C# – Could not load file or assembly ‘Microsoft.Practices.EnterpriseLibrary.Common’ or one of its dependencies

asp.netcenterprise-librarynugetnuget-package

I have searched google for this and could not find the solution to the problem.

My Website references DAL (custom dll) which references Enterprise Library Data Access Components.

I have added the Enterprise Library from the NuGet Package Manager and when I try to build the Website this compilation error pops up:

Error 44 Could not load file or assembly 'Microsoft.Practices.EnterpriseLibrary.Common' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference

I have tried setting the Copy Local = True in the DAL for the Enterprise Library dlls and the dlls are transferred to the Bin directory of the website along with DAL dll, but still the error pops up.

Can anyone guide me on this….

Best Answer

The problem is that the DLL that you are using and the one that is referenced in your project are different. I'm not sure what the difference in the manifest is, but it could be version and/or public key.

You have a couple of things to try:

Open the properties for the DLL reference in your project and set Version Specific to false.
Remove the reference, delete the DLL from the bin folder, and re-add the reference.
You could also have a different/incorrect version in your GAC. In order to make sure that you are always using a specific, known version create an assemblies folder relative to your project directory, copy the dll to that directory, and add a reference to the DLL in the assemblies directory rather than one in GAC or elsewhere on your machine. This will ensure that only the specific version that you have targeted for the application will be used rather than any version that is updated on your machine at a later time.

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C# – How to get the path of the assembly the code is in

I've defined the following property as we use this often in unit testing.

public static string AssemblyDirectory
{
    get
    {
        string codeBase = Assembly.GetExecutingAssembly().CodeBase;
        UriBuilder uri = new UriBuilder(codeBase);
        string path = Uri.UnescapeDataString(uri.Path);
        return Path.GetDirectoryName(path);
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The Assembly.Location property sometimes gives you some funny results when using NUnit (where assemblies run from a temporary folder), so I prefer to use CodeBase which gives you the path in URI format, then UriBuild.UnescapeDataString removes the File:// at the beginning, and GetDirectoryName changes it to the normal windows format.

C# – The located assembly’s manifest definition does not match the assembly reference

The .NET Assembly loader:

is unable to find 1.2.0.203
but did find a 1.2.0.200

This assembly does not match what was requested and therefore you get this error.

In simple words, it can't find the assembly that was referenced. Make sure it can find the right assembly by putting it in the GAC or in the application path. Also see https://docs.microsoft.com/archive/blogs/junfeng/the-located-assemblys-manifest-definition-with-name-xxx-dll-does-not-match-the-assembly-reference.

Best Answer

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C# – The located assembly’s manifest definition does not match the assembly reference

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