网站项目异常_系统级捕获_404页面跳转_初步认识

前言：本人对异常的捕获是个初学者，今天刚有所接触，做个简要记录，以后会逐步完善，不足之处请批评指正：

项目中使用C#代码直接抛出一个异常：

 throw new ArgumentException("错误的压缩级别");

A-代码捕捉异常处理：.net Web项目，Global项目启动页，项目异常处理代码：

protected void Application_Error(object sender, EventArgs e)
        {
            if (this.Request.FilePath == "/")
            {
                this.Server.ClearError();
                return;
            }
            Exception error = this.Server.GetLastError();
            Exception exception = error.InnerException ?? error;
            if (exception is HttpException)
            {
                if ((exception as HttpException).GetHttpCode() == HttpStatusCode.NotFound.GetValue())
                {
                    return;
                }
            }
            _Log.Error("
Client IP：" + this.Request.UserHostAddress + "
Error Page：" + this.Request.Url, exception);
            HttpContext context = this.Context;
            string userName = context.User == null ? "未登录用户" : context.User.Identity.Name;
            string referrer = Request.UrlReferrer == null ? string.Empty : this.Request.UrlReferrer.AbsoluteUri;
            //this.Context.Items.Add("exception", exception);// <customErrors redirectMode="ResponseRewrite" defaultRedirect="~/404.html" mode="On">
        }

B：配置文件项目异常404跳转处理：.net Web项目，web.config配置异常捕获：

 <httpErrors>
      <remove statusCode="404" subStatusCode="-1" />
      <error statusCode="404" prefixLanguageFilePath="" path="/404.html" responseMode="ExecuteURL" />
      <error statusCode="404" path="/404.html" responseMode="ExecuteURL" subStatusCode="1" />
      <error statusCode="404" path="/fr/404.html" responseMode="ExecuteURL" subStatusCode="2" />
      <error statusCode="404" path="/es/404.html" responseMode="ExecuteURL" subStatusCode="3" />
      <error statusCode="404" path="/ja/404.html" responseMode="ExecuteURL" subStatusCode="4" />
      <error statusCode="404" path="/ar/404.html" responseMode="ExecuteURL" subStatusCode="5" />
      <error statusCode="404" path="/de/404.html" responseMode="ExecuteURL" subStatusCode="6" />
      <error statusCode="404" path="/it/404.html" responseMode="ExecuteURL" subStatusCode="7" />
    </httpErrors>