Troubleshooting the "Unable to load DLL 'SQLite.Interop.dll'" Error
Many developers encounter the frustrating "Unable to load DLL 'SQLite.Interop.dll'" error. This guide provides a comprehensive understanding of the problem and its solution.
This error frequently arises when using the SQLite.Interop.dll module (installed via NuGet) within Visual Studio 2010 on a 64-bit Windows 7 system. The problem persists even in debug and release modes, and continues outside the Visual Studio environment. Interestingly, a system logoff and logon sometimes resolves the issue temporarily, highlighting the intermittent nature of this error.
The Solution: A Simple Fix
The most effective solution involves installing the SQLite.Interop.dll NuGet package in both the DLL project and the main application project. This is crucial even if the main project doesn't directly utilize any SQLite classes.
Why This Works
The underlying cause appears to be related to how SQLite determines the correct Interop module version. By installing the package in both projects, you ensure the correct version is readily accessible during the assembly resolution process. This straightforward approach has proven successful for numerous developers facing this DLL loading issue.
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