TreeNodeCollection.IndexOf(TreeNode) 方法

public:
 int IndexOf(System::Windows::Forms::TreeNode ^ node);

public int IndexOf(System.Windows.Forms.TreeNode node);

member this.IndexOf : System.Windows.Forms.TreeNode -> int

Public Function IndexOf (node As TreeNode) As Integer

參數

傳回

在樹節點集合中找到的項目的零為基礎索引;否則，為負1。

範例

以下程式碼範例判斷指定的 TreeNode 是否屬於 TreeNodeCollection，然後枚舉該集合。 此範例要求你有一個 Form ，TreeView且 有 ，且 包含TreeNodeCollectionTreeNode一個名為 myTreeNode2的 。

void EnumerateTreeNodes()
{
   TreeNodeCollection^ myNodeCollection = myTreeView->Nodes;

   // Check for a node in the collection.
   if ( myNodeCollection->Contains( myTreeNode2 ) )
   {
      myLabel->Text = myLabel->Text + "Node2 is at index: " + myNodeCollection->IndexOf( myTreeNode2 );
   }

   myLabel->Text = myLabel->Text + "\n\nElements of the TreeNodeCollection:\n";

   // Create an enumerator for the collection.
   IEnumerator^ myEnumerator = myNodeCollection->GetEnumerator();
   while ( myEnumerator->MoveNext() )
   {
      myLabel->Text = myLabel->Text + (dynamic_cast<TreeNode^>(myEnumerator->Current))->Text + "\n";
   }
}

private void EnumerateTreeNodes()
{
   TreeNodeCollection myNodeCollection = myTreeView.Nodes;
   // Check for a node in the collection.
   if (myNodeCollection.Contains(myTreeNode2))
   {
      myLabel.Text += "Node2 is at index: " + myNodeCollection.IndexOf(myTreeNode2);
   }
   myLabel.Text += "\n\nElements of the TreeNodeCollection:\n";

   // Create an enumerator for the collection.
   IEnumerator myEnumerator = myNodeCollection.GetEnumerator();
   while(myEnumerator.MoveNext())
   {
      myLabel.Text += ((TreeNode)myEnumerator.Current).Text +"\n";
   }
}

Private Sub EnumerateTreeNodes()
   Dim myNodeCollection As TreeNodeCollection = myTreeView.Nodes
   ' Check for a node in the collection.
   If myNodeCollection.Contains(myTreeNode2) Then
      myLabel.Text += "Node2 is at index: " + myNodeCollection.IndexOf(myTreeNode2)
   End If
   myLabel.Text += ControlChars.Cr + ControlChars.Cr + _
     "Elements of the TreeNodeCollection:" + ControlChars.Cr
   
   ' Create an enumerator for the collection.
   Dim myEnumerator As IEnumerator = myNodeCollection.GetEnumerator()
   While myEnumerator.MoveNext()
      myLabel.Text += CType(myEnumerator.Current, TreeNode).Text + ControlChars.Cr
   End While
End Sub

備註

這個方法所需的時間與節點集合的大小成正比，因此你可能想避免在大型集合中使用它。

此方法僅檢查參考資料的相等性。 你無法用它來取得集合中等價但不同節點的索引。