Question

I am struggling to get the code right for my following requirement:

Requirement:
To have the name of datacolumns from a datatable in an array Except the ones whose Ordinal exist in lstSnapshotExcludingCols i.e. a list of integers.

Can someone please help me in getting the expected results. I am using the following code, but it returns all of the datacolumns and does not skip anything.

Dim columnNames = ldtCurrentData.Columns.Cast(Of DataColumn)()
                  .SkipWhile(Function(column) 
                             lstSnapshotExcludingCols.Contains(column.Ordinal))
                  .Select(Function(column) column.ColumnName).ToArray()

I have the similar issue while selecting the data from a datarow:

Dim fields = row.ItemArray.SkipWhile(Function(value, index) lstSnapshotExcludingCols.Contains(index))

Answer 1

Don’t user SkipWhile(...). A simple Where(...) will do the trick:

Dim columnNames = ldtCurrentData.Columns.Cast(Of DataColumn)()
                 .Where(Function(column) 
                    Not lstSnapshotExcludingCols.Contains(column.Ordinal))
                 .Select(Function(column) column.ColumnName).ToArray()