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C# 集合；} 公共列表子项{get；set；} 公共重写字符串ToString（） { 返回文本； } }

c# .net winforms menu

C# 集合；} 公共列表子项{get；set；} 公共重写字符串ToString（） { 返回文本； } },c#,.net,winforms,menu,tree-structure,C#,.net,Winforms,Menu,Tree Structure,注意：没关系。我知道，这里真是一团糟，只是为了学习而想弄明白而已——谢谢 您每次都在初始化sampleDynamicNav=new List（）集合。而您应该初始化一次，然后将新项目添加到此集合。请检查。事实上，我已经创建了一个更通用的方法版本。如果您有兴趣使用，请告诉我。它允许您将所有类型的数据源转换为所有类型的树结构：D.我将研究@Reza Aghaei，非常感谢。虽然我不确定我是否可以使用相同的导航栏，我正在使用。我正在尝试创建您共享的确切树结构。不客气。尝试一下精确的代码，看看结果。我看

注意：没关系。我知道，这里真是一团糟，只是为了学习而想弄明白而已——谢谢

您每次都在初始化sampleDynamicNav=new List（）集合。而您应该初始化一次，然后将新项目添加到此集合。请检查。事实上，我已经创建了一个更通用的方法版本。如果您有兴趣使用，请告诉我。它允许您将所有类型的数据源转换为所有类型的树结构：D.我将研究@Reza Aghaei，非常感谢。虽然我不确定我是否可以使用相同的导航栏，我正在使用。我正在尝试创建您共享的确切树结构。不客气。尝试一下精确的代码，看看结果。我看不到任何东西阻止你将上述代码应用到你的导航菜单上。好的@Reza Aghaei。我现在一定会试试，并会让你知道这一点。再次感谢您的时间和努力。我已经在@Reza Aghaei使其工作，并且通过您的代码示例，我稍微修改了现有的一个，使其能够根据需要工作。将在此处共享代码示例，以便将来其他人可以使用它。没有完成的，简单的一个-再次非常感谢，如果需要改进代码示例的任何想法，都会让您大吃一惊。如果您打算使用相同的解决方案将
TreeNode
添加到
TreeView
，然后，最好将
GetNavBarItems
和
convertenitytonavBarItem
更改为使用
TreeNode
NavBarItem
只是一个示例，您可以使用任何其他类型，如
TreeNode
。要更改它，只需将
NavBarItem
替换为
TreeNode
，将
Childs
替换为
节点。然后它将用于树状视图，在您得到
列表
结果后，您可以轻松地将它们添加到
节点
集合的
树状视图
。每个节点都有自己的节点。我在这里发布了
TreeView
的答案：

public List<NavBarItem> sampleDynamicNav; //List of navbar objects
public DemoItems()
{
    //Create object instance here and assign the parent as well child menus here
    sampleDynamicNav = new List<NavBarItem> {
    new NavBarItem {ID = 1, Text = "UserInfo", Icon = new ItemIcon {Default = SampleProject.Properties.Resources.nav_new_home, Hover = SampleProject.Properties.Resources.nav_new_home, Selected = SampleProject.Properties.Resources.nav_new_home}, ToolTip = "tooltip Main Menu", Height = 40,
        Icon = new ItemIcon {Default = SampleProject.Properties.Resources.nav_new_home, Hover = SampleProject.Properties.Resources.nav_new_home, Selected = SampleProject.Properties.Resources.nav_new_home }, ToolTip = "tooltip Desktop"},
        Childs = new List<NavBarItem> {
                    new NavBarItem {ID = 41, Text = "Add/Edit Users", Height = 30 },
                    new NavBarItem {ID = 42, ParentID = 1, Text = "Inactive User", Height = 30}
    };
}



public DemoItems()
{
    foreach (var parent in GetParent("USER-0001"))
    {
          foreach (var child in GetChild(parent.MenuNo))
          {
            sampleDynamicNav = new List<NavBarItem> {
                 new NavBarItem {
                 ID = parent.MenuNo, Text = parent.MenuName, Icon = new ItemIcon {Default =  SampleProject.Properties.Resources.nav_new_home, Hover = SampleProject.Properties.Resources.nav_new_home, Selected = SampleProject.Properties.Resources.nav_new_home}, ToolTip = "tooltip Main Menu", Height = 40,
                 Childs = new List<NavBarItem> {
                                    new NavBarItem {ID = child.MenuNo, ParentID = parent.MenuNo, Text = child.MenuName, Height = 30 },
                           }
                     }
               };
          }
     }
}



foreach (var child in GetChild(parent.MenuNo))
{
   Childs = new List<NavBarItem> {
            new NavBarItem {ID = child.MenuNo, ParentID = parent.MenuNo, Text = child.MenuName, Height = 30 },
}



/**Get Menu Details - Starts**/
public IEnumerable<UserViewModel> GetParent(string empNo)
{
       List<UserViewModel> lstUser = new List<UserViewModel>();

       string query = "SELECT DISTINCT M.PARENT, M.MENUNO, M.MENUNAME FROM (SELECT DISTINCT M.MENUNO, M.MENUNAME, M.PARENT " +
                      "FROM USER_DETAILS U INNER JOIN USER_GROUP_DETAILS UG ON UG.EMPNO = U.EMPNO " +
                      "INNER JOIN ASSIGN_MENU_DETAILS AM ON AM.GROUPNO = UG.GROUPNO INNER JOIN MENU_DETAILS M " +
                      "ON M.MENUNO = AM.MENUNO WHERE U.EMPNO = '" + empNo + "' " +
                      "UNION ALL " +
                      "SELECT DISTINCT M.MENUNO, M.MENUNAME, " +
                      "M.PARENT FROM MENU_DETAILS M " +
                      "INNER JOIN MENU_DETAILS C " +
                      "ON C.PARENT = M.MENUNO) m WHERE M.PARENT = '0' ORDER BY M.PARENT";

        DataTable dt = SelectData(query);

        if (dt != null && dt.Rows.Count > 0)
        {
            foreach (DataRow dr in dt.Rows)
            {
                UserViewModel bo = new UserViewModel();
                bo.Parent = Convert.ToInt32(dr["PARENT"].ToString());
                bo.MenuNo = Convert.ToInt32(dr["MENUNO"].ToString());
                bo.MenuName = dr["MENUNAME"].ToString();

                lstUser.Add(bo);
            }
        }
   return lstUser;
}
/**Get Menu Details - Ends**/



private IEnumerable<NavBarItem> GetNavBarItems<T>(
    IEnumerable<T> source,
    Func<T, Boolean> isRoot,
    Func<T, IEnumerable<T>, IEnumerable<T>> getChilds,
    Func<T, NavBarItem> getItem)
{
    IEnumerable<T> roots = source.Where(x => isRoot(x));
    foreach (T root in roots)
        yield return ConvertEntityToNavBarItem(root, source, getChilds, getItem); ;
}

private NavBarItem ConvertEntityToNavBarItem<T>(
    T entity,
    IEnumerable<T> source,
    Func<T, IEnumerable<T>, IEnumerable<T>> getChilds,
    Func<T, NavBarItem> getItem)
{
    NavBarItem node = getItem(entity);
    var childs = getChilds(entity, source);
    foreach (T child in childs)
        node.Childs.Add(ConvertEntityToNavBarItem(child, source, getChilds, getItem));
    return node;
}



var dt = new DataTable();
dt.Columns.Add("Id", typeof(int));
dt.Columns.Add("Name", typeof(string));
dt.Columns.Add("ParentId", typeof(int));

dt.Rows.Add(1, "Menu 1", DBNull.Value);
dt.Rows.Add(11, "Menu 1-1", 1);
dt.Rows.Add(111, "Menu 1-1-1", 11);
dt.Rows.Add(112, "Menu 1-1-2", 11);
dt.Rows.Add(12, "Menu 1-2", 1);
dt.Rows.Add(121, "Menu 1-2-1", 12);
dt.Rows.Add(122, "Menu 1-2-2", 12);
dt.Rows.Add(123, "Menu 1-2-3", 12);
dt.Rows.Add(124, "Menu 1-2-4", 12);
dt.Rows.Add(2, "Menu 2", DBNull.Value);
dt.Rows.Add(21, "Menu 2-1", 2);
dt.Rows.Add(211, "Menu 2-1-1", 21);



var source = dt.AsEnumerable();
var list = GetNavBarItems(
        source,
        (r) => r.Field<int?>("ParentId") == null,
        (r, s) => s.Where(x => x.Field<int?>("ParentId") == r.Field<int?>("Id")),
        (r) => new NavBarItem()
        {
            ID = r.Field<int>("Id"),
            Text = r.Field<string>("Name"),
            ParentID = r.Field<int?>("ParentId")
        }).ToList();



Menu 1
   Menu 1-1
       Menu 1-1-1
       Menu 1-1-2
   Menu 1-2
       Menu 1-2-1
       Menu 1-2-2
       Menu 1-2-3
       Menu 1-2-4
Menu 2
    Menu 2-1
        Menu 2-1-1



public class NavBarItem
{
    public NavBarItem()
    {
        Childs = new List<NavBarItem>();
    }
    public int ID { get; set; }
    public int? ParentID { get; set; }
    public string Text { get; set; }
    public List<NavBarItem> Childs { get; set; }
    public override string ToString()
    {
        return Text;
    }
}



private void frmSampleApp_Load(object sender, EventArgs e)
{
    var dt = new DataTable();
    dt.Columns.Add("Id", typeof(int));
    dt.Columns.Add("Name", typeof(string));
    dt.Columns.Add("ParentId", typeof(int));

    dt.Rows.Add(1, "Menu 1", DBNull.Value);
    dt.Rows.Add(11, "Menu 1-1", 1);
    dt.Rows.Add(111, "Menu 1-1-1", 11);
    dt.Rows.Add(112, "Menu 1-1-2", 11);
    dt.Rows.Add(12, "Menu 1-2", 1);
    dt.Rows.Add(121, "Menu 1-2-1", 12);
    dt.Rows.Add(122, "Menu 1-2-2", 12);
    dt.Rows.Add(123, "Menu 1-2-3", 12);
    dt.Rows.Add(124, "Menu 1-2-4", 12);
    dt.Rows.Add(2, "Menu 2", DBNull.Value);
    dt.Rows.Add(21, "Menu 2-1", 2);
    dt.Rows.Add(211, "Menu 2-1-1", 21);

    var source = dt.AsEnumerable();
    var list = GetNavBarItems(
            source,
            (r) => r.Field<int?>("ParentId") == null,
            (r, s) => s.Where(x => x.Field<int?>("ParentId") == r.Field<int?>("Id")),
            (r) => new NavBarItem()
            {
                ID = r.Field<int>("Id"),
                Text = r.Field<string>("Name"),
                ParentID = r.Field<int?>("ParentId")
            }).ToList();

    foreach (var item in list)
    {
        TreeNode parentNode = null;
        parentNode = treeView1.Nodes.Add(item.Text.ToString());

        BindData(Convert.ToInt32(item.ParentID), parentNode);
    }
}

public void BindData(int parentId, TreeNode parentNode)
{
    var dt = new DataTable();
    dt.Columns.Add("Id", typeof(int));
    dt.Columns.Add("Name", typeof(string));
    dt.Columns.Add("ParentId", typeof(int));

    dt.Rows.Add(1, "Menu 1", DBNull.Value);
    dt.Rows.Add(11, "Menu 1-1", 1);
    dt.Rows.Add(111, "Menu 1-1-1", 11);
    dt.Rows.Add(112, "Menu 1-1-2", 11);
    dt.Rows.Add(12, "Menu 1-2", 1);
    dt.Rows.Add(121, "Menu 1-2-1", 12);
    dt.Rows.Add(122, "Menu 1-2-2", 12);
    dt.Rows.Add(123, "Menu 1-2-3", 12);
    dt.Rows.Add(124, "Menu 1-2-4", 12);
    dt.Rows.Add(2, "Menu 2", DBNull.Value);
    dt.Rows.Add(21, "Menu 2-1", 2);
    dt.Rows.Add(211, "Menu 2-1-1", 21);

    var source = dt.AsEnumerable();
    var list = GetNavBarItems(
            source,
            (r) => r.Field<int?>("ParentId") == null,
            (r, s) => s.Where(x => x.Field<int?>("ParentId") == r.Field<int?>("Id")),
            (r) => new NavBarItem()
            {
                ID = r.Field<int>("Id"),
                Text = r.Field<string>("Name"),
                ParentID = r.Field<int?>("ParentId")
            }).ToList();
        TreeNode childNode; 

    foreach (var item in list)
    {
        if (parentNode == null)

            childNode = treeView1.Nodes.Add(item.Text.ToString());

        else

            childNode = parentNode.Nodes.Add(item.Text.ToString());
        BindData(Convert.ToInt32(item.ID.ToString()), childNode); //An unhandled exception of type 'System.StackOverflowException' occurred in System.Windows.Forms.dll
    }
}

private IEnumerable<NavBarItem> GetNavBarItems<T>(
IEnumerable<T> source,
Func<T, Boolean> isRoot,
Func<T, IEnumerable<T>, IEnumerable<T>> getChilds,
Func<T, NavBarItem> getItem)
    {
        IEnumerable<T> roots = source.Where(x => isRoot(x));
        foreach (T root in roots)
            yield return ConvertEntityToNavBarItem(root, source, getChilds, getItem); ;
    }

    private NavBarItem ConvertEntityToNavBarItem<T>(
    T entity,
    IEnumerable<T> source,
    Func<T, IEnumerable<T>, IEnumerable<T>> getChilds,
    Func<T, NavBarItem> getItem)
    {
        NavBarItem node = getItem(entity);
        var childs = getChilds(entity, source);
        foreach (T child in childs)
            node.Childs.Add(ConvertEntityToNavBarItem(child, source, getChilds, getItem));
        return node;
    }
}

public class NavBarItem
{
    public NavBarItem()
    {
        Childs = new List<NavBarItem>();
    }
    public int ID { get; set; }
    public int? ParentID { get; set; }
    public string Text { get; set; }
    public List<NavBarItem> Childs { get; set; }
    public override string ToString()
    {
        return Text;
    }
}