[英]Access and disable ToolStripItems (ToolStripButtons, ToolStripMenuItems) using their names
[英]How to extract all ToolStripMenuItems of a ContextMenuStrip using recursion?
我正在尝试将 ContextMenuStrip 中的所有项目提取到List(Of ToolStripMenuItem)
。
我可以获得 DataGridView 的 ContextMenuStrip 的引用,然后 - 使用递归函数 - 我想提取所有ToolStripMenuItems
的Name
和Text
属性,不包括ToolStripSeparators
,如果有的话。
我使用这个代码:
allItem = New List(Of Control)
Dim lstDbg As List(Of Control) = FindControlRecursive(allItem, form, GetType(DataGridView))
Dim dictRes As New Dictionary(Of String, String)
For Each dbgCtrl As Control In lstDbg
If dbgCtrl.Name <> "" Then
For Each mnuStrip As ToolStripItem In dbgCtrl.ContextMenuStrip.Items
If mnuStrip.GetType() = GetType(ToolStripMenuItem) Then
Dim lstItem As New List(Of ToolStripMenuItem)
Dim lstTS As List(Of ToolStripMenuItem) = FindControlRecursive_ContextMenu(lstItem, mnuStrip, GetType(ToolStripMenuItem))
For Each item As ToolStripMenuItem In lstTS
dictRes.Add(item.Name, item.Text)
Next
End If
Next
End If
Next
递归函数是FindControlRecursive_ContextMenu()
:
Public Function FindControlRecursive_ContextMenu(ByVal list As List(Of ToolStripMenuItem), ByVal parent As ToolStripMenuItem, ByVal ctrlType As System.Type) As List(Of ToolStripMenuItem)
If parent Is Nothing Then Return list
If parent.GetType Is ctrlType Then
list.Add(parent)
End If
For Each child As ToolStripMenuItem In parent.DropDown.Items
FindControlRecursive_ContextMenu(list, child, ctrlType)
Next
Return list
End Function
它有效,但如果在 DropDown 列表中有一个ToolStripSeparator
,我没有DropDown.Items
元素并且该函数会生成异常。
如何跳过 ToolStripSeparators 并使用下一个“子项”调用递归函数?
由于只需要ToolStripMenuItem类型的子项,您可以简单地预先过滤 ContextMenuStrip.Items 集合,只收集该特定类型的 Item。 Collection.OfType([Type])方法通常用于此目的。 OfType()
仅返回指定类型的项: ToolStripSeparator不属于该类型,因此它不会包含在过滤的集合中(其他组件类型,例如 ToolStripTextBox、ToolStripComboBox 等)也不会包含在内。
递归函数可以是一个迭代器,它返回一个IEnumerable(Of ToolStripMenuItem)
,它产生在for each
循环中找到的每个项目。
调用 main 方法,例如:
► 将Option Strict
、 Option Explicit
和Option Infer
为On
Dim cmsItems As Dictionary(Of String, String) = GetAllContextMenuItems(contextMenuStrip1)
Imports System.Linq
Private Function GetAllContextMenuItems(contextMenu As ContextMenuStrip) As Dictionary(Of String, String)
If contextMenu Is Nothing OrElse (Not contextMenu.HasChildren) Then Return Nothing
Dim dict = New Dictionary(Of String, String)
For Each item As ToolStripMenuItem In contextMenu.Items.OfType(Of ToolStripMenuItem)
dict.Add(item.Name, item.Text)
For Each subItem In GetSubMenuItems(item)
dict.Add(subItem.Name, subItem.Text)
Next
Next
Return dict
End Function
Private Iterator Function GetSubMenuItems(parent As ToolStripMenuItem) As IEnumerable(Of ToolStripMenuItem)
For Each item As ToolStripMenuItem In parent.DropDownItems.OfType(Of ToolStripMenuItem)
If item.HasDropDownItems Then
For Each subItem As ToolStripMenuItem In GetSubMenuItems(item)
Yield subItem
Next
Else
Yield item
End If
Next
End Function
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