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Helpers classes for centralized exception handling in a VSTO add-in using PostSharp.
using System;
using log4net;
using PostSharp.Laos;
// http://exceptionalcode.wordpress.com/2010/02/17/centralizing-vsto-add-in-exception-management-with-postsharp/
namespace Helpers.Vsto.ErrorHandling
{
[Serializable]
public sealed class ExecutionEntryPointAttribute : OnExceptionAspect
{
private const string DefaultLogMessage = "Unhandled exception.";
public ExecutionEntryPointAttribute()
: this(true, true)
{
}
public ExecutionEntryPointAttribute(bool triggerEvents, bool logExceptions)
:this (true, true, DefaultLogMessage)
{
}
public ExecutionEntryPointAttribute(bool triggerEvents, bool logExceptions, string logMessage)
{
this.TriggerEvents = triggerEvents;
this.LogExceptions = logExceptions;
this.LogMessage = logMessage;
}
public bool TriggerEvents { get; set; }
public bool LogExceptions { get; set; }
public string LogMessage { get; set; }
public override void OnException(MethodExecutionEventArgs eventArgs)
{
Type source = eventArgs.Method.DeclaringType;
if (this.LogExceptions)
{
ILog log = LogManager.GetLogger(source);
log.Fatal(this.LogMessage, eventArgs.Exception);
}
if (this.TriggerEvents)
{
ExecutionEntryPoint.ReportUnhandledException(source, eventArgs.Exception);
}
}
}
public sealed class VstoUnhandledExceptionEventArgs : EventArgs
{
internal VstoUnhandledExceptionEventArgs(Exception exception)
{
if (exception == null)
{
throw new ArgumentNullException("exception");
}
this.Exception = exception;
}
public Exception Exception { get; private set; }
}
public static class ExecutionEntryPoint
{
public static event EventHandler<VstoUnhandledExceptionEventArgs> UnhandledException;
internal static void ReportUnhandledException(Type sender, Exception exception)
{
if (sender == null)
{
throw new ArgumentNullException("sender");
}
if (exception == null)
{
throw new ArgumentNullException("exception");
}
OnUnhandledException(sender, new VstoUnhandledExceptionEventArgs(exception));
}
private static void OnUnhandledException(object sender, VstoUnhandledExceptionEventArgs e)
{
var handler = UnhandledException;
if (handler != null)
{
handler(sender, e);
}
}
}
}
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