TreeNodeCollection.Clear 方法

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

從集合中移除所有樹狀節點。

public:
 virtual void Clear();

public virtual void Clear ();

abstract member Clear : unit -> unit
override this.Clear : unit -> unit

Public Overridable Sub Clear ()

實作

Clear()

範例

下列程式碼範例會 TreeNodeCollection 從 TreeView 複製到暫存 Array 的 ，然後使用 方法將 陣列的內容加入另一個 TreeView AddRange 陣列中。 來源的 TreeView 會 TreeNodeCollection 使用 Clear 方法清除 。 此範例需要您有兩 TreeView 個控制項，一個包含 物件的集合 TreeNode 。

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

備註

您可以使用這個方法，從樹狀檢視清除整個樹狀節點集合。

若要從集合中移除個別樹狀節點，請使用 Remove 或 RemoveAt 方法。

若要將新 TreeNode 物件加入至集合，請使用 Add 、 AddRange 或 Insert 方法。