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[0];

            JavaScriptSerializer js = new JavaScriptSerializer();
            List<AjaxReq> ajaxReqList = js.Deserialize<List<AjaxReq>>(ajaxId);
            if (null != ajaxReqList && 0 < 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));
            
        }