DAX query works in PBI Desktop, not in DAX Studio

[texasmcse]

Trying to use DAX Studio to learn DAX.  I have queries (like below) that work as a measure in the PBI desktop app but always return syntax errors in DAX studio.  DAX studio is referencing the same PBIX.  I would appreciate any info on what I'm doing wrong.  

test = COUNTROWS (    

    SUMMARIZECOLUMNS(

MECM[OS],

    KEEPFILTERS( FILTER(ALL(MECM[OS]),

    SEARCH( "Windows", MECM[OS], 1, 0 ) >= 1 )))

)    

[Anonymous · Accepted solution]

Using DAX Studio requires the EVALUATE statement at the beginning of each query that you excecute. Additionally only queries that return a table is valid, so if you wish to test a measure that return a scalar value you could return the result in a table using a syntax like this:

EVALUATE

{"Result", COUNTROWS(.....)}

Br,

Magnus