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


当鼠标悬停时出现TreeNodeOccurs 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将此成员。The following code example demonstrates the use of this member. 在示例中,事件处理程序报告的匹配项NodeMouseHover事件。In the example, an event handler reports on the occurrence of the NodeMouseHover event. 此报表有助于您了解事件发生的并可以帮助您进行调试。This report helps you learn when the event occurs and can assist you in debugging. 若要报告或频繁发生的事件上多个事件,请考虑更换MessageBox.ShowConsole.WriteLine或将消息附加到多行TextBoxTo 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.

若要运行此代码示例,请将其粘贴到包含类型的实例的项目TreeView名为TreeView1To run the example code, paste it into a project that contains an instance of type TreeView named TreeView1. 然后,确保事件处理程序相关联NodeMouseHover事件。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事件发生之前MouseHover事件。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.