c# - Select items from List A where the property is not in List B -

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i have list<broadcast> , broadcast object has property called guid. need find broadcast objects in list guid property not item in list<guid>. i've found solution except(); it's not working me.

broadcasts.where(x => x.guid).except(readbroadcasts);

what doing wrong?

here way can : 

list<guid> excludeguid = ..... // init guids want exclude list<broadcast> result = broadcasts.where(x => !excludeguid.contains(x.guid)).tolist() ;

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