vb.net - 在vb.net中datagridview的数据错误处理程序中识别datagridview抛出的异常是哪个单元格和类型

Question

以下是为处理 vb.net 中的 datagridview 错误而创建的事件处理程序。我想确定哪个单元格引发了错误并根据该错误显示正确的错误消息。例如，如果用户没有在 datagridview 的特定单元格中输入正确格式的日期，我想显示一条消息，指出日期不在正确的格式。以下是gridview初始化代码和错误处理程序

    Private Sub gridintialize()
    Dim Itemcode As New DataGridViewColumn
    Dim pkt As New DataGridViewColumn
    Dim loose As New DataGridViewColumn 
    Dim desp As New DataGridViewColumn
    Dim type As New DataGridViewColumn
    Dim uom As New DataGridViewColumn
    'Dim batch_no As New DataGridViewColumn
    Dim expiry_date As New DataGridViewColumn
    Dim qty As New DataGridViewColumn
    Dim unit_price As New DataGridViewColumn
    Dim disc As New DataGridViewColumn
    Dim grossamt As New DataGridViewColumn
    Dim disc_p As New DataGridViewColumn
    Dim netamt As New DataGridViewColumn

    With Itemcode
        .Name = "Itemcode"
        .ValueType = GetType(String)
        .HeaderText = "ITEM CODE"
        .Width = 195
        .CellTemplate = New DataGridViewTextBoxCell
    End With

    With desp
        .Name = "desc"
        .ValueType = GetType(String)
        .HeaderText = "Description"
        .Width = 300
        .CellTemplate = New DataGridViewTextBoxCell
    End With
    With type
        .Name = "type"
        .ValueType = GetType(String)
        .HeaderText = "Type"
        .Width = 50
        .CellTemplate = New DataGridViewTextBoxCell
    End With
    With uom
        .Name = "uom"
        .ValueType = GetType(String)
        .HeaderText = "UOM"
        .Width = 60
        .CellTemplate = New DataGridViewTextBoxCell
    End With
    With expiry_date
        .Name = "expiry"
        .ValueType = GetType(Date)
        .HeaderText = "Expiry"
        .Width = 70
        .CellTemplate = New DataGridViewTextBoxCell
    End With
    With qty
        .Name = "qty"
        .ValueType = GetType(Integer)
        .HeaderText = "Qty"
        .Width = 70
        .CellTemplate = New DataGridViewTextBoxCell
    End With
    With unit_price
        .Name = "unitp"
        .ValueType = GetType(Double)
        .HeaderText = "Unit Price"
        .Width = 70
        .CellTemplate = New DataGridViewTextBoxCell
    End With
    With disc
        .Name = "disc"
        .ValueType = GetType(Double)
        .HeaderText = "Discount"
        .Width = 70
        .CellTemplate = New DataGridViewTextBoxCell
    End With

    With disc_p
        .Name = "discp"
        .ValueType = GetType(Double)
        .HeaderText = "Disc(%)"
        .Width = 70
        .CellTemplate = New DataGridViewTextBoxCell

    End With
    With grossamt
        .Name = "gamt"
        .ValueType = GetType(Double)
        .HeaderText = "Gross Amount"
        .Width = 70
        .ReadOnly = True
        .CellTemplate = New DataGridViewTextBoxCell
    End With
    With netamt
        .Name = "namt"
        .ValueType = GetType(Double)
        .HeaderText = "Net Amount"
        .Width = 80
        .ReadOnly = True
        .CellTemplate = New DataGridViewTextBoxCell
    End With
    With pkt
        .Name = "pkt"
        .HeaderText = "PKT"
        .Width = 45
        .CellTemplate = New DataGridViewTextBoxCell
    End With
    With loose
        .Name = "loose"
        .HeaderText = "Loose"
        .Width = 45
        .CellTemplate = New DataGridViewTextBoxCell

    End With
    With dgsalesitem
        .Columns.Add(pkt)
        .Columns.Add(loose)
        .Columns.Add(Itemcode)
        .Columns.Add(desp)
        .Columns.Add(type)
        .Columns.Add(uom)
        .Columns.Add(expiry_date)
        .Columns.Add(qty)
        .Columns.Add(unit_price)
        .Columns.Add(grossamt)
        .Columns.Add(disc_p)
        .Columns.Add(disc)
        .Columns.Add(netamt)





    End With
End Sub

Private Sub dgsalesitem_DataError(ByVal sender As Object, ByVal e As   System.Windows.Forms.DataGridViewDataErrorEventArgs) Handles dgsalesitem.DataError
    MsgBox("Please enter data in correct format", vbInformation, "POS SYSTEM")

End Sub

Answer 1

您可以从e参数中获取所有这些信息：

Private Sub dgsalesitem_DataError(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewDataErrorEventArgs) Handles dgsalesitem.DataError
    Dim curException As Exception = e.Exception
    Dim curCell As DataGridViewCell = dgsalesitem(e.ColumnIndex, e.RowIndex)
End Sub

更新

要突出显示给定的单元格，您只需将ShowCellErrorsDataGridView 的属性设置为 true。或者影响给定单元格的格式，例如：

curCell.Style.BackColor = Color.Yellow 'Setting the background color of the cell to yello