如何向 Visual C# 中 TreeNote 添加 ToolTip

[code]// Create a root node.
TreeNode rootNode = treeView1.Nodes.Add("Day of Week");

// Create a series of child nodes and then set the Tag property for each.
for (int count = 0; count <= 6; count++)
{
DayOfWeek day = (DayOfWeek)count;
TreeNode childNode = rootNode.Nodes.Add(day.ToString());
childNode.Tag = "This day is " + day.ToString() + ".";
}

// Expand all of the TreeView nodes.
rootNode.ExpandAll();

[code]// Get the node at the current mouse pointer location.
TreeNode theNode =  this.treeView1.GetNodeAt(e.X, e.Y);

// Set a ToolTip only if the mouse pointer is actually paused on a node.
if ((theNode != null))
{
// Verify that the tag property is not "null".
if (theNode.Tag != null)
{
// Change the ToolTip only if the pointer moved to a new node.
if (theNode.Tag.ToString()!=this.toolTip1.GetToolTip(this.treeView1))
{
this.toolTip1.SetToolTip(this.treeView1, theNode.Tag.ToString());
}
}
else
{
this.toolTip1.SetToolTip(this.treeView1, "");
}
}
else     // Pointer is not over a node so clear the ToolTip.
{
this.toolTip1.SetToolTip(this.treeView1, "");
}