TreeNode Constructors

Definition

Initializes a new instance of the TreeNode class.

Overloads

TreeNode()

Initializes a new instance of the TreeNode class.

TreeNode(String)

Initializes a new instance of the TreeNode class with the specified label text.

TreeNode(SerializationInfo, StreamingContext)

Initializes a new instance of the TreeNode class using the specified serialization information and context.

TreeNode(String, TreeNode[])

Initializes a new instance of the TreeNode class with the specified label text and child tree nodes.

TreeNode(String, Int32, Int32)

Initializes a new instance of the TreeNode class with the specified label text and images to display when the tree node is in a selected and unselected state.

TreeNode(String, Int32, Int32, TreeNode[])

Initializes a new instance of the TreeNode class with the specified label text, child tree nodes, and images to display when the tree node is in a selected and unselected state.

TreeNode()

Source:
TreeNode.cs
Source:
TreeNode.cs
Source:
TreeNode.cs

Initializes a new instance of the TreeNode class.

C#
public TreeNode();

Examples

The following code example creates a root tree node to assign child tree nodes to. A child tree node for each Customer object in an ArrayList is added to the root tree node as well as a child tree node for each Order object assigned to the Customer object. The Customer object is assigned to the Tag property, and the tree nodes representing Customer objects are displayed with Orange text. This example requires that you have a Customer and Order object defined, a TreeView control on a Form, and an ArrayList named customerArray that contains Customer objects.

C#
public class Customer
{
   public ArrayList CustomerOrders;
   public string CustomerName;
   public Customer(string myName)
   {
      CustomerName = myName;
      CustomerOrders = new ArrayList(); 
   }
}
public class Order
{
   public string OrderID;
   public Order(string myOrderID )
   {
      this.OrderID = myOrderID;
   }
}

public void AddRootNodes()
{
   // Add a root node to assign the customer nodes to.
   TreeNode rootNode = new TreeNode();
   rootNode.Text = "CustomerList";
   // Add a main root treenode.
   myTreeView.Nodes.Add(rootNode);

   // Add a root treenode for each 'Customer' object in the ArrayList.
   foreach(Customer myCustomer in customerArray)
   {
      // Add a child treenode for each Order object.
      int i = 0;
      TreeNode[] myTreeNodeArray = new TreeNode[5];
      foreach(Order myOrder in myCustomer.CustomerOrders)
      {
         myTreeNodeArray[i] = new TreeNode(myOrder.OrderID);
         i++;
      }
      TreeNode customerNode = new TreeNode(myCustomer.CustomerName,
        myTreeNodeArray);
        // Display the customer names with and Orange font.
        customerNode.ForeColor = Color.Orange;
        // Store the Customer object in the Tag property of the TreeNode.
        customerNode.Tag = myCustomer;
      myTreeView.Nodes[0].Nodes.Add(customerNode);
   }
}

See also

Applies to

.NET Framework 4.8.1 and other versions
Product Versions
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
Windows Desktop 3.0, 3.1, 5, 6, 7, 8, 9

TreeNode(String)

Source:
TreeNode.cs
Source:
TreeNode.cs
Source:
TreeNode.cs

Initializes a new instance of the TreeNode class with the specified label text.

C#
public TreeNode(string text);
C#
public TreeNode(string? text);

Parameters

text
String

The label Text of the new tree node.

Examples

The following code example displays customer information in a TreeView control. The root tree nodes display customer names, and the child tree nodes display the order numbers assigned to each customer. In this example, 1,000 customers are displayed with 15 orders each. The repainting of the TreeView is suppressed by using the BeginUpdate and EndUpdate methods, and a wait Cursor is displayed while the TreeView creates and paints the TreeNode objects. This example requires that you have a Customer object that can hold a collection of Order objects. It also requires that you have created an instance of a TreeView control on a Form.

C#

// The basic Customer class.
public class Customer : System.Object
{
   private string custName = "";
   protected ArrayList custOrders = new ArrayList();

   public Customer(string customername)
   {
      this.custName = customername;
   }

   public string CustomerName
   {      
      get{return this.custName;}
      set{this.custName = value;}
   }

   public ArrayList CustomerOrders 
   {
      get{return this.custOrders;}
   }
} // End Customer class 

// The basic customer Order class.
public class Order : System.Object
{
   private string ordID = "";

   public Order(string orderid)
   {
      this.ordID = orderid;
   }

   public string OrderID
   {      
      get{return this.ordID;}
      set{this.ordID = value;}
   }
} // End Order class

// Create a new ArrayList to hold the Customer objects.
private ArrayList customerArray = new ArrayList(); 

private void FillMyTreeView()
{
   // Add customers to the ArrayList of Customer objects.
   for(int x=0; x<1000; x++)
   {
      customerArray.Add(new Customer("Customer" + x.ToString()));
   }

   // Add orders to each Customer object in the ArrayList.
   foreach(Customer customer1 in customerArray)
   {
      for(int y=0; y<15; y++)
      {
         customer1.CustomerOrders.Add(new Order("Order" + y.ToString()));    
      }
   }

   // Display a wait cursor while the TreeNodes are being created.
   Cursor.Current = new Cursor("MyWait.cur");
        
   // Suppress repainting the TreeView until all the objects have been created.
   treeView1.BeginUpdate();

   // Clear the TreeView each time the method is called.
   treeView1.Nodes.Clear();

   // Add a root TreeNode for each Customer object in the ArrayList.
   foreach(Customer customer2 in customerArray)
   {
      treeView1.Nodes.Add(new TreeNode(customer2.CustomerName));
          
      // Add a child treenode for each Order object in the current Customer object.
      foreach(Order order1 in customer2.CustomerOrders)
      {
         treeView1.Nodes[customerArray.IndexOf(customer2)].Nodes.Add(
           new TreeNode(customer2.CustomerName + "." + order1.OrderID));
      }
   }

   // Reset the cursor to the default for all controls.
   Cursor.Current = Cursors.Default;

   // Begin repainting the TreeView.
   treeView1.EndUpdate();
}

Remarks

The text parameter value is assigned to the node's Text property and becomes the tree node label.

See also

Applies to

.NET Framework 4.8.1 and other versions
Product Versions
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
Windows Desktop 3.0, 3.1, 5, 6, 7, 8, 9

TreeNode(SerializationInfo, StreamingContext)

Source:
TreeNode.cs
Source:
TreeNode.cs
Source:
TreeNode.cs

Initializes a new instance of the TreeNode class using the specified serialization information and context.

C#
protected TreeNode(System.Runtime.Serialization.SerializationInfo serializationInfo, System.Runtime.Serialization.StreamingContext context);

Parameters

serializationInfo
SerializationInfo

The SerializationInfo that contains the data to deserialize the class.

context
StreamingContext

The StreamingContext that contains the source and destination of the serialized stream.

Applies to

.NET Framework 4.8.1 and other versions
Product Versions
.NET Framework 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
Windows Desktop 3.0, 3.1, 5, 6, 7, 8, 9

TreeNode(String, TreeNode[])

Source:
TreeNode.cs
Source:
TreeNode.cs
Source:
TreeNode.cs

Initializes a new instance of the TreeNode class with the specified label text and child tree nodes.

C#
public TreeNode(string text, System.Windows.Forms.TreeNode[] children);
C#
public TreeNode(string? text, System.Windows.Forms.TreeNode[] children);

Parameters

text
String

The label Text of the new tree node.

children
TreeNode[]

An array of child TreeNode objects.

Examples

The following code example creates a root tree node to assign child tree nodes to. A child tree node for each Customer object in an ArrayList is added to the root tree node as well as a child tree node for each Order object assigned to the Customer object. The Customer object is assigned to the Tag property, and the tree nodes representing Customer objects are displayed with Orange text. This example requires that you have a Customer and Order object defined, a TreeView control on a Form, and an ArrayList named customerArray that contains Customer objects.

C#
public class Customer
{
   public ArrayList CustomerOrders;
   public string CustomerName;
   public Customer(string myName)
   {
      CustomerName = myName;
      CustomerOrders = new ArrayList(); 
   }
}
public class Order
{
   public string OrderID;
   public Order(string myOrderID )
   {
      this.OrderID = myOrderID;
   }
}

public void AddRootNodes()
{
   // Add a root node to assign the customer nodes to.
   TreeNode rootNode = new TreeNode();
   rootNode.Text = "CustomerList";
   // Add a main root treenode.
   myTreeView.Nodes.Add(rootNode);

   // Add a root treenode for each 'Customer' object in the ArrayList.
   foreach(Customer myCustomer in customerArray)
   {
      // Add a child treenode for each Order object.
      int i = 0;
      TreeNode[] myTreeNodeArray = new TreeNode[5];
      foreach(Order myOrder in myCustomer.CustomerOrders)
      {
         myTreeNodeArray[i] = new TreeNode(myOrder.OrderID);
         i++;
      }
      TreeNode customerNode = new TreeNode(myCustomer.CustomerName,
        myTreeNodeArray);
        // Display the customer names with and Orange font.
        customerNode.ForeColor = Color.Orange;
        // Store the Customer object in the Tag property of the TreeNode.
        customerNode.Tag = myCustomer;
      myTreeView.Nodes[0].Nodes.Add(customerNode);
   }
}

Remarks

The text parameter value is assigned to the node's Text property and becomes the tree node label. The tree nodes that are contained in the children array are added to the TreeNodeCollection that is stored in the Nodes property.

See also

Applies to

.NET Framework 4.8.1 and other versions
Product Versions
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
Windows Desktop 3.0, 3.1, 5, 6, 7, 8, 9

TreeNode(String, Int32, Int32)

Source:
TreeNode.cs
Source:
TreeNode.cs
Source:
TreeNode.cs

Initializes a new instance of the TreeNode class with the specified label text and images to display when the tree node is in a selected and unselected state.

C#
public TreeNode(string text, int imageIndex, int selectedImageIndex);
C#
public TreeNode(string? text, int imageIndex, int selectedImageIndex);

Parameters

text
String

The label Text of the new tree node.

imageIndex
Int32

The index value of Image to display when the tree node is unselected.

selectedImageIndex
Int32

The index value of Image to display when the tree node is selected.

Examples

The following code example creates and assigns an ImageList to a TreeView control and fills the TreeView control with TreeNode objects. The tree nodes are assigned images from the ImageList that is displayed when the tree node is in a selected or unselected state. This example requires that you have a Form that contains a TreeView, and an ArrayList that contains Customer objects that each contain Order objects. It also requires that the Customer and Order objects are defined.

C#

public class Customer
{
   public ArrayList CustomerOrders;
   public string CustomerName;
   public Customer(string myName)
   {
      CustomerName = myName;
      CustomerOrders = new ArrayList(); 
   }
}
public class Order
{
   public string OrderID;
   public Order(string myOrderID )
   {
      this.OrderID = myOrderID;
   }
}

private void FillTreeView()
{
    // Load the images in an ImageList.
    ImageList myImageList = new ImageList();
    myImageList.Images.Add(Image.FromFile("Default.gif"));
    myImageList.Images.Add(Image.FromFile("SelectedDefault.gif"));
    myImageList.Images.Add(Image.FromFile("Root.gif"));
    myImageList.Images.Add(Image.FromFile("UnselectedCustomer.gif"));
    myImageList.Images.Add(Image.FromFile("SelectedCustomer.gif"));
    myImageList.Images.Add(Image.FromFile("UnselectedOrder.gif"));
    myImageList.Images.Add(Image.FromFile("SelectedOrder.gif"));
    
    // Assign the ImageList to the TreeView.
    myTreeView.ImageList = myImageList;
    
    // Set the TreeView control's default image and selected image indexes.
    myTreeView.ImageIndex = 0;
    myTreeView.SelectedImageIndex = 1;

    /* Set the index of image from the 
    ImageList for selected and unselected tree nodes.*/
    this.rootImageIndex = 2;
    this.selectedCustomerImageIndex = 3;
    this.unselectedCustomerImageIndex = 4;
    this.selectedOrderImageIndex = 5;
    this.unselectedOrderImageIndex = 6;
    
    // Create the root tree node.
    TreeNode rootNode = new TreeNode("CustomerList");
    rootNode.ImageIndex = rootImageIndex;
    rootNode.SelectedImageIndex = rootImageIndex;
      
    // Add a main root tree node.
    myTreeView.Nodes.Add(rootNode);

    // Add a root tree node for each Customer object in the ArrayList.
    foreach(Customer myCustomer in customerArray)
    {
        // Add a child tree node for each Order object.
        int countIndex=0;
        TreeNode[] myTreeNodeArray = new TreeNode[myCustomer.CustomerOrders.Count];
        foreach(Order myOrder in myCustomer.CustomerOrders)
        {
            // Add the Order tree node to the array.
            myTreeNodeArray[countIndex] = new TreeNode(myOrder.OrderID,
              unselectedOrderImageIndex, selectedOrderImageIndex);
            countIndex++;
        }
        // Add the Customer tree node.
        TreeNode customerNode = new TreeNode(myCustomer.CustomerName,
            unselectedCustomerImageIndex, selectedCustomerImageIndex, myTreeNodeArray);
        myTreeView.Nodes[0].Nodes.Add(customerNode);
    }
}

Remarks

The text parameter value is assigned to the node's Text property and becomes the tree node label. The imageIndex and selectedImageIndex values are the index values of an Image stored in the ImageList assigned to the TreeView.ImageList property. The image referenced in the imageIndex property is displayed when the tree node is not selected. Likewise, the image referenced in the selectedImageIndex property is displayed when the tree node is in a selected state.

See also

Applies to

.NET Framework 4.8.1 and other versions
Product Versions
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
Windows Desktop 3.0, 3.1, 5, 6, 7, 8, 9

TreeNode(String, Int32, Int32, TreeNode[])

Source:
TreeNode.cs
Source:
TreeNode.cs
Source:
TreeNode.cs

Initializes a new instance of the TreeNode class with the specified label text, child tree nodes, and images to display when the tree node is in a selected and unselected state.

C#
public TreeNode(string text, int imageIndex, int selectedImageIndex, System.Windows.Forms.TreeNode[] children);
C#
public TreeNode(string? text, int imageIndex, int selectedImageIndex, System.Windows.Forms.TreeNode[] children);

Parameters

text
String

The label Text of the new tree node.

imageIndex
Int32

The index value of Image to display when the tree node is unselected.

selectedImageIndex
Int32

The index value of Image to display when the tree node is selected.

children
TreeNode[]

An array of child TreeNode objects.

Examples

The following code example creates and assigns an ImageList to a TreeView control and fills the TreeView control with TreeNode objects. The tree nodes are assigned images from the ImageList that is displayed when the tree node is in a selected or unselected state. This example requires that you have a Form that contains a TreeView, and an ArrayList that contains Customer objects that each contain Order objects. It also requires that the Customer and Order objects are defined.

C#

public class Customer
{
   public ArrayList CustomerOrders;
   public string CustomerName;
   public Customer(string myName)
   {
      CustomerName = myName;
      CustomerOrders = new ArrayList(); 
   }
}
public class Order
{
   public string OrderID;
   public Order(string myOrderID )
   {
      this.OrderID = myOrderID;
   }
}

private void FillTreeView()
{
    // Load the images in an ImageList.
    ImageList myImageList = new ImageList();
    myImageList.Images.Add(Image.FromFile("Default.gif"));
    myImageList.Images.Add(Image.FromFile("SelectedDefault.gif"));
    myImageList.Images.Add(Image.FromFile("Root.gif"));
    myImageList.Images.Add(Image.FromFile("UnselectedCustomer.gif"));
    myImageList.Images.Add(Image.FromFile("SelectedCustomer.gif"));
    myImageList.Images.Add(Image.FromFile("UnselectedOrder.gif"));
    myImageList.Images.Add(Image.FromFile("SelectedOrder.gif"));
    
    // Assign the ImageList to the TreeView.
    myTreeView.ImageList = myImageList;
    
    // Set the TreeView control's default image and selected image indexes.
    myTreeView.ImageIndex = 0;
    myTreeView.SelectedImageIndex = 1;

    /* Set the index of image from the 
    ImageList for selected and unselected tree nodes.*/
    this.rootImageIndex = 2;
    this.selectedCustomerImageIndex = 3;
    this.unselectedCustomerImageIndex = 4;
    this.selectedOrderImageIndex = 5;
    this.unselectedOrderImageIndex = 6;
    
    // Create the root tree node.
    TreeNode rootNode = new TreeNode("CustomerList");
    rootNode.ImageIndex = rootImageIndex;
    rootNode.SelectedImageIndex = rootImageIndex;
      
    // Add a main root tree node.
    myTreeView.Nodes.Add(rootNode);

    // Add a root tree node for each Customer object in the ArrayList.
    foreach(Customer myCustomer in customerArray)
    {
        // Add a child tree node for each Order object.
        int countIndex=0;
        TreeNode[] myTreeNodeArray = new TreeNode[myCustomer.CustomerOrders.Count];
        foreach(Order myOrder in myCustomer.CustomerOrders)
        {
            // Add the Order tree node to the array.
            myTreeNodeArray[countIndex] = new TreeNode(myOrder.OrderID,
              unselectedOrderImageIndex, selectedOrderImageIndex);
            countIndex++;
        }
        // Add the Customer tree node.
        TreeNode customerNode = new TreeNode(myCustomer.CustomerName,
            unselectedCustomerImageIndex, selectedCustomerImageIndex, myTreeNodeArray);
        myTreeView.Nodes[0].Nodes.Add(customerNode);
    }
}

Remarks

The text parameter value is assigned to the node's Text property and becomes the tree node label. The imageIndex and selectedImageIndex values are the index values of an Image stored in the ImageList assigned to the TreeView.ImageList property. The image referenced in the imageIndex parameter is displayed when the tree node is not selected. Likewise, the image referenced in the selectedImageIndex parameter is displayed when the tree node is in a selected state. The tree nodes that are contained in the children array are added to the TreeNodeCollection that is stored in the Nodes property.

See also

Applies to

.NET Framework 4.8.1 and other versions
Product Versions
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
Windows Desktop 3.0, 3.1, 5, 6, 7, 8, 9