Question

我尝试将RowsAdded和CellFormatting处理程序添加到我的项目中。我似乎已经清除了CellFormatting处理程序中的所有错误，但我的RowsAdded正在提出一些我无法弄清楚的错误。

没有为参数＆＃39; rowCount＆＃39;指定参数＆＃39; Public Sub   新建（rowIndex As Integer，rowCount As Integer）＆＃39;

＆＃39; AddressOf＆＃39;表达式无法转换为＆＃39;整数＆＃39;因为＆＃39;整数＆＃39;不是委托类型

我的代码：

Private Sub InitializeDataGridView()
    Try
        ' Set up the DataGridView. 
        With Me.DataGridView1
            ' Automatically generate the DataGridView columns.
            .AutoGenerateColumns = True

            ' Set up the data source.
            .DataSource = dt

            ' Automatically resize the visible rows.
            .AutoSizeRowsMode = DataGridViewAutoSizeRowsMode.DisplayedCellsExceptHeaders

            ' Set the DataGridView control's border.
            .BorderStyle = BorderStyle.Fixed3D

            ' Put the cells in edit mode when user enters them.
            .EditMode = DataGridViewEditMode.EditOnKeystrokeOrF2

            ' Disables Add New Row
            .AllowUserToAddRows = False

            '.AllowUserToOrderColumns = False
            For Each column As DataGridViewColumn In DataGridView1.Columns
                column.SortMode = _
                DataGridViewColumnSortMode.Programmatic
            Next

            AddHandler Me.DataGridView1.CellFormatting, New DataGridViewCellFormattingEventHandler(AddressOf OnCellFormatting)
            AddHandler Me.DataGridView1.RowsAdded, New DataGridViewRowsAddedEventArgs(AddressOf OnRowsAdded)

        End With

    Catch ex As SqlException
        MessageBox.Show(ex.ToString, _
            "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
        System.Threading.Thread.CurrentThread.Abort()
    End Try
End Sub

和

Private Sub OnCellFormatting(ByVal sender As Object, ByVal e As DataGridViewCellFormattingEventArgs) Handles DataGridView1.CellFormatting
    'If e.ColumnIndex = DataGridView1.Columns("Contact").Index Then
    '    e.FormattingApplied = True
    '    Dim row As DataGridViewRow = DataGridView1.Rows(e.RowIndex)
    '    e.Value = String.Format("{0} : {1}", row.Cells("ContactName").Value, row.Cells("Phone").Value)
    'End If
End Sub
Private Sub OnRowsAdded(ByVal sender As Object, ByVal e As DataGridViewRowsAddedEventArgs) Handles DataGridView1.RowsAdded
    'For i As Integer = 0 To e.RowIndex - 1
    '    Dim row As DataGridViewRow = DataGridView1.Rows(e.RowIndex + i)
    '    row.Cells("Contact").Value = String.Format("{0} : {1}", row.Cells("ContactName").Value, row.Cells("Phone").Value)
    'Next
End Sub

关于错误，我没有在任何地方使用rowCount，所以我可能需要吗？

为什么我认为我使用整数作为委托类型？

我检查过，我没有任何公共变量rowCount或rowIndex。

根据答案我删除了Sub InitializeDataGridView（）中的两行似乎可以解决我的错误。然而，答案还指出Args应该是Handler。所以我将Private Sub OnRowsAdded改为

Private Sub OnRowsAdded(ByVal sender As Object, ByVal e As DataGridViewRowsAddedEventHandler) Handles DataGridView1.RowsAdded
    For i As Integer = 0 To e.RowIndex - 1
        Dim row As DataGridViewRow = DataGridView1.Rows(e.RowIndex + i)
        row.Cells("Contact").Value = String.Format("{0} : {1}", row.Cells("ContactName").Value, row.Cells("Phone").Value)
    Next
End Sub

这导致了一堆新错误，所以我解除了它。为什么会导致错误？

Answer 1

InitializeDataGridView方法中只有一个错误：

AddHandler Me.DataGridView1.RowsAdded, New DataGridViewRowsAddedEventArgs(AddressOf OnRowsAdded)

应该是：

AddHandler Me.DataGridView1.RowsAdded, New DataGridViewRowsAddedEventHandler(AddressOf OnRowsAdded)
                                                                      ^^^^^^

此外，事件处理程序已通过Handles DataGridView1.RowsAdded和Handles DataGridView1.CellFormatting方法末尾的OnRowAdded和OnCellFormatting连接，因此您无需< em>第二次附加事件处理程序。最后不需要这两行（更正的）行：

AddHandler Me.DataGridView1.CellFormatting, New DataGridViewCellFormattingEventHandler(AddressOf OnCellFormatting)
AddHandler Me.DataGridView1.RowsAdded, New DataGridViewRowsAddedEventHandler(AddressOf OnRowsAdded)

DataGridViewRowsAdded处理程序提供错误

1 个答案: