我有两个ContextMenuStrip的{{1}}设置。第二个ToolStripItem有两个额外的嵌套ToolStripItem。我将其定义为：
ToolStripItem然后我为我想要响应的三个ContextMenuStrip cms = new ContextMenuStrip();
ToolStripMenuItem contextJumpTo = new ToolStripMenuItem();
ToolStripMenuItem contextJumpToHeatmap = new ToolStripMenuItem();
ToolStripMenuItem contextJumpToHeatmapStart = new ToolStripMenuItem();
ToolStripMenuItem contextJumpToHeatmapLast = new ToolStripMenuItem();
cms.Items.AddRange(new ToolStripItem[] { contextJumpTo,
contextJumpToHeatmap});
cms.Size = new System.Drawing.Size(176, 148);
contextJumpTo.Size = new System.Drawing.Size(175, 22);
contextJumpTo.Text = "Jump To (No Heatmapping)";
contextJumpToHeatmap.Size = new System.Drawing.Size(175, 22);
contextJumpToHeatmap.Text = "Jump To (With Heatmapping)";
contextJumpToHeatmap.DropDownItems.AddRange(new ToolStripItem[] { contextJumpToHeatmapStart,
contextJumpToHeatmapLast });
contextJumpToHeatmapStart.Size = new System.Drawing.Size(165, 22);
contextJumpToHeatmapStart.Text = "From Start of File";
contextJumpToHeatmapLast.Size = new System.Drawing.Size(165, 22);
contextJumpToHeatmapLast.Text = "From Last Data Point";
的点击事件设置了一个事件监听器。以下是方法（我只列出了三种方法中的两种）：
ToolStripMenuItem以下是我遇到的问题：
我的void contextJumpTo_Click(object sender, EventArgs e)
{
// Try to cast the sender to a ToolStripItem
ToolStripMenuItem menuItem = sender as ToolStripMenuItem;
if (menuItem != null)
{
// Retrieve the ContextMenuStrip that owns this ToolStripItem
ContextMenuStrip owner = menuItem.Owner as ContextMenuStrip;
if (owner != null)
{
// Get the control that is displaying this context menu
DataGridView dgv = owner.SourceControl as DataGridView;
if (dgv != null)
// DO WORK
}
}
}
void contextJumpToHeatmapStart_Click(object sender, EventArgs e)
{
// Try to cast the sender to a ToolStripItem
ToolStripMenuItem menuItem = sender as ToolStripMenuItem;
if (menuItem != null)
{
// Retrieve the ToolStripItem that owns this ToolStripItem
ToolStripMenuItem ownerItem = menuItem.OwnerItem as ToolStripMenuItem;
if (ownerItem != null)
{
// Retrieve the ContextMenuStrip that owns this ToolStripItem
ContextMenuStrip owner = ownerItem.Owner as ContextMenuStrip;
if (owner != null)
{
// Get the control that is displaying this context menu
DataGridView dgv = owner.SourceControl as DataGridView;
if (dgv != null)
// DO WORK
}
}
}
}
方法效果很好。我们一直到我确定哪个contextJumpTo_Click点击来自哪里，我可以继续。但是，DataGridView contextJumpTo不是ToolStripMenuItem上的嵌套菜单项。
但我的ContextMenuStrip方法无效。当我到达我确定contextJumpToHeatmapStart_Click的行时，owner.SourceControl为空，我无法继续。现在我知道这个SourceControl嵌套在ToolStripMenuItem中的另一个ContextMenuStrip下，但为什么我的SourceControl上的ContextMenuStrip属性突然显示为空？
如何为SourceControl的嵌套ToolStripMenuItem获取ContextMenuStrip？
答案 0 :(得分：12)
我认为这是一个错误。
我试图抓取工具条父项列表以获取ContextStripMenu所有者，但是SourceControl属性始终为null。
看起来常见的解决方法是在上下文菜单的开头设置控件：
private Control menuSource;
cms.Opening += cms_Opening;
void cms_Opening(object sender, CancelEventArgs e) {
menuSource = ((ContextMenuStrip)sender).SourceControl;
}
然后你的代码基本上变成了这个：
DataGridView dgv = menuSource as DataGridView;
if (dgv != null) {
// do work
}