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使用jQuery成功将JSON对象发送到ASP.NET WebMethod

ajax

我已经为此工作了3个小时,已经放弃了。我只是试图使用jQuery将数据发送到ASP.NET
WebMethod。数据基本上是一堆键/值对。因此,我尝试创建一个数组并将这些对添加到该数组中。

我的WebMethod(aspx.cs)看起来像这样(对于我在JavaScript中构建的内容,这可能是错误的,我只是不知道):

[WebMethod]
public static string SaveRecord(List<object> items)
{
    ...
}

这是我的示例JavaScript:

var items = new Array;

var data1 = { compId: "1", formId: "531" };
var data2 = { compId: "2", formId: "77" };
var data3 = { compId: "3", formId: "99" };
var data4 = { status: "2", statusId: "8" };
var data5 = { name: "Value", value: "myValue" };

items[0] = data1;
items[1] = data2;
items[2] = data3;
items[3] = data4;
items[4] = data5;

这是我的jQuery AJAX调用:

var options = {
    error: function(msg) {
        alert(msg.d);
    },
    type: "POST",
    url: "PackageList.aspx/SaveRecord",
    data: { 'items': items },
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    async: false,
    success: function(response) {
        var results = response.d;
    }
};
jQuery.ajax(options);

我得到错误:

Invalid JSON primitive: items.

因此,如果我这样做:

var DTO = { 'items': items };

并像这样设置数据参数:

data: JSON.stringify(DTO)

然后我得到这个错误:

Cannot convert object of type \u0027System.String\u0027 to type \u0027System.Collections.Generic.List`1[System.Object]\u0027

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2020-07-26

共1个答案

小编典典

使用AJAX.NET时,我总是使输入参数只是一个普通的旧对象,然后使用javascript反序列化器将其转换为所需的任何类型。至少以这种方式,您可以调试并查看Web方法正在接收的对象类型。

使用jQuery时需要将对象转换为字符串

<!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>
    <form id="form1" runat="server">
        <asp:ScriptManager ID="sm" runat="server" EnablePageMethods="true">
            <Scripts>
                <asp:ScriptReference Path="~/js/jquery.js" />
            </Scripts>
        </asp:ScriptManager>
        <div></div>
    </form>
</body>
</html>
<script type="text/javascript" language="javascript">
    var items = [{ compId: "1", formId: "531" },
        { compId: "2", formId: "77" },
        { compId: "3", formId: "99" },
        { status: "2", statusId: "8" },
        { name: "Value", value: "myValue"}];

        //Using Ajax.Net Method
        PageMethods.SubmitItems(items,
            function(response) { var results = response.d; },
            function(msg) { alert(msg.d) },
            null);

        //using jQuery ajax Method
        var options = { error: function(msg) { alert(msg.d); },
                        type: "POST", url: "WebForm1.aspx/SubmitItems",
                        data: {"items":items.toString()}, // array to string fixes it *
                        contentType: "application/json; charset=utf-8",
                        dataType: "json",
                        async: false, 
                        success: function(response) { var results = response.d; } }; 
        jQuery.ajax(options);
</script>

和背后的代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Script.Serialization;
using System.Web.Script.Services;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace CustomEquip
{
    [ScriptService]
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        [WebMethod]
        public static void SubmitItems(object items)
        {
            //break point here
            List<object> lstItems = new JavaScriptSerializer().ConvertToType<List<object>>(items);
        }
    }
}
2020-07-26