Using class library in SSIS Projects without GAC installation

I don’t want to add custom assembly in GAC. Here is my research.

There is no direct way to do that from integration services packages, because the only workaround is using CurrentDomain_AssemblyResolve function – loading an assembly from a location instead of installing it into GAC.

There are 3 ways for using custom dll’s on deployment:

Assigning DLL’s to the GAC
Using the AssemblyResolve Function
Copy all Dll’s to the sql server DTS Assemblies folder (example for SQL Server 2008: C:\Program Files\Microsoft SQL Server\100\DTS\Binn) and to the .Net framework assemblies folder.

There could be an interesting workaround by using a Web Service instead of direct dll, so you can create a web service which contains the methods you are using and add a Web reference instead of a Local assembly

Here is an example.

This might be your starting point.

Using custom DLL in script task

Resources

https://docs.microsoft.com/en-us/answers/questions/92003/unable-to-reference-custom-class-library-in-ssis-s.html

https://www.codeproject.com/Articles/895028/Refering-dlls-in-SSIS-Script-Task

https://www.dotnetspider.com/resources/45645-How-to-use-custom-DLL-in-SSIS-Package.aspx