我正在使用DataGridView从DataTable加载数据。此DataGridView位于选项卡(Forms.TabPage)上。当点击这个标签时,无论数据是否被加载,数据网格都需要一两秒钟的时间从上到下进行绘制。Slow DataGridView绘图渲染
有什么我可以做的,以加快单击Tab时的绘图\渲染?
我不认为DGV的实际人口造成这种情况,因为它是在表单加载期间填充的,所以在标签点击它时会加载显示的几行(20 - 30)。
Using cn As New SqlConnection(connectionString)
Using cmd As SqlCommand = cn.CreateCommand()
cmd.CommandType = System.Data.CommandType.Text
cmd.CommandText = _
" SELECT [finish_time], [file_name], [transfer_status]" & _
" FROM dbo.[transfer_log]"
cmd.Notification = Nothing
cn.Open()
Dim columnSpec = New DataColumn()
With columnSpec
.DataType = GetType(System.String)
.ColumnName = "ClmFinishTime"
End With
Datatable1.Columns.Add(columnSpec)
Dim columnSpec2 = New DataColumn()
With columnSpec2
.DataType = GetType(System.String)
.ColumnName = "ClmFilename"
End With
Datatable1.Columns.Add(columnSpec2)
Dim columnSpec3 = New DataColumn()
With columnSpec3
.DataType = GetType(System.Byte())
.ColumnName = "ClmStatus"
End With
Datatable1.Columns.Add(columnSpec3)
Using dr As SqlDataReader = cmd.ExecuteReader()
While dr.Read()
Dim row As DataRow = Datatable1.NewRow
row("ClmFinishTime") = dr.Item("finish_time")
row("ClmFilename") = dr.Item("file_name")
Select Case dr.Item("transfer_status")
Case 0
row("ClmStatus") = ConvertToByte(My.Resources.accept)
Case 1
row("ClmStatus") = ConvertToByte(My.Resources.remove)
End Select
Datatable1.Rows.Add(row)
End While
End Using
End Using
DataGridView2.AutoGenerateColumns = False
DataGridView2.DataSource = Datatable1
如果我注释掉“DataGridView2.DataSource = Datatable1”,它很好(即时),所以它必须是由于我构建数据源以添加图标来代替返回的列ClmStatus。有什么建议么? – madlan 2010-10-06 20:57:37