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TreeNodeCollection.Clear Method

.NET Framework 4

Other Versions

Removes all tree nodes from the collection.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)

Syntax

C++

Copy

public virtual void Clear()

Implements

IList.Clear()

Remarks

You can use this method to clear the entire collection of tree nodes from a tree view.

To remove an individual tree node from the collection, use the Remove or RemoveAt methods.

To add new TreeNode objects to the collection, use the Add, AddRange, or Insert methods.

Examples

The following code example copies the TreeNodeCollection from a TreeView to a temporary Array, and then adds the contents of the array to another TreeView using the AddRange method. The TreeNodeCollection from the source TreeView is cleared using the Clear method. This example requires that you have two TreeView controls, one with a collection of TreeNode objects.

C++

Copy


private void MyButtonAddAllClick(object sender, EventArgs e)
{
   // Get the 'myTreeNodeCollection' from the 'myTreeViewBase' TreeView.
   TreeNodeCollection myTreeNodeCollection = myTreeViewBase.Nodes;
   // Create an array of 'TreeNodes'.
   TreeNode[] myTreeNodeArray = new TreeNode[myTreeViewBase.Nodes.Count];
   // Copy the tree nodes to the 'myTreeNodeArray' array.
   myTreeViewBase.Nodes.CopyTo(myTreeNodeArray,0);
   // Remove all the tree nodes from the 'myTreeViewBase' TreeView.
   myTreeViewBase.Nodes.Clear();
   // Add the 'myTreeNodeArray' to the 'myTreeViewCustom' TreeView.
   myTreeViewCustom.Nodes.AddRange(myTreeNodeArray);
}

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference

TreeNodeCollection Class

System.Windows.Forms Namespace

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