TreeView.NodeMouseHover TreeView.NodeMouseHover TreeView.NodeMouseHover TreeView.NodeMouseHover Event


当鼠标悬停在 TreeNode 上时发生。Occurs when the mouse hovers over a TreeNode.

 event System::Windows::Forms::TreeNodeMouseHoverEventHandler ^ NodeMouseHover;
public event System.Windows.Forms.TreeNodeMouseHoverEventHandler NodeMouseHover;
member this.NodeMouseHover : System.Windows.Forms.TreeNodeMouseHoverEventHandler 
Public Custom Event NodeMouseHover As TreeNodeMouseHoverEventHandler 


下面的代码示例演示如何使用此成员。The following code example demonstrates the use of this member. 在此示例中, 事件处理程序报告NodeMouseHover事件的发生。In the example, an event handler reports on the occurrence of the NodeMouseHover event. 此报告可帮助您了解何时发生事件,并可帮助您进行调试。This report helps you learn when the event occurs and can assist you in debugging. 若要报告多个事件或频繁发生的事件, 请考虑MessageBox.ShowConsole.WriteLine消息替换为多行或将TextBox其追加到多行。To report on multiple events or on events that occur frequently, consider replacing MessageBox.Show with Console.WriteLine or appending the message to a multiline TextBox.

若要运行示例代码, 请将其粘贴到包含名为TreeView TreeView1的类型的实例的项目中。To run the example code, paste it into a project that contains an instance of type TreeView named TreeView1. 然后, 确保事件处理程序与NodeMouseHover事件相关联。Then ensure that the event handler is associated with the NodeMouseHover event.

private void TreeView1_NodeMouseHover(Object sender, TreeNodeMouseHoverEventArgs e) {

System.Text.StringBuilder messageBoxCS = new System.Text.StringBuilder();
messageBoxCS.AppendFormat("{0} = {1}", "Node", e.Node );
MessageBox.Show(messageBoxCS.ToString(), "NodeMouseHover Event" );
Private Sub TreeView1_NodeMouseHover(sender as Object, e as TreeNodeMouseHoverEventArgs) _ 
     Handles TreeView1.NodeMouseHover

    Dim messageBoxVB as New System.Text.StringBuilder()
    messageBoxVB.AppendFormat("{0} = {1}", "Node", e.Node)
    MessageBox.Show(messageBoxVB.ToString(),"NodeMouseHover Event")

End Sub


如果鼠标位于TreeNode,则NodeMouseHover MouseHover事件将在事件之前发生。If the mouse is located over a TreeNode, the NodeMouseHover event will occur before the MouseHover event.

有关如何处理事件的详细信息,请参阅处理和引发事件For more information about how to handle events, see Handling and Raising Events.