Why Can't I Load SQLite.Interop.dll?

The Perplexing "SQLite.Interop.dll" Loading Failure

The error message, "Unable to load DLL 'SQLite.Interop.dll': The specified module could not be found," is a common yet frustrating problem for developers. Even after reinstalling NuGet packages and thorough debugging, this issue can persist, leaving developers stumped.

Many solutions have been proposed. Some developers have successfully resolved the problem by confirming the presence of SQLite.Interop.dll in both the application directory and the Global Assembly Cache (GAC). Others have reported success after deleting temporary files and restarting Visual Studio.

A particularly unusual solution, noted by a user working with version 1.0.88.0, involves the target IIS platform. While using a local 32-bit IIS instance in Visual Studio 2012, this user found that adding the SQLite.Interop.dll package to the main website project (even if the project didn't directly use SQLite classes) resolved the error.

This suggests that SQLite might use the entry assembly to determine the correct Interop version. This unexpected behavior underscores the fact that successful loading of SQLite.Interop.dll may depend on factors beyond its simple presence in the application's folder.

If you're facing this persistent error, try the suggested solutions. Also, verify that all referenced assemblies are current and compatible with your development environment. Through careful investigation and experimentation, you should be able to overcome this challenging DLL loading issue.

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