C#-ASP.NET MVC-架构【1】-自定义错误页

自定义异常本来是一件很简单的事情，没想到在做的过程中遇到各种坑，目前来说，还有Session过期和Ajax请求这两种情况没有特殊处理，其他的基本已经可以使用，等慢慢完善吧。

一、在web.config中新增customErrors节点

  <system.web>    
    ...
    <customErrors mode="Off" ></customErrors>
    ...
  </system.web>

二、在Global.asax中注释掉代码行

    protected void Application_Start()
    {
        ...
        //FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        ...
    }

三、在Global.asax中新增方法

    protected void Application_Error(object sender, EventArgs e)
    {
        Exception exception = Server.GetLastError();
        Response.TrySkipIisCustomErrors = true;
        Response.Clear();

        if (exception != null)
        {
            string errorpath = this.Context.Request.Path;

            HttpException httpException = exception as HttpException;
            string action = "Index";

            if (httpException != null)
            {
                switch (httpException.GetHttpCode())
                {
                    case 401:
                        action = "AccessDenied";
                        break;
                    case 404:
                        action = "NotFound";
                        break;
                }
            }

            Server.ClearError();

            string url = String.Format("~/Error/{0}/?errorpath={1}", action, errorpath);
            Response.Redirect(url, true);
        }
    }

四、新增控制器ErrorController

    public class ErrorController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        public ActionResult NotFound()
        {
            return View();
        }

        public ActionResult AccessDenied()
        {
            return View();
        }
    }