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using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Web.Mvc.Properties;
namespace System.Web.Mvc
{
[SuppressMessage("Microsoft.Performance", "CA1813:AvoidUnsealedAttributes", Justification = "This attribute is AllowMultiple = true and users might want to override behavior.")]
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, Inherited = true, AllowMultiple = true)]
public class HandleErrorAttribute : FilterAttribute, IExceptionFilter
{
private const string DefaultView = "Error";
private readonly object _typeId = new object();
private Type _exceptionType = typeof(Exception);
private string _master;
private string _view;
public Type ExceptionType
{
get { return _exceptionType; }
set
{
if (value == null)
{
throw new ArgumentNullException("value");
}
if (!typeof(Exception).IsAssignableFrom(value))
{
throw new ArgumentException(String.Format(CultureInfo.CurrentCulture,
MvcResources.ExceptionViewAttribute_NonExceptionType, value.FullName));
}
_exceptionType = value;
}
}
public string Master
{
get { return _master ?? String.Empty; }
set { _master = value; }
}
public override object TypeId
{
get { return _typeId; }
}
public string View
{
get { return (!String.IsNullOrEmpty(_view)) ? _view : DefaultView; }
set { _view = value; }
}
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;
}
}
}
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