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MVC四大筛选器—ExceptionFilter
该筛选器是在系统出现异常时触发，可以对抛出的异常进行处理。所有的ExceptionFilter筛选器都是实现自IExceptionFilter接口
public interface IExceptionFilter { void OnException(ExceptionContext filterContext); }
实现OnException方法来实现对异常的自定义处理
MVC4中实现了默认的异常处理机制，源码如下
public virtual void OnException(ExceptionContext filterContext) { if (filterContext == null) { throw new ArgumentNullException("filterContext"); } if (filterContext.IsChildAction) { return; } // If custom errors are disabled, we need to let the normal ASP.NET exception handler // execute so that the user can see useful debugging information. if (filterContext.ExceptionHandled || !filterContext.HttpContext.IsCustomErrorEnabled) { return; } Exception exception = filterContext.Exception; // If this is not an HTTP 500 (for example, if somebody throws an HTTP 404 from an action method), // ignore it. if (new HttpException(null, exception).GetHttpCode() != 500) { return; } if (!ExceptionType.IsInstanceOfType(exception)) { return; } string controllerName = (string)filterContext.RouteData.Values["controller"]; string actionName = (string)filterContext.RouteData.Values["action"]; HandleErrorInfo model = new HandleErrorInfo(filterContext.Exception, controllerName, actionName); filterContext.Result = new ViewResult { ViewName = View, MasterName = Master, ViewData = new ViewDataDictionary<HandleErrorInfo>(model), TempData = filterContext.Controller.TempData }; filterContext.ExceptionHandled = true; filterContext.HttpContext.Response.Clear(); filterContext.HttpContext.Response.StatusCode = 500; // Certain versions of IIS will sometimes use their own error page when // they detect a server error. Setting this property indicates that we // want it to try to render ASP.NET MVC‘s error page instead. filterContext.HttpContext.Response.TrySkipIisCustomErrors = true; }
Application_Start中将HandleErrorAttribute添加到全局筛选器GlobalFilterCollection中，系统即会对异常进行对应的处理。
我们现在实现一个自定义的异常处理筛选器，在处理完后记录异常信息至日志文件中
public class MyExceptionHandleAttribute : HandleErrorAttribute { public MyExceptionHandleAttribute() : base() { } public void OnException(ExceptionContext filterContext) { base.OnException(filterContext); //记录日志 log.Info(filterContext.Exception); } }
在GlobalFilterCollection添加MyExceptionHandleAttribute 即可使用自定义的异常筛选器来处理
MVC四大筛选器—ExceptionFilter
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