使用对象分组在 WPF 中为树视图创建视图模型

Question

我正在创建一个在 WPF(C#.net) 中聊天的应用程序。 我创建了一个具有以下属性的类用户： 1.公司名称 2.分公司 3.指定 4.用户名 我正在获取类用户的对象列表。 我想在树视图中将用户显示为：

公司名称1 -Branch1 -:指定1 *用户名1 *用户名2 -Branch2 -:指定1 *用户名3 -:指定2 *用户名4

当用户列表被刷新时，树形结构将被重新加载。 考虑到具有相同父级的用户，我想创建此树结构。 当新用户登录时，我在运行时获取用户列表。 如何创建这样的树？ 我想知道，如何使用“ViewModel 并在 WPF 窗口中显示”创建这样的树视图？？

Answer 1

您的问题不够清楚，我猜您的问题是关于如何通过对每个属性进行分组来从用户列表中创建层次结构。

为此，您可以使用 linq 的分组功能。这是第一级的示例，您可以自己重复它以创建层次结构：

        var users = new[] { 
            new {
                CompanyName = "c1",
                Branch = "b1",
                Destination = "d1",
                UserName= "u1",
            },                new {
                CompanyName = "c1",
                Branch = "b1",
                Destination = "d1",
                UserName= "u1",
            },                new {
                CompanyName = "c1",
                Branch = "b1",
                Destination = "d1",
                UserName= "u1",
            },                new {
                CompanyName = "c2",
                Branch = "b1",
                Destination = "d2",
                UserName= "u2",
            },
        };

        var data = from u in users
                   group u by u.CompanyName into ug
                   select new { Node = ug.Key, Childs = ug };


        foreach (var i in data)
        {
            Console.WriteLine(i.Node);
            foreach (var node in i.Childs)
            {
                Console.WriteLine("\t" + node.UserName);
            }
        }

这是带有嵌套分组的代码：

        var users = new[] { 
            new {
                CompanyName = "c1",
                Branch = "b3",
                Destination = "d1",
                UserName= "u1",
            },                new {
                CompanyName = "c1",
                Branch = "b1",
                Destination = "d1",
                UserName= "u1",
            },                new {
                CompanyName = "c1",
                Branch = "b1",
                Destination = "d1",
                UserName= "u1",
            },                new {
                CompanyName = "c2",
                Branch = "b1",
                Destination = "d2",
                UserName= "u2",
            },
        };

        var data = from u1 in users
                   group u1 by u1.CompanyName into gByCompanyName
                   select new
                   {
                       Node = gByCompanyName.Key,
                       Childs = from u2 in gByCompanyName
                                group u2 by u2.Branch into gByBranch
                                select new
                                {
                                    Node = gByBranch.Key,
                                    Childs = from u3 in gByBranch
                                             group u3 by u3.Destination into gByDestination
                                             select new
                                             {
                                                 Node = gByDestination.Key,
                                                 Childs = from u4 in gByDestination
                                                          select new { Node = u4.UserName }
                                             }
                                }
                   };



        foreach (var n1 in data)
        {
            Console.WriteLine(n1.Node);
            foreach (var n2 in n1.Childs)
            {
                Console.WriteLine("\t" + n2.Node);

                foreach (var n3 in n2.Childs)
                {
                    Console.WriteLine("\t\t" + n3.Node);

                    foreach (var n4 in n3.Childs)
                    {
                        Console.WriteLine("\t\t\t" + n4.Node);
                    }
                }
            }
        }

        Console.ReadLine();

我希望这会有所帮助。