如何以編程方式設置DataGridView單元的值？

Question

如果滿足某些條件，我將嘗試清除單元格。 但是它不起作用。

UPDATE

 Private Sub DataGridView1_CellLeave(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellLeave
        Dim laspac As Int16 = DataGridView1.Columns("LASPAC").Index

        If e.ColumnIndex = laspac And DataGridView1.Rows(e.RowIndex).Cells("CType").Value.ToString.Trim() = "B" Then
            Dim B_LASPAC As DataGridViewCell = DataGridView1.Rows(e.RowIndex).Cells("LASPAC")
            Dim A_LASPAC As DataGridViewCell = DataGridView1.Rows(e.RowIndex - 1).Cells("LASPAC")
            If B_LASPAC.Value.ToString.Trim.Length <> 0 Then

                If Convert.ToDecimal(B_LASPAC.Value) + Convert.ToDecimal(A_LASPAC.Value) > 0 Then

                    B_LASPAC.Value = ""


                End If
            End If


        End If
    End Sub

Answer 1

非常簡單，只需傳遞RowIndex和ColumnIndex

例如。

Dim rowId = 0
Dim colId = 1

DataGridView1(colId, rowId).Value = "HELLO"

所以，就您而言...

If ... Then
    DataGridView1(e.ColumnIndex, e.RowIndex).Value = ""
End If

Answer 2

我必須使用B_LASPAC.EditedFormattedValue.ToString()而不是B_LASPAC.Value.ToString()才能在離開單元格時獲取單元格的值，而且我意識到我需要使用DataGridView1.EndEdit()結束DataGridView的EditMode。 DataGridView1.EndEdit() ，在我設置單元格B_LASPAC.Value = ""的新值之前

 Private Sub DataGridView1_CellLeave(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellLeave
        Dim laspac As Int16 = DataGridView1.Columns("LASPAC").Index

        If e.ColumnIndex = laspac And DataGridView1.Rows(e.RowIndex).Cells("CType").Value.ToString.Trim() = "B" Then
            Dim B_LASPAC As DataGridViewCell = DataGridView1.Rows(e.RowIndex).Cells("LASPAC")
            Dim A_LASPAC As DataGridViewCell = DataGridView1.Rows(e.RowIndex - 1).Cells("LASPAC")
            Dim str As String = DataGridView1.Rows(e.RowIndex).Cells("LASPAC").EditedFormattedValue.ToString()
            If B_LASPAC.EditedFormattedValue.ToString.Trim.Length <> 0 Then
                If Convert.ToDecimal(B_LASPAC.EditedFormattedValue.ToString()) + Convert.ToDecimal(A_LASPAC.EditedFormattedValue.ToString()) > 0 Then

                    DataGridView1.EndEdit()
                    B_LASPAC.Value = ""

                End If
            End If
        End If
    End Sub