TreeNodeCollection.Item[] Property
Definition
Important
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Gets or sets a tree node within the collection.
Overloads
Item[Int32] |
Gets or sets the TreeNode at the specified indexed location in the collection. |
Item[String] |
Gets the tree node with the specified key from the collection. |
Item[Int32]
Gets or sets the TreeNode at the specified indexed location in the collection.
public:
virtual property System::Windows::Forms::TreeNode ^ default[int] { System::Windows::Forms::TreeNode ^ get(int index); void set(int index, System::Windows::Forms::TreeNode ^ value); };
public virtual System.Windows.Forms.TreeNode this[int index] { get; set; }
member this.Item(int) : System.Windows.Forms.TreeNode with get, set
Default Public Overridable Property Item(index As Integer) As TreeNode
Parameters
Property Value
The TreeNode at the specified indexed location in the collection.
Exceptions
.NET 6 and later versions: index
is null
.
The index
value is less than 0 or is greater than the last index in the collection.
The TreeNode that's being assigned to this index is already assigned to a different index or to a different TreeView control.
Examples
The following code example removes the first TreeNode from a TreeView if its TreeNode.Text property is set to "Node0". When a Button is clicked, the first TreeNode in the TreeView is deleted using the RemoveAt method. This example requires that you have created a TreeView and a Button on a Form. The first TreeNode in your TreeView should have a text property of "Node0."
void button2_Click( Object^ /*sender*/, EventArgs^ /*e*/ )
{
// Delete the first TreeNode in the collection
// if the Text property is S"Node0."
if ( this->treeView1->Nodes[ 0 ]->Text->Equals( "Node0" ) )
{
this->treeView1->Nodes->RemoveAt( 0 );
}
}
private void button2_Click(object sender, EventArgs e)
{
// Delete the first TreeNode in the collection
// if the Text property is "Node0."
if(this.treeView1.Nodes[0].Text == "Node0")
{
this.treeView1.Nodes.RemoveAt(0);
}
}
Private Sub button2_Click(sender As Object, e As EventArgs) Handles button2.Click
' Delete the first TreeNode in the collection
' if the Text property is "Node0."
If Me.treeView1.Nodes(0).Text = "Node0" Then
Me.treeView1.Nodes.RemoveAt(0)
End If
End Sub
Remarks
To assign TreeNode objects to a specific location, or to retrieve them from the TreeNodeCollection, you can reference the collection object with a specific index value. The index value of the TreeNodeCollection is a zero-based index.
See also
Applies to
Item[String]
Gets the tree node with the specified key from the collection.
public:
virtual property System::Windows::Forms::TreeNode ^ default[System::String ^] { System::Windows::Forms::TreeNode ^ get(System::String ^ key); };
public virtual System.Windows.Forms.TreeNode this[string key] { get; }
public virtual System.Windows.Forms.TreeNode? this[string? key] { get; }
member this.Item(string) : System.Windows.Forms.TreeNode
Default Public Overridable ReadOnly Property Item(key As String) As TreeNode
Parameters
Property Value
The TreeNode with the specified key.
Remarks
The Name property corresponds to the key for a TreeNode in the TreeNodeCollection.
The key comparison is not case-sensitive. If the key
parameter is null
or an empty string, the Item[] property returns null
.
Applies to
Σχόλια
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