TreeNodeCollection.Clear Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Removes all tree nodes from the collection.
public:
virtual void Clear();
public virtual void Clear ();
abstract member Clear : unit -> unit
override this.Clear : unit -> unit
Public Overridable Sub Clear ()
Implements
Examples
The following code example copies the TreeNodeCollection from a TreeView to a temporary Array, and then adds the contents of the array to another TreeView using the AddRange method. The TreeNodeCollection from the source TreeView is cleared using the Clear method. This example requires that you have two TreeView controls, one with a collection of TreeNode objects.
private:
void MyButtonAddAllClick( Object^ /*sender*/, EventArgs^ /*e*/ )
{
// Get the 'myTreeNodeCollection' from the 'myTreeViewBase' TreeView.
TreeNodeCollection^ myTreeNodeCollection = myTreeViewBase->Nodes;
// Create an array of 'TreeNodes'.
array<TreeNode^>^myTreeNodeArray = gcnew array<TreeNode^>(myTreeViewBase->Nodes->Count);
// Copy the tree nodes to the 'myTreeNodeArray' array.
myTreeViewBase->Nodes->CopyTo( myTreeNodeArray, 0 );
// Remove all the tree nodes from the 'myTreeViewBase' TreeView.
myTreeViewBase->Nodes->Clear();
// Add the 'myTreeNodeArray' to the 'myTreeViewCustom' TreeView.
myTreeViewCustom->Nodes->AddRange( myTreeNodeArray );
}
private void MyButtonAddAllClick(object sender, EventArgs e)
{
// Get the 'myTreeNodeCollection' from the 'myTreeViewBase' TreeView.
TreeNodeCollection myTreeNodeCollection = myTreeViewBase.Nodes;
// Create an array of 'TreeNodes'.
TreeNode[] myTreeNodeArray = new TreeNode[myTreeViewBase.Nodes.Count];
// Copy the tree nodes to the 'myTreeNodeArray' array.
myTreeViewBase.Nodes.CopyTo(myTreeNodeArray,0);
// Remove all the tree nodes from the 'myTreeViewBase' TreeView.
myTreeViewBase.Nodes.Clear();
// Add the 'myTreeNodeArray' to the 'myTreeViewCustom' TreeView.
myTreeViewCustom.Nodes.AddRange(myTreeNodeArray);
}
Private Sub MyButtonAddAllClick(sender As Object, e As EventArgs)
' Get the 'myTreeNodeCollection' from the 'myTreeViewBase' TreeView.
Dim myTreeNodeCollection As TreeNodeCollection = myTreeViewBase.Nodes
' Create an array of 'TreeNodes'.
Dim myTreeNodeArray(myTreeViewBase.Nodes.Count-1) As TreeNode
' Copy the tree nodes to the 'myTreeNodeArray' array.
myTreeViewBase.Nodes.CopyTo(myTreeNodeArray, 0)
' Remove all the tree nodes from the 'myTreeViewBase' TreeView.
myTreeViewBase.Nodes.Clear()
' Add the 'myTreeNodeArray' to the 'myTreeViewCustom' TreeView.
myTreeViewCustom.Nodes.AddRange(myTreeNodeArray)
End Sub
Remarks
You can use this method to clear the entire collection of tree nodes from a tree view.
To remove an individual tree node from the collection, use the Remove or RemoveAt methods.
To add new TreeNode objects to the collection, use the Add, AddRange, or Insert methods.
Applies to
.NET
フィードバック
https://aka.ms/ContentUserFeedback」を参照してください。
以下は間もなく提供いたします。2024 年を通じて、コンテンツのフィードバック メカニズムとして GitHub の issue を段階的に廃止し、新しいフィードバック システムに置き換えます。 詳細については、「フィードバックの送信と表示