Introduction

The events of any object can be traced, by use of a single class, through the use of .NET Reflection.

Have you tried to understand the patterns of raised events of a complicated object? I needed to work with a very capable, very full-featured grid control from a ISV’s popular control collection. It wasn’t very long before I was very puzzled trying to figure out which of the many events provided by the control were the ones I wanted, and in which order they were raised. I started to write individual event handlers for the events I was interested in, but there were so many I thought I’d be better off generating tracing event handlers for all the events using a nice editor macro. But it turned out there were over 260 events for this grid control, and they were declared at various levels of the class hierarchy. I looked for a better way.

.NET Reflection turned out to be a very easy way to get access to the definition of the class I was interested in—or any other class for that matter. It is a simple process to get all the events that a class declares, and then to attach handlers to any or all of the events.

This article presents the simple-but-general event hooking/tracing class I built, which is provided (with a demo) as a download.

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原文:http://www.codeproject.com/KB/cs/eventtracingviareflection.aspx