Treeview 丢失焦点后依然高亮 SelectedNode

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参考：StackOverFlow、Control.Validating 事件

注意 TreeView 的 HideSelection 要保持为默认值 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;

    }

}