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Visual Studio 2017–SQL Server Data Tools- Custom assemblies could not be loaded

On one of my SQL Server Reporting Services reports, I had to use some custom logic. Instead of embedding the code directly into the report, I decided to create a separate assembly which makes it easier to test and debug this code.

After importing the assembly in my Visual Studio 2017 Reporting Services project, I couldn’t load the Report Designer preview window anymore. Instead I got the following error message:

An error occured during local report processing.

The definition of the report ‘/samplereport’ is invalid.

Error while loading code module: ‘Sample.Barcode, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null’. Details: Could not load file or assembly ‘Sample.Barcode, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null’ or one of its dependencies. The system cannot find the file specified.

To fix this I had to copy the DLL to the following location:

C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\Common7\IDE\CommonExtensions\Microsoft\SSRS
Remark: Note that this DLL is loaded only once in Visual Studio. If you change something to this DLL, you have to close and open Visual Studio again.
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