AfterCheck Event

TreeView.AfterCheck Event


Occurs after the tree node check box is checked.

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

public event TreeViewEventHandler AfterCheck

Setting the TreeNode.Checked property from within a BeforeCheck or AfterCheck event handler causes the event to be raised multiple times and can result in unexpected behavior. To prevent the event from being raised multiple times, add logic to your event handler that only executes your recursive code if the Action property of the TreeViewEventArgs is not set to TreeViewAction.Unknown.

For more information about handling events, see Handling and Raising Events.

Legacy Code Example

The following code example updates all the child tree nodes of a TreeNode when the user changes its checked state. This code requires that you have a Form with a TreeView that has TreeNode objects in its TreeNodeCollection. The TreeNodeCollection should have tree nodes with child nodes.

// Updates all child tree nodes recursively.
private void CheckAllChildNodes(TreeNode treeNode, bool nodeChecked)
   foreach(TreeNode node in treeNode.Nodes)
      node.Checked = nodeChecked;
      if(node.Nodes.Count > 0)
         // If the current node has child nodes, call the CheckAllChildsNodes method recursively.
         this.CheckAllChildNodes(node, nodeChecked);

// NOTE   This code can be added to the BeforeCheck event handler instead of the AfterCheck event.
// After a tree node's Checked property is changed, all its child nodes are updated to the same value.
private void node_AfterCheck(object sender, TreeViewEventArgs e)
   // The code only executes if the user caused the checked state to change.
   if(e.Action != TreeViewAction.Unknown)
      if(e.Node.Nodes.Count > 0)
         /* Calls the CheckAllChildNodes method, passing in the current 
         Checked value of the TreeNode whose checked state changed. */
         this.CheckAllChildNodes(e.Node, e.Node.Checked);

.NET Framework
Available since 1.1
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