在我的c#windows应用程序中,我有一个树形视图列表框,其复选框设置为true。在运行时,我的程序在xml文件中检查此树视图的节点。在我的应用程序中,我使用下面显示的代码隐藏了父节点复选框:
public const int TVIF_STATE = 0x8;
public const int TVIS_STATEIMAGEMASK = 0xF000;
public const int TV_FIRST = 0x1100;
public const int TVM_SETITEM = TV_FIRST + 63;
[DllImport("user32.dll")]
static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam,
IntPtr lParam);
public 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;
}
void tree_DrawNode(object sender, DrawTreeNodeEventArgs e)
{
if (e.Node.Level == 1)
HideCheckBox(e.Node.Parent);
e.DrawDefault = true;
}
private void HideCheckBox(TreeNode node)
{
TVITEM tvi = new TVITEM();
tvi.hItem = node.Handle;
tvi.mask = TVIF_STATE;
tvi.stateMask = TVIS_STATEIMAGEMASK;
tvi.state = 0;
IntPtr lparam = Marshal.AllocHGlobal(Marshal.SizeOf(tvi));
Marshal.StructureToPtr(tvi, lparam, false);
SendMessage(this.taskslctor_treeview.Handle, TVM_SETITEM, IntPtr.Zero, lparam);
}
我现在想要的是我应该能够检查所选的任何子节点(在运行时),如果有任何选择我应该能够将所选子节点的文本添加到数组列表中(因为多个复选框可以是如果没有选中,则消息框显示为未选中。
在隐藏父复选框之前,当我尝试下面的代码时,它工作正常。但是现在(在隐藏父复选框之后)这不起作用..
public void checkednodes()
{
foreach (TreeNode node in taskslctor_treeview.Nodes)
{
if (node.Checked)
{
check.Add(node.Text);
MessageBox.Show(check.ToString());
}
}
if (check.Count == 0)
{
MessageBox.Show("Atleast one task needs to be selected!!", "Error");
}
}
任何直接的帮助都会非常感激...因为我的工作现在暂停了......
答案 0 :(得分:1)
根据您的评论,您似乎只需要查看child nodes
,而不是level-1 node
,因此这应该对您有用:
//Use this to get all the Checked child nodes under a Parent node
private List<TreeNode> GetCheckedNodes(TreeNode node){
List<TreeNode> nodes = new List<TreeNode>();
if(node.Checked) nodes.Add(node);
foreach(TreeNode n in node.Nodes)
nodes.AddRange(GetCheckedNodes(n));
return nodes;
}
check.Clear();
foreach (TreeNode node in taskslctor_treeview.Nodes) {
foreach(TreeNode childNode in GetCheckedNodes(node)){
check.Add(childNode.Text);
}
}
MessageBox.Show(check.ToString());
if (check.Count == 0){
MessageBox.Show("Atleast one task needs to be selected!!", "Error");
}
要同时获取Checked
和Unchecked
个节点,您应该声明分别存储节点的2 List<TreeNode>
,然后您只需要一个recursive
循环来填充2个列表,像这样:
List<TreeNode> checkedNodes = new List<TreeNode>();
List<TreeNode> uncheckedNodes = new List<TreeNode>();
private void FillNodeLists(TreeNode node){
if(node.Checked) checkedNodes.Add(node);
else uncheckedNodes.Add(node);
foreach(TreeNode n in node.Nodes)
FillNodeLists(n);
}
//then just use the 2 Lists (such as loop through them)