The least-cost way to return a one-row IEnumerable object?

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

The function must return a IEnumerable object with one row (any data). I have
the following code. Any less cost way?

IEnumerable^ udf()
{
DataTable dt;
dt.Columns->Add("Test");
dt.Rows->Add(1);
return dt.Rows;
}
 
How about

IEnumerable^ udf()
{
return gcnew cli::array<Object^> { yourOneAndOnlyElement };
}
 
nick said:
I am thinking some constant object so there is no runtime gcnew....?
Click to expand...

IEnumerable^ is a tracking handle. Tracking handles can only refer to
objects on the garbage collected heap. Objects on the garbage collected heap
are created with gcnew (or boxing, which is not relevant here). So the
answer to your question is: No, there is no way to avoid creating an object
on the gc heap if you want to return IEnumerable^.

Marcus
 
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