How Can Fusion Logging Help Troubleshoot .NET Assembly Bind Failures?

Diagnosing .NET Assembly Load Errors Using Fusion Logging

.NET applications sometimes fail to load required assemblies, making troubleshooting challenging. Fusion logging (also known as assembly bind failure logging) provides detailed information to pinpoint these issues.

Activating Fusion Logging

Enable Fusion logging with these steps:

1. Access the Windows Registry at this location:

   <code>HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Fusion</code>

2. Create or modify the following DWORD values (set to 1) and string value:

   <code>ForceLog: 1
   LogFailures: 1
   LogResourceBinds: 1
   EnableLog: 1
   LogPath: "C:\FusionLog\"  (or your desired log directory, including the trailing backslash)</code>

Important Considerations:

• Verify the log directory exists before enabling logging. The trailing backslash in the LogPath value is crucial.
• A restart of the application is needed to apply the registry changes.
• Disable Fusion logging after troubleshooting to avoid excessive log file generation.

Example Registry Entries:

<code>[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Fusion]
"ForceLog"=dword:00000001
"LogFailures"=dword:00000001
"LogResourceBinds"=dword:00000001
"EnableLog"=dword:00000001
"LogPath"="C:\FusionLog\"</code>

By implementing these steps, you'll generate Fusion logs containing valuable data for resolving assembly binding problems in your .NET applications.

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