看看这个问题：
Using jQuery's getJSON method with an ASP.NET Web Form
它显示了如何做到这一点。
一个例子：
默认.aspx：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
<!--
$(function () {
$.ajax({
type: "POST",
url: "WebService.asmx/ValidateNameUpdateable",
data: "{\"input\":5}",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (msg) {
// (msg.d is the retrieved data)
var d = msg.d;
if (d == 22) {
alert("OK");
}
else {
alert("Not OK");
}
},
error: function (msg) {
}
});
});
//-->
</script>
</body>
</html>
WebService.cs（在 App_Code 中）：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
/// <summary>
/// Summary description for WebService
/// </summary>
[System.Web.Script.Services.ScriptService]
[WebService(Namespace = "http://tempuri.org/")] // <-- Put something like: services.yourdomain.com in here.
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class WebService : System.Web.Services.WebService {
[WebMethod]
public int ValidateNameUpdateable(int input)
{
return input == 5 ? 22 : -1;
}
}
WebService.asmx：
<%@ WebService Language="C#" CodeBehind="~/App_Code/WebService.cs" Class="WebService" %>
我希望这能解释这个想法。
如果您希望能够传递更高级的结构（非整数或字符串），您可能需要考虑使用 JSON。
对于 JSON 的解析，我将使用 JQuery 函数 parseJSON
您需要做的就是在 Web 服务（结构）上创建一个结构，并使用 JSON 序列化器对其进行序列化。
另一个使用 JSON 的例子：
默认.aspx：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
<!--
$(function () {
function getRecord(id) {
$.ajax({
type: "POST",
url: "WebService.asmx/GetRecord",
data: "{\"id\":" + id + "}",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (msg) {
// (msg.d is the retrieved data)
var d = $.parseJSON(msg.d);
if (d.RecordExists) {
alert("Record with id: " + d.ID + "\nFirstName: " + d.FirstName + "\nLastName: " + d.LastName);
}
else {
alert("Record doesn't exist.");
}
},
error: function (msg) {
}
});
}
getRecord(1);
getRecord(4);
getRecord(0);
});
//-->
</script>
</body>
</html>
WebService.cs：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Script.Serialization;
/// <summary>
/// Summary description for WebService
/// </summary>
[System.Web.Script.Services.ScriptService]
[WebService(Namespace = "http://tempuri.org/")] // <-- Put something like: services.yourdomain.com in here.
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class WebService : System.Web.Services.WebService {
[Serializable]
protected class Record
{
public bool RecordExists { get; set; }
public int ID { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public Record() // Initializes default values
{
RecordExists = true;
ID = 0;
FirstName = "";
LastName = "";
}
}
[WebMethod]
public string GetRecord(int id)
{
// Initialize the result
Record resultRecord = new Record();
resultRecord.RecordExists = true;
resultRecord.ID = id;
// Query database to get record...
switch (id)
{
case 0:
resultRecord.FirstName = "John";
resultRecord.LastName = "Something";
break;
case 1:
resultRecord.FirstName = "Foo";
resultRecord.LastName = "Foo2";
break;
default:
resultRecord.RecordExists = false;
break;
}
// Serialize the result here, and return it to JavaScript.
// The JavaScriptSerializer serializes to JSON.
return new JavaScriptSerializer().Serialize(resultRecord);
}
}
请注意，AJAX 是异步的，这意味着即使页面是按特定顺序请求的，它们也不是按特定顺序接收的。这意味着即使您按 1、4、0 的顺序请求记录很困难，也可以按任何顺序接收它们，例如 4、1、0 或 1、0、4。