当鼠标进入单元格时，如何使单元格值为null？ [英] How to make cell value null when mouse enter in cell?

问题描述

当鼠标进入鼠标选定的单元格时，如何使单元格值为null或为空。



我尝试过：

How to make cell value null or empty when mouse enter in that mouse selected cell.

What I have tried:

private void dataGridView1_CellEnter(object sender, DataGridViewCellEventArgs e)
        {
          
            foreach (DataGridViewRow dr in dataGridView1.SelectedRows)
            {
                dr.Cells["cal_qty"].Value = "";
            }
        }

推荐答案

好吧，正如你问过这个问题一样，这可能会有效你创建了CellMouseEnter事件

Well, as you've asked the question, this 'might' work if you create the CellMouseEnter event

private void dataGridView1_CellMouseEnter(object sender,
    DataGridViewCellEventArgs e)
{
    DataGridViewCell cell = 
            this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex];
    cell.Value = "";

}

但是，我不确定它是否真的需要（想要！=需要） - 如果你在datagridview周围挥动鼠标，这可能会消灭任何/所有细胞



经过一番想法我可能会错误地解释你所问的内容，因此，不是使用CellMouseEnter，而是将上述事件过程中的两行添加到SelectionChanged事件中 - 即

but, Im not sure if its what you actually NEED (want != need) - if you're waving the mouse around your datagridview, this could wipe out any/all cells

after some thought I might be mis-interpreting what you've asked, so, instead of using CellMouseEnter, add the two lines in the event procedure above to the SelectionChanged event - ie

private void dataGridView1_SelectionChanged(object sender,
    DataGridViewCellEventArgs e)
{
    DataGridViewCell cell = 
            this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex];
    cell.Value = "";

}

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