ajax删除DB数据

1.前台js

 $().ready(function () {

     $('[name="checkAll"]').click(function () {
         if ("checked" == $('input[name="checkAll"]').attr("checked")) {
             $('input[type="checkbox"]').attr("checked", "checked");
         } else {
             $('input[type="checkbox"]').removeAttr("checked");
         }
     });

     $('input[name="btnDelete"]').click(function () {
         var checkCount = 0;

         $('input[type="checkbox"]').not('input[name="checkAll"]').each(function (index, element) {
             if ("checked" == $(this).attr("checked")) {
                 checkCount++;
             }
         });

         if (checkCount <= 0) {
             alert("请选择您要删除的数据！");
             return false;
         }

         if (confirm("确定要删除吗？")) {
             var data = "[";

             $('input[type="checkbox"]').not('input[name="checkAll"]').each(function (index, element) {
                 if ("checked" == $(this).attr("checked")) {
                     data += "{id : " + $(this).val() + "} ,";
                 }
             });

             if (data != "[") {
                 data = data.substring(0, data.length - 1) + "]";

                 $.post("/User/DeleteById", data, function success(result) {
                     //1.ajax返回单个字符串内容
                     //var msg = " <font style='color:red'>" + result + "</font>";
                     //if ($('#ajaxMsg').html() == '') {
                     //    $('#ajaxMsg').append(msg);
                     //}

                     //2.ajax返回多个字符串内容
                     var msg = " <font style='color:red'>删除成功！</font>";
                     if ($('#ajaxMsg').html() == '') {
                         $('#ajaxMsg').append(msg);
                     }

                     $('input[name="checkAll"]').removeAttr("checked");

                     $('input[type="checkbox"]').not('input[name="checkAll"]').each(function (index, element) {
                         $(this).parent().parent().remove();
                     });

                     var ajaxResult = $.parseJSON(result);
                     $.each(ajaxResult, function (index, element) {
                         var tr = "<tr>"
                                   + "<td><input type='checkbox' value='" + element.ID + "' /></td>"
                                   + "<td><a href='/User/Detail/" + element.ID + "'>" + element.UserName + "</a></td>"
                                   + "<td>" + element.Phone + "</td>"
                                   + "<td>" + element.Email + "</td>"
                                   + "<td>" + element.Address + "</td>"
                                   + "<td>" + element.CreateTime + "</td>"
                                   + "<td>" + element.UpdateTime + "</td>"
                                   + "<td><a href='/User/Edit/" + element.ID + "'>修改</a></td>"
                                   + "<td><a href='/User/Delete/" + element.ID + "'>删除</a></td>"
                                   + "</tr>";
                         $('table').append(tr);
                     });
                 });
             }
         }
     });
 });

2.后台代码：

[HttpPost]
        public ActionResult DeleteById()
        {
            String ajaxId = Request.Params[];

            JavaScriptSerializer js = new JavaScriptSerializer();
            List<AjaxReq> ajaxReqList = js.Deserialize<List<AjaxReq>>(ajaxId);
            if (null != ajaxReqList &&  < ajaxReqList.Count())
            {
                foreach (AjaxReq ajaxReq in ajaxReqList)
                {
                    UserDto user = new UserDto();
                    user.ID = ajaxReq.ID;
                    db.Entry<UserDto>(user).State = System.Data.EntityState.Deleted;
                    db.SaveChanges();
                }
            }

            List<UserDto> userList = db.Users.ToList();

            //1.ajax返回单个字符串内容
            //return base.Json("删除成功！");

            //2.ajax返回多个字符串内容
            return base.Json(js.Serialize(userList));

        }