Introduction:

The “Could not load file or assembly” exception is a common issue faced by developers and IT professionals, impacting the loading of assemblies in** .NET PDF Library** applications. This document outlines the various scenarios in which this error can occur and provides detailed steps to resolve these issues.

Possible Scenarios and Resolutions:

1. Missing Assembly

   • Cause: The required assembly is not present in the bin directory or the Global Assembly Cache (GAC).
   • Resolution: Ensure that the assembly is included in the project references and is copied to the output directory during the build process.

2. Version Mismatch

   • Cause: The application is referencing an assembly version that is not available.
   • Resolution: Update the project references to match the available version or update the GAC with the correct version.

3. Incorrect Architecture

   • Cause: There is a mismatch between the processor architecture of the application and the assembly (e.g., x86 vs. x64).
   • Resolution: Modify the project’s platform target to match the architecture of the referenced assembly. This can be done through Configuration Manager in Visual Studio.

4. Application Pool Configuration

   • Cause: IIS application pool settings conflict with the assembly architecture.
   • Resolution: Adjust the “Enable 32-Bit Applications” setting in the IIS Application Pool to ensure compatibility.

5. Path or Permissions Issue

   • Cause: Insufficient permissions or incorrect path settings prevent the assembly from loading.
   • Resolution: Verify access permissions and ensure that the paths in the application configuration are correct. Ensure the assembly file is accessible to the application.

6. Strong-Naming Issues

   • Cause: The assembly is strong-named, but the name does not match the expected strong name.
   • Resolution: Ensure that the assembly is signed with the correct strong name and the identity matches the one defined in the application configuration.

7. Cache and Temporary Files

   • Cause: Corrupted or outdated cache and temporary files can interfere with assembly loading.
   • Resolution: Clear the cache in directories such as “Temporary ASP.NET Files” and restart the server or development environment to refresh the files.

8. Binding Redirects

   • Cause: Missing binding redirects in the application configuration can prevent the application from loading the correct assembly version.
   • Resolution: Add the necessary binding redirects in app.config or web.config to ensure that older versions are redirected to the correct one.

9. Corrupt Assembly File

   • Cause: The assembly file itself is corrupt or invalid.
   • Resolution: Replace the corrupt assembly with a valid, known-good version to restore functionality.

Conclusion
I hope you enjoyed learning on how to resolve “assembly” exceptions in .Net Pdf Library.

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