On Thu, 2010-06-03 at 17:54 -0700, ds wrote:
> Can someone explain why this fails with a "System.ArgumentException:
> MemberAccess" exception:
>
> List<byte[]> document = (from d in db.DocumentBlobs
> where d.DocumentBlobID == Request.QueryString["id"]
> select d.Blob).ToList();
>
> but why the following works just fine?
>
> string qs = Request.QueryString["id"];
>
> List<byte[]> document = (from d in db.DocumentBlobs
> where d.DocumentBlobID == qs
> select d.Blob).ToList();
This is because of the expression tree that the compiler creates. The
former contains a MemberExpression (presumably for accessing the
Request.QueryString property), but ExpressionType.MemberAccess isn't
supported by SqlProvider.cs:GetLiteral():
//case ExpressionType.MemberAccess:
// break;
The result is an exception.
I've filed this as:
http://code.google.com/p/dblinq2007/issues/detail?id=260
- Jon
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