TreeNodeCollection.IndexOf(TreeNode) 方法
定義
重要
部分資訊涉及發行前產品,在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊,不做任何明確或隱含的瑕疵擔保。
傳回集合中指定樹狀節點的索引。
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
項目之以零起始的索引,樹狀節點集合中找到,否則為 -1。
範例
下列程式碼範例會判斷指定的 TreeNode 是否在 內 TreeNodeCollection ,然後列舉集合。 此範例會要求您具有 Form , TreeNodeCollectionTreeView 且具有包含 TreeNode 具名 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
這個方法所花費的時間量與節點集合的大小成正比,因此您可能想要避免搭配大型集合使用它。
這個方法只會檢查參考是否相等。 您無法使用它來擷取集合中相等但不同節點的索引。