以编程方式检查刚刚未选中的DataGridView CheckBox [英] Programmatically check a DataGridView CheckBox that was just unchecked

问题描述

我知道之前也曾问过类似的问题，但是没有一种解决方案对我有帮助。

I am aware that similar questions have been asked before, but none of the solutions are helping me.

我在未绑定的DataGridView中有一个DataGridViewCheckBoxColumn。

在 CellContentClick 事件中，当如果未选中CheckBox，则根据用户在DataGridView后面的业务规则提示用户是否要继续执行此操作，如果他们选择不继续，则要重新检查CheckBox。

I have a DataGridViewCheckBoxColumn in an unbound DataGridView.
In the CellContentClick event, when a CheckBox is unchecked, I am prompting the user whether they want to continue with this operation according to the business rules behind the DataGridView and, if they choose not to continue, I want to re-check the CheckBox.

是对CheckBox的重新检查不起作用。

It is this re-checking of the CheckBox that is not working.

这是我的代码：

private void dgvPeriods_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
    if (e.ColumnIndex == dgvPeriods.Columns["colSelected"].Index)
    {
        dgvPeriods.CommitEdit(DataGridViewDataErrorContexts.Commit);
        DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell)dgvPeriods[e.ColumnIndex, e.RowIndex];

        if (chk.Value = chk.FalseValue)
        {
            If (MessageBox.Show("Continue with this Operation?", "Continue",  MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No)
            {
                chk.Value = chk.TrueValue;
                return;
            }
        }
    }
}

设置了单元格的值，但在视觉上未选中CheckBox。

The value of the cell is being set, but visually the CheckBox is not checked.

如果为 TrueValue 和 FalseValue （布尔值与字符串），我尝试调用 Refresh（），我尝试调用 CommitEdit（），尝试使用 CheckState.Checked 。

If have tried different types for the TrueValue and FalseValue (booleans vs strings), I have tried calling Refresh(), I have tried calling CommitEdit(), I have tried using CheckState.Checked.

如何可视地重新检查CheckBox？

What can I do to visually re-check the CheckBox ?

推荐答案

您可以在之后立即提交修改使用（正确的） CellContentClick 事件system.windows.forms.datagridview.endedit rel = nofollow noreferrer> EndEdit（）方法，因此 CellValueChanged ¹ 事件也会立即引发当前单元格失去焦点后的。

You can commit the edit immediately after a CellContentClick event is raised, using the (proper) EndEdit() method, so the CellValueChanged¹ event is also raised immediately instead of after the current Cell loses focus.

在此处评估新值：由于该值已更改，因此当前值与上一个值相反，这是一个 bool 列。

Evaluate here the new Value: since the Value has changed, it's intended that the current value is the opposite of the previous, give that this is a bool Column.

此时，如果用户确认所做的选择，则重置该值并调用 RefreshEdit（）以便以当前状态重新绘制CheckBox。

At this point, if the User confirms the choice made, you reset the value and call RefreshEdit() to redraw the CheckBox in its current state.

_{注意：您的DataGridView的行为可能取决于操作的上下文。}

_{Note: the behavior of your DataGridView may depend on the context of your operations.}

private void dgvPeriods_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
    if (e.ColumnIndex != dgvPeriods.Columns["colSelected"].Index) return;

    bool newValue = (bool)dgvPeriods[e.ColumnIndex, e.RowIndex].Value;

    if (!newValue) {
        if (MessageBox.Show("Continue with this Operation?", "Continue", 
            MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No) {
            dgvPeriods[e.ColumnIndex, e.RowIndex].Value = true;
            dgvPeriods.RefreshEdit();
        }
    }
}

private void dgvPeriods_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
    // You need to evaluate whether EndEdit() applies to just this Column 
    if (e.ColumnIndex != dgvPeriods.Columns["colSelected"].Index) return;
    dgvPeriods.EndEdit();
}

^{1-请注意，此事件是 really ，在上一个事件处理程序中的代码完成之前立即}

^{1 - Note that this event is raised really immediately, before the code in the previous event handler completes}

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