Treeview 丟失焦點後依然高亮 SelectedNode

參考：StackOverFlow、Control.Validating 事件

注意 TreeView 的 HideSelection 要保持爲默認值True。

private TreeNode previousSelectedNode; private void treeView1_Validating(object sender, System.ComponentModel.CancelEventArgs e) { treeView1.SelectedNode.BackColor = SystemColors.Highlight; treeView1.SelectedNode.ForeColor = Color.White; previousSelectedNode = treeView1.SelectedNode; } private void treeView1_AfterSelect(object sender, TreeViewEventArgs e) { if(previousSelectedNode != null) { previousSelectedNode.BackColor = treeView1.BackColor; previousSelectedNode.ForeColor = treeView1.ForeColor; } }

 

private TreeNode previousSelectedNode;

private void treeView1_Validating(object sender, System.ComponentModel.CancelEventArgs e)
{
    treeView1.SelectedNode.BackColor = SystemColors.Highlight;
    treeView1.SelectedNode.ForeColor = Color.White;
    previousSelectedNode = treeView1.SelectedNode;
}

private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
{
    if(previousSelectedNode != null)
    {
        previousSelectedNode.BackColor = treeView1.BackColor;
        previousSelectedNode.ForeColor = treeView1.ForeColor;
    }
}