C#工具提示问题

我有下面的代码，它对位于表中的PictureBox执行图像滚动。每个表格单元格中都有一个picturebox

问题是，即使在代码中声明不应在picturebox上显示工具提示，也会以某种方式显示一些工具提示。我在代码中找不到它，因为代码没有指定工具提示

我尝试过几种方法，但当使用工具提示时，它们似乎都会崩溃。。工具提示控件中是否存在已知错误

    private bool deployingShip = false;

    private void PictureBox_MouseEnter(object sender, EventArgs e)
    {
        PictureBox HomeCurrentPicBox = ((PictureBox)(sender));
        TableLayoutPanelCellPosition HomeCurrentPosition = HomeTableLayoutPanel.GetCellPosition(HomeCurrentPicBox);

        RefreshHomeGrid();

        if (deployingShip == false)
        {
            if (GameModel.HomeCellStatus(HomeCurrentPosition.Column, HomeCurrentPosition.Row) == Cell.cellState.Water)
            {
                HomeTableLayoutPanel.Cursor = Cursors.Hand;
                HomeCurrentPicBox.Image = Properties.Resources.Scan;
                HomeCurrentPicBox.Refresh();
            }
            else
            {
                HomeTableLayoutPanel.Cursor = Cursors.No;
                HomeTableLayoutPanel.Refresh();
            }
            gameFormToolTip.SetToolTip(HomeCurrentPicBox, GameModel.alphaCoords(HomeCurrentPosition.Column) + "," + HomeCurrentPosition.Row);
         }

        if (deployingShip == true)
        {
            Cell.cellState state = GameModel.HomeCellStatus(HomeCurrentPosition.Column, HomeCurrentPosition.Row);
            switch (state)
            {
                case Cell.cellState.Origin:
                    HomeTableLayoutPanel.Cursor = Cursors.Hand;
                    gameFormToolTip.SetToolTip(HomeCurrentPicBox, currentShip.ToString() + ": " + Cell.cellState.Origin);
                    break;

                case Cell.cellState.EndPoint:
                    HomeTableLayoutPanel.Cursor = Cursors.Hand;
                    gameFormToolTip.SetToolTip(HomeCurrentPicBox, currentShip.ToString() + ": " + Cell.cellState.EndPoint);
                    break;
                default:
                    HomeTableLayoutPanel.Cursor = Cursors.No;
                    HomeTableLayoutPanel.Refresh();
                    return;
            }
        }
    }

    private void PictureBox_MouseLeave(object sender, EventArgs e)
    {
        PictureBox HomeCurrentPicBox = ((PictureBox)(sender));
        TableLayoutPanelCellPosition HomeCurrentPosition = HomeTableLayoutPanel.GetCellPosition(HomeCurrentPicBox);

        if (GameModel.HomeCellStatus(HomeCurrentPosition.Column, HomeCurrentPosition.Row) == Cell.cellState.Water)
        {
            HomeCurrentPicBox.Image = Properties.Resources.Water;
            HomeCurrentPicBox.Refresh();
        }
    }

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谢谢，我担心您无法从提交的代码中找到错误：（

您是否错过了从工具提示中显式删除旧值的调用？根据代码，我猜它可能属于MouseLeave事件处理程序

gameFormToolTip.SetToolTip(HomeCurrentPicBox, ""); 

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现在已经测试过了！谢谢你让SetToolTip行为变得清晰！就是这样。谢谢很多次。工具提示没有清晰的命令一直困扰着我。而且，不应该是

String.Empty

？是的，我使用了String.Empty，但John L.提供了一个可靠的解决方案。