asp.net winform TreeView节点中的CheckBox 禁用实例

        private void myTreeView1_BeforeCheck(object sender, TreeViewCancelEventArgs e)
        {
            if(e.Node.ForeColor==Color.Gray)
                e.Cancel
        }

public partial class MyTreeView : TreeView
    {
        private Brush b = null;//节点字体颜色
        private Point p;//画CheckBox的位置
        public MyTreeView()
        {
            this.DrawMode = TreeViewDrawMode.OwnerDrawText;//自己画文本
        }
        protected override void OnDrawNode(DrawTreeNodeEventArgs e)
        {
            b = Brushes.Black;//默认字体为黑色
            if (e.Node.ForeColor == Color.Gray)
            {
                p = e.Bounds.Location;//获取节点的位置
               　　p.X = p.X - 12;//覆盖到默认画CheckBox的位置
                　 CheckBoxRenderer.DrawCheckBox(e.Graphics, p, CheckBoxState.CheckedDisabled);//画一个禁用的选中的CheckBox
                b = Brushes.Gray;//当前节点字体为灰色
            }
            if ((e.State & TreeNodeStates.Focused) != 0)
                b = Brushes.White;//点击某节点时节点字体颜色为白色
            e.Graphics.DrawString(e.Node.Text, this.Font, b, e.Bounds.Location);//画文本
        }
    }