Why does this code generate a NotSupportedException?

Posted by edg on Stack Overflow See other posts from Stack Overflow or by edg
Published on 2010-04-27T08:19:37Z Indexed on 2010/04/27 8:23 UTC
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This is fine

string foo(string f) { return f; }
string bar = foo("");
var item = (from f in myEntities.Beer
            where f.BeerName == bar
            select f).FirstOrDefault();

and this is fine

string foo(string f) { return f; }
string bar = "";
var items = from f in myEntities.Beer
            where f.BeerName == foo(bar)
            select f;

So why does this throw System.NotSupportedException?

string foo(string f) { return f; }
string bar = "";
var item = (from f in myEntities.Beer
            where f.BeerName == foo(bar)
            select f).FirstOrDefault();

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