一、自定義錯誤頁面

 有些時候，我們想使用自定義的錯誤頁面，該怎麼處理那。

翻頁其他大牛寫的部落格，看到有這種方式，自定義屬性Class繼承FileterAttribute，

重寫OnException方法，程式碼如下

    public class MyErrorAttribute: HandleErrorAttribute
    {
        public override void OnException(ExceptionContext filterContext)
        {
            //獲取異常物件
            Exception ex = filterContext.Exception;
            //記錄錯誤日誌

            //記錄出現錯誤的IP地址
            string strIP = filterContext.HttpContext.Request.UserHostAddress;
            string strUser = System.Environment.MachineName; ;
            string strPath = filterContext.HttpContext.Request.Path;

            StringBuilder sb = new StringBuilder();
            sb.Append("IP:【" + strIP + "】" + Environment.NewLine);
            sb.Append("UserName:【" + strUser + "】" + Environment.NewLine);
            sb.Append("Action:【" + strPath + "】" + Environment.NewLine);
            sb.Append("Error in 【" + filterContext.HttpContext.Request.Url.ToString() + "】" + Environment.NewLine);
            sb.Append("Error Message 【" + ex.Message + "】" + Environment.NewLine);
            sb.Append("Browser 【" + filterContext.HttpContext.Request.Browser.Browser + "||");
            sb.Append(filterContext.HttpContext.Request.Browser.Id + "||");
            sb.Append(filterContext.HttpContext.Request.Browser.Version + "||");
            sb.Append(filterContext.HttpContext.Request.Browser.Beta + "】");
            //記錄錯誤
            WriteError(sb.ToString());

            //導向友好錯誤介面
            filterContext.Result = new RedirectToRouteResult(new RouteValueDictionary(
                    new
                    {
                        controller = "Error",
                        action = "Page404",
                        returnUrl = filterContext.HttpContext.Request.Url,
                        returnMessage = "頁面不存在！"
                    }
                    ));


            //重要！！！告訴系統異常已經處理！！
            //如果沒有這個步驟，系統還是會按照正常的異常處理流程做
            filterContext.ExceptionHandled = true;

            //base.OnException(filterContext);
        }
 

1、記錄錯誤資訊

/// <summary>
/// 用於將錯誤資訊輸出到txt檔案
/// </summary>
/// <param name="errorMessage">錯誤詳細資訊</param>
public static void WriteError(string errorMessage)
{
    try
    {
        string path = "~/Error/" + DateTime.Today.ToString("yyMMdd") + ".txt";
        if (!File.Exists(System.Web.HttpContext.Current.Server.MapPath(path)))
        {
            File.Create(System.Web.HttpContext.Current.Server.MapPath(path)).Close();
        }
        using (StreamWriter w = File.AppendText(System.Web.HttpContext.Current.Server.MapPath(path)))
        {
            w.WriteLine("\r\nLog Entry : ");
            w.WriteLine("DateTime 【{0}】", DateTime.Now.ToString(CultureInfo.InvariantCulture));
            w.WriteLine(errorMessage);
            w.WriteLine("***********************************************************************************************");
            w.Flush();
            w.Close();
        }
    }
    catch (Exception ex)
    {
        WriteError(ex.Message);
    }
}
 

網上大神寫的，他分得比較的細：

public class BaseHandleErrorAttribute : FilterAttribute, IExceptionFilter
    {
        public void OnException(ExceptionContext filterContext)
        {
            if (filterContext.ExceptionHandled == true)
            {
                HttpException httpExce = filterContext.Exception as HttpException;
                if (httpExce != null && httpExce.GetHttpCode() != 500)//為什麼要特別強調500 因為MVC處理HttpException的時候，如果為500 則會自動將其ExceptionHandled設定為true，那麼我們就無法捕獲異常
                {
                    return;
                }
            }
            Exception exception = filterContext.Exception;            
            if (exception != null)
            {
                HttpException httpException = exception as HttpException;
                if (httpException != null)
                {
                    //網路錯誤
                    filterContext.Controller.ViewBag.UrlRefer = filterContext.HttpContext.Request.UrlReferrer;
                    int DataEroorCode = httpException.GetHttpCode();
                    if (DataEroorCode == 404)
                    {
                        filterContext.HttpContext.Response.Redirect("~/SysError/404");
                    }
                    else if (DataEroorCode == 500)
                    {
                        filterContext.HttpContext.Response.Redirect("~/SysError/500");
                    }
                    else
                        filterContext.HttpContext.Response.Redirect("~/SysError/" + DataEroorCode);

                    //寫入日誌 記錄
                    filterContext.ExceptionHandled = true;//設定異常已經處理
                }
                else
                {
                    //程式設計或者系統錯誤，不處理，留給HandError處理
                }
            }                     
        }
    }