ASP.NET Ajax、PageMethods完整代码

<script>$.ajax({    type: "POST",    url: "UploadPicture.aspx/ModulePhotoUpload",    data: { argjson: argjson, menuid: menuid },    contentType: "application/json; charset=utf-8",    dataType: "json",    success: function(success) {        alert(success);        // Do something interesting here.    }});</script>

body中增加ScriptManager<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true"></asp:ScriptManager><script>PageMethods.ModulePhotoUpload(argjson, menuid, InsModulePhotoCallBack);function InsModulePhotoCallBack(success) {  alert(success);}</script>

后台定义方法可以用：aspx、ashx、asmx、谨记，千万千万别在ascx用户控件后台写。用户控件是无法通过Ajax访问的，会出现“无法访问ascx”错误，PageMethods访问则会报“PageMethods未定义”错误。

/// <summary>/// 图片上传结果处理/// </summary>/// <param name="arg"></param>/// <returns>1 上传完成，2上传失败</returns>[System.Web.Services.WebMethod()][System.Web.Script.Services.ScriptMethod()]public static string ModulePhotoUpload(string argjson, int menuid){    //此处实现业务代码    return "上传完成";}