当用户更改为新值时验证DataGridViewComboBoxCell

本文关键字：新值时 验证 DataGridViewComboBoxCell 用户 | 更新日期: 2023-09-27 18:10:27

我们在DataGridView中有一个列，用户可以从组合框(DataGridViewComboBoxColumn)中选择一个值。我们有一些选择的验证逻辑(覆盖OnCellValidating)。

令人讨厌的是，在对该单元格进行验证之前，用户必须在组合框中进行下拉选择后单击其他地方。我尝试在所选索引发生变化时立即提交编辑(见下文)，但是直到单元格失去焦点时才触发验证。我也试过使用EndEdit()而不是CommitEdit()。

是否有一种方法可以让验证在用户选择组合框中的项目时立即启动?

    protected override void OnEditingControlShowing(DataGridViewEditingControlShowingEventArgs e)
    {
        // Validate selection as soon as user clicks combo box item.
        ComboBox combo = e.Control as ComboBox;
        if (combo != null)
        {
            combo.SelectedIndexChanged -= combo_SelectedIndexChanged;
            combo.SelectedIndexChanged += new EventHandler(combo_SelectedIndexChanged);
        }
        base.OnEditingControlShowing(e);
    }
    void combo_SelectedIndexChanged(object sender, EventArgs e)
    {
        this.NotifyCurrentCellDirty(true);
        this.CommitEdit(DataGridViewDataErrorContexts.Commit);
    }
    protected override void OnCellValidating(DataGridViewCellValidatingEventArgs e)
    {
        // (our validation logic) ...
    }

当用户更改为新值时验证DataGridViewComboBoxCell

您可以模拟tab键来强制单元格失去焦点:

    private void combo_SelectedIndexChanged(object sender, EventArgs e)
    {
        //I expect to get the validation to fire as soon as the user 
        //selects an item in the combo box but the validation 
        //is not firing until the cell loses focus
        //simulate tab key to force the cell to lose focus
        SendKeys.Send("{TAB}");
        SendKeys.Send("+{TAB}");
    }
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