Question

当启用双缓冲时，我在使用C＃.NET DataGridView进行双缓冲时遇到了一些问题。以前我的代码中没有问题，但我添加了以下行：

            typeof(DataGridView).InvokeMember("DoubleBuffered", BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.SetProperty, null, dataGridView1, new object[] { true });

这导致了良好的性能提升，并且已经在很多计算机上运行而没有任何问题。但是我收到了某人的消息，他在30或40分钟后收到以下错误：

 System.NullReferenceException: Object reference not set to an instance of an object.
 at System.Windows.Forms.DataGridViewRowHeaderCell.PaintPrivate(Graphics 
 graphics, Rectangle clipBounds, Rectangle cellBounds, Int32 rowIndex, 
 DataGridViewElementStates dataGridViewElementState, Object formattedValue, 
 String errorText, DataGridViewCellStyle cellStyle, 
 DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts 
 paintParts, Boolean computeContentBounds, Boolean computeErrorIconBounds, 
 Boolean paint)
 at System.Windows.Forms.DataGridViewRowHeaderCell.Paint(Graphics graphics, 
 Rectangle clipBounds, Rectangle cellBounds, Int32 rowIndex, 
 DataGridViewElementStates cellState, Object value, Object formattedValue, 
 String errorText, DataGridViewCellStyle cellStyle, 
 DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts 
 paintParts)
 at System.Windows.Forms.DataGridViewCell.PaintWork(Graphics graphics, 
 Rectangle clipBounds, Rectangle cellBounds, Int32 rowIndex, 
 DataGridViewElementStates cellState, DataGridViewCellStyle cellStyle, 
 DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts 
 paintParts)
 at System.Windows.Forms.DataGridViewRow.PaintHeader(Graphics graphics, 
 Rectangle clipBounds, Rectangle rowBounds, Int32 rowIndex, 
 DataGridViewElementStates rowState, Boolean isFirstDisplayedRow, Boolean 
 isLastVisibleRow, DataGridViewPaintParts paintParts)
 at System.Windows.Forms.DataGridViewRow.Paint(Graphics graphics, Rectangle 
 clipBounds, Rectangle rowBounds, Int32 rowIndex, DataGridViewElementStates 
 rowState, Boolean isFirstDisplayedRow, Boolean isLastVisibleRow)
 at System.Windows.Forms.DataGridView.PaintRows(Graphics g, Rectangle 
 boundingRect, Rectangle clipRect, Boolean singleHorizontalBorderAdded)
 at System.Windows.Forms.DataGridView.PaintGrid(Graphics g, Rectangle 
 gridBounds, Rectangle clipRect, Boolean singleVerticalBorderAdded, Boolean 
 singleHorizontalBorderAdded)
 at System.Windows.Forms.DataGridView.OnPaint(PaintEventArgs e)
 at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, 
 Int16 layer)
 at System.Windows.Forms.Control.WmPaint(Message& m)
 at System.Windows.Forms.Control.WndProc(Message& m)
 at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, 
 IntPtr wparam, IntPtr lparam)**strong text**

我已将以下内容添加到代码中，作为dataGridView的OnPaint事件的事件处理程序

    private void dataGridView1_Paint(object sender, PaintEventArgs e)
    {
        try
        {
            base.OnPaint(e);
        }
        catch (Exception ex)
        {
            this.Invalidate();
        }
    }

我只能尝试看看它是否有效。感谢

使用双缓冲的DataGridView异常

0 个答案: