TreeNodeCollection.Count Property
Definition
Important
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Gets the total number of TreeNode objects in the collection.
public:
property int Count { int get(); };
[System.ComponentModel.Browsable(false)]
public int Count { get; }
[<System.ComponentModel.Browsable(false)>]
member this.Count : int
Public ReadOnly Property Count As Integer
Property Value
The total number of TreeNode objects in the collection.
Implements
- Attributes
Examples
The following code example displays the number of TreeNode objects in a TreeNodeCollection, copies the contents of the collection to an Object array, and displays a list of the tree nodes in a Label control. This example requires that you have a TreeView with at least one TreeNode in its TreeNodeCollection, and a Label control on a Form.
void CopyTreeNodes()
{
// Get the collection of TreeNodes.
TreeNodeCollection^ myNodeCollection = myTreeView->Nodes;
int myCount = myNodeCollection->Count;
myLabel->Text = String::Concat( myLabel->Text, "Number of nodes in the collection : ", myCount );
myLabel->Text = String::Concat( myLabel->Text, "\n\nElements of the Array after Copying from the collection :\n" );
// Create an Object array.
array<Object^>^myArray = gcnew array<Object^>(myCount);
// Copy the collection into an array.
myNodeCollection->CopyTo( myArray, 0 );
for ( int i = 0; i < myArray->Length; i++ )
{
myLabel->Text = myLabel->Text + (dynamic_cast<TreeNode^>(myArray[ i ]))->Text + "\n";
}
}
private void CopyTreeNodes()
{
// Get the collection of TreeNodes.
TreeNodeCollection myNodeCollection = myTreeView.Nodes;
int myCount = myNodeCollection.Count;
myLabel.Text += "Number of nodes in the collection :" + myCount;
myLabel.Text += "\n\nElements of the Array after Copying from the collection :\n";
// Create an Object array.
Object[] myArray = new Object[myCount];
// Copy the collection into an array.
myNodeCollection.CopyTo(myArray,0);
for(int i=0; i<myArray.Length; i++)
{
myLabel.Text += ((TreeNode)myArray[i]).Text + "\n";
}
}
Private Sub CopyTreeNodes()
' Get the collection of TreeNodes.
Dim myNodeCollection As TreeNodeCollection = myTreeView.Nodes
Dim myCount As Integer = myNodeCollection.Count
myLabel.Text += "Number of nodes in the collection :" + myCount.ToString()
myLabel.Text += ControlChars.NewLine + ControlChars.NewLine + _
"Elements of the Array after Copying from the collection :" + ControlChars.NewLine
' Create an Object array.
Dim myArray(myCount -1) As Object
' Copy the collection into an array.
myNodeCollection.CopyTo(myArray, 0)
Dim i As Integer
For i = 0 To myArray.Length - 1
myLabel.Text += CType(myArray(i), TreeNode).Text + ControlChars.NewLine
Next i
End Sub
Remarks
The Count property holds the number of TreeNode objects assigned to the collection. You can use the Count property value as the upper bounds of a loop to iterate through a collection.
Note
Because the index value of a collection is a zero-based index, you must subtract one from the looping variable. If you do not account for this, you will exceed the upper bounds of the collection and throw an IndexOutOfRangeException exception.
Applies to
Σχόλια
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