ASP.NET Web服务项目中的VB6 .dll

Question

I got a strange problem recently. I have some VB6 .dll that I must use in my ASP.NET Web Service project. When I test the .dll in Console application - all works fine - I create an object and can use all methods as it should be. But when I start to use it in my Web Service I got a strange problem. When I'm creating an instance of dll class - it is created (after a long pause) but all properties instead of being nulls (as it happens when I test it in Console Application) in the debugger are set as "Function evaluation disabled because a previous function evaluation timed out. You must continue execution to reenable function evaluation". Something competely strange I've never seen before :) And at the same time in my client application (which actually invokes the service) I'm getting a connection reset.

Any suggestions?

Answer 1

If this DLL was created for a desktop environment, then it may simply not work in a server environment. It may depend on using a Windows message loop for synchronization, and may not be thread-safe at all (and it needs to be thread-safe in order to use it in a multithreaded server environment like ASMX).