依TreeView Remove CheckBox by some Nodes

这样做之后,我有没有父节点复选框的复选框树视图.
但是我遇到了一个问题,我无法更改特定子节点的颜色.

即.如果我尝试改变像

treeview1.Nodes[0].Nodes[2].BackColor=Color.Gray;

仍然具有相同的旧颜色.
谁可以帮我这个事.
谢谢.

已编辑

private const int TVIF_STATE = 0x8;
    private const int TVIS_STATEIMAGEMASK = 0xF000;
    private const int TV_FIRST = 0x1100;
    private const int TVM_SETITEM = TV_FIRST + 63;

    [StructLayout(LayoutKind.Sequential, Pack = 8, CharSet = CharSet.Auto)]
    private struct TVITEM
    {
        public int mask;
        public IntPtr hItem;
        public int state;
        public int stateMask;
        [MarshalAs(UnmanagedType.LPTStr)]
        public string lpszText;
        public int cchTextMax;
        public int iImage;
        public int iSelectedImage;
        public int cChildren;
        public IntPtr lParam;
    }

    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    private static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam,
                                             ref TVITEM lParam);

    /// <summary> 
    /// Hides the checkbox for the specified node on a TreeView control. 
    /// </summary> 
    private void HideCheckBox(TreeView tvw, TreeNode node)
    {
        TVITEM tvi = new TVITEM();
        tvi.hItem = node.Handle;
        tvi.mask = TVIF_STATE;
        tvi.stateMask = TVIS_STATEIMAGEMASK;
        tvi.state = 0;
        SendMessage(tvw.Handle, TVM_SETITEM, IntPtr.Zero, ref tvi);
    }

    /// <summary>
    /// Handles the DrawNode event of the treeView1 control.
    /// </summary>
    /// <param name="sender">The source of the event.</param>
    /// <param name="e">The <see cref="System.Windows.Forms.DrawTreeNodeEventArgs"/> instance containing the event data.</param>
    /// <remarks></remarks>
    private void treeView1_DrawNode(object sender, DrawTreeNodeEventArgs e)
    {
        if (e.Node.Level == 0)
            HideCheckBox(e.Node.TreeView, e.Node);
        e.DrawDefault = true;           
    }




    private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
    {          

        treeView1.Nodes[0].Nodes[1].BackColor = Color.Red;
    }

解决方法:

我已经按照您尝试的方式进行了尝试(特别是DrawNode事件处理程序),而且我很确定您已设置TreeView.DrawMode = TreeViewDrawMode.OwnerDrawText;.那将不会绘制背景(仅文本),所以这就是不更新BackColor的原因.您必须将其设置为TreeViewDrawMode.OwnerDrawAll：

我将使用另一种方法来隐藏所有“子”节点复选框,而不使用DrawNode事件处理程序.我将代码添加到BeforeExpand中,如下所示：

 //BeforeExpand event handler for your TreeView
 private void treeView1_BeforeExpand(object sender, TreeViewCancelEventArgs e){
   foreach (TreeNode node in e.Node.Nodes) 
       HideCheckBox(e.Node.TreeView, e.Node);
 }

您也可以遍历所有级别为> 0的节点,以一次隐藏该复选框.然后,每当您向TreeView中添加更多节点时,如果它不是0级节点,则只需在添加它后立即使用HideCheckBox.

注意：当然,我上面提到的2种方法不需要您将DrawMode设置为Normal以外的任何值.