[英]Interaction between ErrorText and ContextMenuStrip
My application has a datagridview with a RowValidating event handler. 我的应用程序具有一个带有RowValidating事件处理程序的datagridview。 If I set
ErrorText
in RowValidating, it correctly disallows left-clicking on other rows and other controls, but if I have a ContextMenuStrip assigned to another control, the ContextMenuStrip remains active. 如果我在RowValidating中设置
ErrorText
,则正确禁止在其他行和其他控件上单击ErrorText
左键,但是如果我将ContextMenuStrip分配给另一个控件,则ContextMenuStrip仍处于活动状态。 The user can right-click on the control with the context menu, select a menu item, and the menu events fire. 用户可以右键单击带有上下文菜单的控件,选择一个菜单项,然后触发菜单事件。
I've tried all sorts of event handling, but the RowValidating event doesn't fire before the menu is presented, so I can't just disable the context menu in RowValidating. 我已经尝试了各种事件处理,但是在显示菜单之前不会触发RowValidating事件,因此我不能只禁用RowValidating中的上下文菜单。 I could perhaps disable the context menu whenever the user is touching any part of the grid, but that has other pitfalls...
每当用户触摸网格的任何部分时,我都可能禁用上下文菜单,但这有其他陷阱。
I've looked and I don't see any existing writeup on a Microsoft defect or a workaround, or even anyone else encountering the error, so I'm not sure what I could be doing wrong. 我已经查看过,但没有看到关于Microsoft缺陷或解决方法的任何现有文章,甚至看不到任何其他遇到此错误的人,因此我不确定自己可能做错了什么。
Simplified example: 简化示例:
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
this.dataGridView1 = new System.Windows.Forms.DataGridView();
this.contextMenuStrip1 = new System.Windows.Forms.ContextMenuStrip(this.components);
this.menuItemToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
this.textBox1 = new System.Windows.Forms.TextBox();
this.Column1 = new System.Windows.Forms.DataGridViewTextBoxColumn();
((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).BeginInit();
this.contextMenuStrip1.SuspendLayout();
this.SuspendLayout();
this.dataGridView1.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] {
this.Column1});
this.dataGridView1.RowValidating += new System.Windows.Forms.DataGridViewCellCancelEventHandler(this.dataGridView1_RowValidating);
this.contextMenuStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
this.menuItemToolStripMenuItem});
this.menuItemToolStripMenuItem.Text = "Menu Item";
this.textBox1.ContextMenuStrip = this.contextMenuStrip1;
this.Controls.Add(this.textBox1);
this.Controls.Add(this.dataGridView1);
((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).EndInit();
this.contextMenuStrip1.ResumeLayout(false);
this.ResumeLayout(false);
this.PerformLayout();
}
private System.Windows.Forms.DataGridView dataGridView1;
private System.Windows.Forms.ContextMenuStrip contextMenuStrip1;
private System.Windows.Forms.ToolStripMenuItem menuItemToolStripMenuItem;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.DataGridViewTextBoxColumn Column1;
private void dataGridView1_RowValidating(object sender, DataGridViewCellCancelEventArgs e)
{
if (!RowValid(dataGridView1.Rows[e.RowIndex]))
{
dataGridView1.Rows[e.RowIndex].ErrorText = "Value must be 5";
e.Cancel = true;
}
else
{
dataGridView1.Rows[e.RowIndex].ErrorText = string.Empty;
e.Cancel = false;
}
}
private bool RowValid(DataGridViewRow row)
{
return string.Equals(row.Cells[0].Value, "5");
}
For reference, these are the events fired in order, note validation does not occur prior to menu opening: 作为参考,这些是按顺序触发的事件,在打开菜单之前不会进行注释验证:
dataGridView1_Enter
dataGridView1_RowEnter
dataGridView1_CellEnter
dataGridView1_CellBeginEdit
contextMenuStrip1_Opening
Handle ToolStripDropDown.Opening event, determine if the context menu should showup or not by setting e.Cancel
. 处理ToolStripDropDown.Opening事件,通过设置
e.Cancel
确定上下文菜单是否应该显示。 Or you can disable the menu item instead. 或者,您也可以禁用菜单项。
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