Why Does My C# Unit Test Fail with a 'Located Assembly's Manifest Definition Mismatch' Error?

C#unit test failure: The definition of the program set list is not matched with

Question

When testing the unit test of the C# Windows Forms application, the following errors occur:

Although only version 1.2.0.203 is referenced in the project, the error is referenced by version 1.2.200. How to determine the source of this reference and which tools can help search for the old assembly version on the hard disk?

<code>System.IO.FileLoadException: 无法加载文件或程序集“Utility, Version=1.2.0.200, Culture=neutral, PublicKeyToken=764d581291d764f7”或它的某一个依赖项。找到的程序集的清单定义与程序集引用不匹配。</code>

Answer

.NET program set the loader facing two challenges:

It cannot find the 1.2.0.203 version of the referenced assembly set.

It found version 1.2.0.200, but its list definition and expected reference conflict.
• To solve this problem, make sure the correct program set version is available. This can be achieved by placing the assembly in the global assembly cache (GAC) or application path.

To add the program set to the GAC, please execute the following command:

In addition, please refer to the Microsoft document (

https://www.php.cn/link/56DE534CF589F6D0CA09630DB803ba00

<code>gacutil /i "path/to/my.dll"</code>

. This document may be updated, it is recommended to search the latest related Microsoft documentation.

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