Download And Install The System.Collections.Immutable DLL

The .NET Framework can have different support for collections. In some versions the immutable collections are included and in others they are not.

If you attempt to run your Connector and you see an error message indicating that System.Collections.Immutable could not be found, you need to download that DLL and deploy it with the other Connector DLLs.

  1. Open your Project in Visual Studio.
  2. In Solution Explorer, right-click the Project and select Manage NuGet Packages. The dialog for managing NuGet packages displays.
  3. Select the Browse Tab or locate the Search field
  4. Make sure Include prerelease is not checked.
  5. Search for System.Collections.Immutable.
  6. Make sure the package is highlighted.
  7. In the panel on the right select Install.
  8. Accept all of the licenses.
  9. In some cases, you need version 1.1.36, which displays as an update to version 1.1.37. Install version 1.1.37 and then version 1.1.36 as an update.
  10. When deploying files for your Connector, include the System.Collections.Immutable.dll. See Installing A FCF Connector.

See Also

Fast Connector Framework (FCF)