显示时如何刷新DataGridView单元格的工具提示? [英] How to refresh tooltip of a DataGridView cell while it's shown?

问题描述

我试图刷新 DataGridViewCell 的工具提示，而无需离开并使用光标重新输入单元格.

I am trying to refresh the tooltip of a DataGridViewCell without leaving and reentering the cell with the cursor.

我为单元格的 ToolTipText 属性分配了一个新值，但是在显示工具提示时，更改列的 ToolTipText 属性对工具提示没有任何影响正在显示.

I assign a new value to ToolTipText property of the cell, but while the tooltip is showing, changing ToolTipText property of column doesn't have any impact on the tooltip which is showing.

这是我的服务器应用程序的快照.人们可以加入，并且您可以看到他们的ping:

This is a snapshot of a server application of mine. People can join and you can see their ping:

我希望能够看到ping的变化.

I want to be able to see how the ping changes.

推荐答案

当显示单元格的 ToolTip 时，更改单元格的 ToolTipText 不变工具提示文字会自动显示.要对其进行更改，可以处理 DataGridView 的 CellToolTipChanged 事件，以检测单元格的 ToolTipText 中的更改.然后，您可以使用以下代码检查使 DataGridView 在工具提示中显示新文本:

When the ToolTip of a cell is showing, changing the ToolTipText of the cell doesn't change the tool tip text automatically. To change it, you can handle CellToolTipChanged event of DataGridView to detect a change in ToolTipText of a cell. Then you can check make the DataGridView shows the new text in tooltip using such code:

private void dgv_CellToolTipTextChanged(object sender, DataGridViewCellEventArgs e)
{
    var grid = (DataGridView)sender;
    var toolTipControl = grid.GetType().GetField("toolTipControl",
            System.Reflection.BindingFlags.NonPublic |
            System.Reflection.BindingFlags.Instance).GetValue(grid);
    var activated = (bool)toolTipControl.GetType()
        .GetProperty("Activated").GetValue(toolTipControl);
    if (activated)
    {
        var cell = grid[e.ColumnIndex, e.RowIndex];
        var ActivateToolTip = typeof(DataGridView).GetMethod("ActivateToolTip",
                System.Reflection.BindingFlags.NonPublic |
                System.Reflection.BindingFlags.Instance);
        ActivateToolTip.Invoke(grid,
            new object[] { true, cell.ToolTipText, e.ColumnIndex, e.RowIndex });
    }
}

示例

作为示例，我在计时器中更改了单元格的 ToolTipText 以获得以下结果:

As an example, I changed the ToolTipText of a cell in a timer to get the following result:

private void timer1_Tick(object sender, EventArgs e)
{
    this.dataGridView1.Rows[0].Cells[0].ToolTipText = DateTime.Now.ToString();
}

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