在 DataGridView 中复制行

Question

The following code loads a tab delimited file into my DataGridView (loads 1 record from the data file). All this works perfectly, however, I need to duplicate this record X amount of times. Once the row is duplicated, I'll need to eventually edit some fields and write to a new file with the rows added.

I'v tried adding rows dynamically but it yells at me saying I can't because the data is bound.

Suggestions?

    Dim file As String = "Temp.txt"
    Dim path As String = "C:\Temp\"
    Dim ds As New DataSet
    Dim tbl As New DataTable

    Try
        If IO.File.Exists(IO.Path.Combine(path, file)) Then
            Dim ConStr As String = _
            "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & _
            path & ";Extended Properties=""Text;HDR=No;FMT=TabDelimited\"""
            Dim conn As New OleDb.OleDbConnection(ConStr)
            Dim da As New OleDb.OleDbDataAdapter("Select * from " & _
            file, conn)
            da.Fill(ds, "TextFile")
        End If
    Catch ex As Exception
        MessageBox.Show(ex.ToString)
    End Try

    DataGridView1.DataSource = ds.Tables(0)

Answer 1

You cannot add directly to a DataGridView which is databound because the data resides elsewhere and the DGV is simply displaying what is there. To add rows to a DataTable :

Dim dr = ds.Tables(0).NewRow()

This will create a new row with the columns defined for it based on the table. Add the data for the new item to it, then add it to the table:

dr.Item(0) = "something"   ' add to column one
... etc
ds.Tables(0)Rows.Add(dr)

You did not really need to create a DataSet for what you have so far. Alternative:

Private myDT As New DataTable      
...
da.Fill(myDT)

---

To literally clone the data for a row:

Dim dr As DataRow

For n As Integer = 0 To NumberOfDuplicates
    dr = myDT.NewRow              ' new DataRow
    For c As Integer = 0 To myDT.Columns.Count - 1   ' copy data from 0 to NewRow
        dr.Item(c) = myDT.Rows(0).Item(c)
    Next
    myDT.Rows.Add(dr)            ' add NewRow to datatable
Next n

Note that you need to create a new row for each clone, the inner loop copies the data from row(0) to each new one.

Answer 2

'Hope This helps DGV1 is the datagridview
'To copy Row
Private Sub CopyButton_Click(sender As System.Object, e As System.EventArgs) Handles CopyButton.Click
    CopyRowIndex = DGV1.CurrentRow.Index
End Sub

'To Paste Row
Private Sub PasteButton_Click(sender As System.Object, e As System.EventArgs) Handles PasteButton.Click
    PasteRowIndex = DGV1.CurrentRow.Index
    For index As Int32 = 0 To DGV1.ColumnCount - 1
        DGV1.Rows(CInt(PasteRowIndex)).Cells(index).Value = DGV1.Rows(CInt(CopyRowIndex)).Cells(index).Value
    Next

End Sub

'To Duplicate Rows
Private Sub DuplicateButton_Click(sender As System.Object, e As System.EventArgs) Handles DuplicateButton.Click
    CopyRowIndex = DGV1.CurrentRow.Index
    DGV1.Rows.Add()
    DuplicateRowIndex = DGV1.Rows.Count - 1
    For index As Int32 = 0 To DGV1.ColumnCount - 1
        DGV1.Rows(CInt(DuplicateRowIndex)).Cells(index).Value = DGV1.Rows(CInt(CopyRowIndex)).Cells(index).Value
    Next
End Sub