CODEWITHSUNDEEP
c#winforms
JohnB
JohnB

Reputation: 4379

Why is my Winforms Application MessageFilter not dispatching messages?

I have a .Net Winforms application. I'm trying to add message filtering via IMessageFilter.

The filter gets added correctly and I am intercepting messages. For purposes I am returning false, so all messages should dispatch and processed.

However, once the filter starts intercepting messages, the messages do not get dispatched to normal filtering/processing.

I'm not sure what's going here. Is this the correct way to intercept/filter messages in a Winforms application? I would like to be able to use this filter to examine information about the winforms controls receiving the events.

Here is my sample MessageFilter class:

public class InspectorMessageFilter : IMessageFilter
{
    public bool PreFilterMessage(ref Message message)
    {
        return false;
    }
}

Here is the code to instantiate and add the filter:

var filter = new InspectorMessageFilter();
Application.AddMessageFilter(filter);

Upvotes: 0

Views: 231

Answers (1)

JohnB
JohnB

Reputation: 4379

I changed my Prefilter definition to:

public class InspectorMessageFilter : IMessageFilter
{
    public bool IMessageFilter.PreFilterMessage(ref Message message)
    {
        return false;
    }
}

It all works now!

Upvotes: 0

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