c# - wpf mvvm递归树

Question

我有两个类

public class leaf
{
    public string name { get; set; }
}

和

public class node
{
    public ObservableCollection<node> nodeList = new ObservableCollection<node>();
    public ObservableCollection<leaf> leafList = new ObservableCollection<leaf>();
    public ObservableCollection<node> prop_nodeList { get { return nodeList; } set { nodeList = value; } }
    public ObservableCollection<leaf> prop_leafList { get { return leafList; } set { leafList = value; } }

    public string name { get; set; }
}

正如你可以看到它的工作就像道路或树木。节点可以拥有另一个节点和叶子的信息。

我想在像这样格式化的用户控制树中显示



nethead 是一个主节点，它有两个另外的节点(b，a)。节点 a 有两个节点(b，c)和 2 个叶子(a1，a2)。但我不使用 mvvm。当我用 mvvm 做它时，它看起来像



从 C# 我只做

this.DataContext = mainNode; // its node which hold everething (its named netHead)

从 xaml 它

<Grid>
    <TreeView ItemsSource="{Binding prop_nodeList}">
        <TreeView.Resources>

            <HierarchicalDataTemplate DataType="{x:Type local:node}" ItemsSource="{Binding prop_nodeList}">
                <TextBlock Text="{Binding Path=name}"/>
            </HierarchicalDataTemplate>

            <HierarchicalDataTemplate DataType="{x:Type local:leaf}" ItemsSource="{Binding prop_leafList}">
                <TextBlock Text="{Binding Path=name}"/>
            </HierarchicalDataTemplate>


        </TreeView.Resources>
    </TreeView>
</Grid>

你明白我想做什么了吗？我想在 TreeView 中制作双 treeItem，但它不起作用:(
请帮忙，它是 Ant 算法的项目，我想在教室里做最好的 gui

Answer 1

稍微修改一下您的代码:实现 Root View 模型 NodesData 只是为了演示和创建启动数据。还添加了属性 Children 以具有节点子级的单个属性。并且还稍微修改了 xaml 以使用单个分层数据模板。似乎它有效。

  public class leaf
{
    public string name { get; set; }
}

public class node 
{
    public string name { get; set; }
    public ObservableCollection<node> nodeList = new ObservableCollection<node>();
    public ObservableCollection<leaf> leafList = new ObservableCollection<leaf>();
    public ObservableCollection<node> prop_nodeList { get { return nodeList; } set { nodeList = value; } }
    public ObservableCollection<leaf> prop_leafList { get { return leafList; } set { leafList = value; } }

    public ObservableCollection<object> Children
    {
        get
        {
            var children = prop_nodeList.OfType<object>();
            return new ObservableCollection<object>(children.Concat(prop_leafList.OfType<object>()));
        }
    }

}

public class NodesData 
{
    public ObservableCollection<node> RootSource { get; set; }

    public NodesData()
    {
        var rootNode = new node() { name = ">>>Head Node<<<<" };


        var b = new node() { name = "b" };
        var c = new node() { name = "c" };
        var a = new node()
                    {
                        name = "a",
                        prop_nodeList = new ObservableCollection<node>() { b, c },
                        prop_leafList = new ObservableCollection<leaf>() { new leaf() { name = "a1" }, new leaf() { name = "a2" } }
                    };
        rootNode.prop_nodeList = new ObservableCollection<node>() { b, a };

        RootSource = new ObservableCollection<node>() { rootNode };
    }
}

}

XAML:

    <Grid>
    <Grid.Resources>
        <wpfApplication1:NodesData x:Key="dataSource"/>
    </Grid.Resources>
    <TreeView ItemsSource="{Binding RootSource}" DataContext="{StaticResource dataSource}">
        <TreeView.Resources>

            <HierarchicalDataTemplate DataType="{x:Type wpfApplication1:node}" ItemsSource="{Binding Children}">
                <TextBlock Text="{Binding Path=name}"/>
            </HierarchicalDataTemplate>
            <DataTemplate DataType="{x:Type wpfApplication1:leaf}" >
                <TextBlock Text="{Binding Path=name}"/>
            </DataTemplate>



        </TreeView.Resources>
    </TreeView>
</Grid>