计算特定的数据表列

Question

How to count datatable columns (created dynamically) that has the same first two characters in the header? Here's my code so far but is not working.

    For col As Integer = 3 To dt.Columns.Count - 1
        Dim cntLE, cntUE As Integer
        If dt.Columns(col).ColumnName.Substring(0, 2) = "LE" Then
            cntLE = dt.Columns.Count
        ElseIf dt.Columns(col).ColumnName.Substring(0, 2) = "UE" Then
            cntUE = dt.Columns.Count
        End If
    Next

Answer 1

It's because you are assigning the entire column count (ie dt.Columns.Count ) to the counters, instead of increment them by 1 if found.

Try this.

For col As Integer = 3 To dt.Columns.Count - 1
    Dim cntLE, cntUE As Integer
    If dt.Columns(col).ColumnName.Substring(0, 2) = "LE" Then
        cntLE = cntLE + 1
    ElseIf dt.Columns(col).ColumnName.Substring(0, 2) = "UE" Then
        cntUE = cntUE + 1
    End If
Next