DLL hell with SQLite

Question

Some of our users are getting an issue with the version of sqlite.interop.dll that is being loaded at runtime, and it\'s a real head scratcher.

Background: A WPF applica

Answer 1

SQLite.Interop.dll is loaded in a tricky way.
By using any reflector you can inspect UnsafeNativeMethods.Initialize() method in System.Data.SQLite.dll by yourself.
Some notes to demonstrate, that it is possible to get something interesting by reflection(1.0.89 version):

• If SQLite.Interop.dll is placed in base directory - it will be loaded
• PreLoadSQLite_BaseDirectory and PreLoadSQLite_UseAssemblyDirectory environment variables can affect loading process
• SQLite.Interop.dll can be searched in predifined subfolders(x86, x64, Win32, Itanium, WinCE)
• Trace.WriteLine is called to inform selected path(not always)

Source code is also available.