Question

I use LINQ in my web app.
I get back an iSingleResult result sequence.
I was wondering how I get the number of return rows in the sequence.
If I do:

if (FooterC.Count() != 0)
        {
            foreach (sp_GetFooterCResult dataRow in FooterC)
            {
                FooterText.Value = dataRow.ExtraText;
            }
        }
        else
        {
            FooterText.Value = "";
        }

I get an error:
“The query results cannot be enumerated more than once.”

How do I check how many rows were returned in the sequence?

The LINQ code as requested:

[Function(Name="dbo.sp_GetFooterC")]
public ISingleResult<sp_GetFooterCResult> sp_GetFooterC([Parameter(Name="Relevant", DbType="NVarChar(50)")] string relevant)
{
    IExecuteResult result = this.ExecuteMethodCall(this, ((MethodInfo)(MethodInfo.GetCurrentMethod())), relevant);
    return ((ISingleResult<sp_GetFooterCResult>)(result.ReturnValue));
}

Answer 1

What about this:

FooterText.Value = "";
foreach (var dataRow in FooterC)
{
   FooterText.Value = dataRow.ExtraText;
}

You don’t need to check for Length or Count when you use foreach.