Expression.Evaluate to examine value of parameter?

[tswm00]

Is it possible to use Expression.Evaluate to (dynamically) examine the value of a Power Query Parameter?

Trying the below results in null despite the parameter "InitFileGLOBAL" has a value.

let

  ParameterName = "InitFileGLOBAL",

  Source = Expression.Evaluate(ParameterName, #shared)

in

  Source

[Vijay_A_Verma]

You have to just say

let

   Source = InitFileGLOBAL

in

  Source

[tswm00]

Thanks! I was unclear. I want to examine value dynamically and thus select what parameter to examine based on a string value representing the name of the parameter.

[Vijay_A_Verma]

The way you have done is right. Check whether InitFileGLOBAL contains a value or not in Parameter screen. 

The null will come when there is no value in current value.

[tswm00]

Thanks for your response!

I am trying to accomplish this in Power Query Online (Datamart)

When testing the same thing i Power Query for Excel it works as a charm so the question is if this is a permanent limitation in Power Query Online?

Online doesnt like the #share object or any other dynamic values in my queries (that works fine in the Excel version) so perhaps i need to rethink the design fundamentally.

[tswm00]

Perhaps Expression.Evaluate is not the right way?

Examining #share results in: