错误BC30456：“ ElementAtOrDefault”不是“ System.Data.EnumerableRowCollection（Of System.Data.DataRow）”的成员

Question

The compiler on the server throws the error "'ElementAtOrDefault' is not a member of 'System.Data.EnumerableRowCollection(Of System.Data.DataRow)'" at the line:
Dim dr As DataRow = clientDataTable(0)
in my .ashx file. It also threw this error when I previously tried
Dim strFirstName As String = clientDataTable(0)("FirstName").ToString()
Am I declaring the DataRow incorrectly, or is there something else I'm missing?

Answer 1

Try using

clientDataTable.Rows(0)

Rather than just using (clientDataTable(0)) this will make sure you actually get rows back.