ajax调用将服务端自定义异常反馈到网页提示，本地测试正常，上传阿里云服务器后却是服务器内部异常（500码），这是怎么回事？

......

//扣减充值记录

var payList = GetRemainAmount(context, wxUser.MemberId);

payList = payList.OrderBy(c => c.PayId).ToList();

var sum = payList.Sum(c => c.Amount - c.UsedAmount);

if (info.Price > sum) throw new ShowErrorException("充值余额不足以支付！");

public class MvcHandleErrorAttribute : HandleErrorAttribute

{

	public override void OnException(ExceptionContext context)

	{

		base.OnException(context);

		context.ExceptionHandled = true;

		ResultType resultType = ResultType.error;

		string showMessage = string.Empty;

		string errorMessage = string.Empty;



		//设置异常类型（影响客户端提示的图标）

		if (context.Exception is ShowInfoException)

		{

			resultType = ResultType.info;

		}

		else if (context.Exception is ShowWarningException)

		{

			resultType = ResultType.warning;

		}



		//异常消息处理

		if (context.Exception is ShowException)

		{

			//代码执行会进入这里：显示类异常:在客户端提示    

			showMessage = context.Exception.Message;

		}

		else

		{

			//其他类Exception：优化并记录日志，和本问题无关，代码不进入此处

			......

		}



		context.HttpContext.Response.StatusCode = 200;		//发现问题后期补救的措施，想将500错误改为200，无效果

		context.Result = new ContentResult { Content = new AjaxResult { state = resultType.ToString(), message = showMessage }.ToJson() };

	}

}

$.confirm({

	title: '',

	text: '是否确定支付'+price+"个xx币以查看联系方式？",

	onOK: function () {

		$.ajaxEx({

			url: "/Info/Item/PayAndView",

			type: "post",

			param: { id: infoId },

			success: function (data) {

				self.infoForm.Person(data.Person);

				self.infoForm.Phone(data.Phone);

				self.infoForm.AmountTag(data.AmountTag);

				self.enablePayBtn(false);

			}

		});

	}

});

$.ajaxEx = function (options) {

    var defaults = {

        url: "",

        param: [],

        type: "get",

        async: false,

        beforeSend: null,

        complete: null

    };

    var options = $.extend(defaults, options);

    if (options.url == "") return;

    if (options.type == "post") {

        if ($('[name=__RequestVerificationToken]').length > 0) {

            options.param["__RequestVerificationToken"] = $('[name=__RequestVerificationToken]').val();

        }

    }

    $.ajax({

        url: options.url,

        data: options.param,

        type: options.type,

        dataType: "json",

        async: options.async,

        success: function (data) {

            if (!data.state) {  //返回的是Json格式结果集，一般是get操作

                if (options.success) options.success(data);

            } else {    //返回AjaxResult格式的json状态数据，一般是post操作

                if (data.state == "success") {

                    if (options.success) options.success(data);

                } else {

                    $.alert(data.message, "错误");

                }

            }

        },

        error: function (XMLHttpRequest, textStatus, errorThrown) {

            $.alert(errorThrown, "错误");

        },

        beforeSend: function () {

            if (options.beforeSend) options.beforeSend();

        },

        complete: function () {

            if (options.complete) options.complete();

        }

    });

}