TTestDataProvider - GetCaseParams is called 2 Times in GUI Mode

[Peter Meier 0]

Hello,
I encountered, that the TestDataprovider is created and GetCaseParams is called 2 times when running with GUI.

1st time when Fixtures are created
2nd time when Tests were performed.
How can I find out, that Tests are running (2nd time)?
Because only in this step it makes sense to create the Case params.
Creating the Case Params tooks some time, so i want to skip that process in the 1st time.

BTW: in ConsoleMode it is called one time.

Any Ideas?
Peter