【MVC】错误页面设置和错误信息记录

一、自定义错误页面

有些时候，我们想使用自定义的错误页面，该怎么处理那。

翻页其他大牛写的博客，看到有这种方式，自定义属性Class继承FileterAttribute，

重写OnException方法，代码如下

public class MyErrorAttribute: HandleErrorAttribute
{
public override void OnException(ExceptionContext filterContext)
{
    //获取异常对象
    Exception ex = filterContext.Exception;
    //记录错误日志

    //记录出现错误的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 + "】");
    //记录错误
    WriteError(sb.ToString());

    //导向友好错误界面
    filterContext.Result = new RedirectToRouteResult(new RouteValueDictionary(
            new
            {
                controller = "Error",
                action = "Page404",
                returnUrl = filterContext.HttpContext.Request.Url,
                returnMessage = "页面不存在！"
            }
            ));

    //重要！！！告诉系统异常已经处理！！
    //如果没有这个步骤，系统还是会按照正常的异常处理流程做
    filterContext.ExceptionHandled = true;

    //base.OnException(filterContext);
}

1、记录错误信息

/// <summary>
/// 用于将错误信息输出到txt文件
/// </summary>
/// <param name="errorMessage">错误详细信息</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);
    }
}

网上大神写的，他分得比较的细：

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)//为什么要特别强调500 因为MVC处理HttpException的时候，如果为500 则会自动将其ExceptionHandled设置为true，那么我们就无法捕获异常
            {
                return;
            }
        }
        Exception exception = filterContext.Exception;            
        if (exception != null)
        {
            HttpException httpException = exception as HttpException;
            if (httpException != null)
            {
                //网络错误
                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);

                //写入日志 记录
                filterContext.ExceptionHandled = true;//设置异常已经处理
            }
            else
            {
                //编程或者系统错误，不处理，留给HandError处理
            }
        }                     
    }
}