我知道有更多的线索，但他们没有帮助我，我在这里疯了!

I wanna pass some parameters in to a web method using jQuery Ajax.

我想使用jQuery Ajax向web方法传递一些参数。

var paramList = '';
for(i = 0; i < IDList.length; i++){
    if (paramList.length > 0) paramList += ',';  
        paramList += '"' + 'id' + '":"' + IDList[i].value + '"';  
    }
    paramList = '{' + paramList + '}';  
    var jsonParams = JSON.stringify(paramList);


    $.ajax({
        type: "POST",          
        url: "editactivity.aspx/UpdateSequenceNumber",          
        data: jsonParams,
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function(response) {

        }
    });

In the ajax call, if I put data to paramList I get the error: "Invalid web service call, missing value for parameter: \u0027a\u0027."

在ajax调用中，如果我将数据放入paramList，就会得到错误:“无效的web服务调用，参数缺失值:\u0027a\u0027。”

If I put data to jsonParams I get the error:

如果我将数据放到jsonParams中，我会得到错误:

"Cannot convert object of type \u0027System.String\u0027 to type \u0027System.Collections.Generic.IDictionary`2[System.String,System.Object]\u0027"

无法转换\u0027系统的对象。字符串\ u0027类型\ u0027System.Collections.Generic.IDictionary 2[System.String System.Object]\ u0027”

If I write out paramList, it's in a correct JSON format like {"id":"140", "id":"138"}

如果我写出paramList，它是一种正确的JSON格式，比如{"id":"140"， "id":"138"}

If I write out jsonParams, it's in an incorrect format like "{\"id\":\"140\",\"id\":\"138\"}"

如果我写jsonParams，它的格式是错误的，比如“{\”id\:\“140\”\“id\”\“\”\“138\”}

The web method: (it doesn't do that much yet..)

web方法:(它还没有做那么多…)

[System.Web.Services.WebMethod]
    public static string UpdateSequenceNumber(string a, string b)
    {
         return a+b;
    }

What am I doing wrong? Can't seem to get this JSON thing right.

我做错了什么?似乎无法正确处理JSON。

UPDATE:

更新:

After some help from the first answer I now send {"id":["138","140"]} in the AJAX request.

在第一个答案的帮助下，我现在在AJAX请求中发送{"id":["138"，"140"}。

The web method now takes a string called id as the parameter instead.

web方法现在使用一个名为id的字符串作为参数。

[System.Web.Services.WebMethod]
public static string UpdateSequenceNumber(string id)
{
     return id;
}

Now I get the new error:

现在我得到了新的错误:

"Type \u0027System.Array\u0027 is not supported for deserialization of an array."

“类型\ u0027System。阵列\u0027不支持对阵列进行反序列化。

1 个解决方案

#1

Your json parameter names must be same with the c# paramter names.

您的json参数名称必须与c#参数名称相同。

{"a":"140", "b":"138"}

If you are sending unknown number of parameters to server, you may concat at client-side into one parameter and then split at server-side.

如果要向服务器发送未知数量的参数，可以将客户端转换为一个参数，然后在服务器端进行分割。

#1