@Phill
It seems I have managed to miss that one during my search.
@John
Maybe I was confused because
BootstrapperApplication.Engine.StringVariables.Contains("MyVariable");
returns true after
BootstrapperApplication.Engine.StringVariables["MyVariable"] = string.Empty;
is executed, but it returns false after
BootstrapperApplication.Engine.StringVariables["MyVariable"] = null;
is executed.
I knew I could test if a variable exists with the variables name alone, but as
I explicitly assigned it to string.Empty and the Contains() method returned
true I thought I had to test for an empty string.
I got it now. In the xml a string variable without content doesn't exist.
Thanks for your help.
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