MVC TIP4：为捕获路由及通用异常处理

对于未路由到的URL，可以如下处理。

1：首先，准备控制器

public class ErrorController : Controller
{
    public ActionResult Index(string error)
    {
        ViewData["Title"] = "WebSite 网站内部错误";
        ViewData["Description"] = error;
        return View("Index");   //全部路由到Error下的Index视图
    }
    public ActionResult HttpError404(string error)
    {
        ViewData["Title"] = "HTTP 404- 无法找到文件";
        ViewData["Description"] = error;
        return View("Index");
    }
    public ActionResult HttpError500(string error)
    {
        ViewData["Title"] = "HTTP 500 - 内部服务器错误";
        ViewData["Description"] = error;
        return View("Index");
    }
    public ActionResult General(string error)
    {
        ViewData["Title"] = "HTTP 发生错误";
        ViewData["Description"] = error;
        return View("Index");
    }  
}

2：Error下的Index视图

代码：

3：在Global.aspx中进行处理

添加如下方法：

protected void Application_Error(object sender, EventArgs e)
{
    Response.Clear();
    Exception exception = Server.GetLastError();
    HttpException httpException = exception as HttpException;
    RouteData routeData = new RouteData();
    routeData.Values.Add("controller", "Error");
    if (exception == null)
    {
        routeData.Values.Add("action", "Index");
    }
    else if (httpException == null)
    {
        routeData.Values.Add("action", "Index");
    }
    else
    {
        switch (httpException.GetHttpCode())
        {
            case 404:
                routeData.Values.Add("action", "HttpError404");
                break;
            case 500:
                routeData.Values.Add("action", "HttpError500");
                break;
            default:
                routeData.Values.Add("action", "General");
                break;
        }
    }
    // Pass exception details to the target error View.  
    routeData.Values.Add("error", exception.Message);
    // Clear the error on server.  
    Server.ClearError();
    // Call target Controller and pass the routeData.  
    IController errorController = new ErrorController();
    errorController.Execute(new RequestContext(new HttpContextWrapper(Context), routeData));
}