Why global.asax Application_Error method does not catch exceptions thrown by ASMX service?

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This is a known issue in .Net – Application_Error never fires for a web service. Not sure if there’s any reason it would be by design, but it just doesn’t work.

Jeff Atwood had a post (and follow-up) about this a few years ago, with the following ideas:

  • Put a try-catch block around each web service method
  • Use a facade design pattern and include the try-catch in parent objects
  • Write a custom SOAP extension or HTTPModule

The only one I care for is the first one, even though it seems like a lot of work.

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