Question

我的树木观对Model级有正确的约束力,但我会有一些带孩子的“东京会议”的班轮,我不得不获得我的过急模板,以正确开展工作。

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页: 1

<TreeView.Resources>
    <!-- HierarchicalDataTemplate for ClassModel -->
    <HierarchicalDataTemplate DataType= "{x:Type models:ClassModel}" ItemsSource = "{Binding Path=ChildClasses}">
        <TextBlock Text="{Binding Path=ClassName}"/>
    </HierarchicalDataTemplate>
    <DataTemplate DataType="{x:Type models:CADModel}">
        <TextBlock Text="{Binding Path=PartNumber}"/>
    </DataTemplate>
</TreeView.Resources>

public interface IClassModel : ITreeNode
{
    ObservableCollection<ClassModel> ChildClasses { get; set; }
    ObservableCollection<CADModel>? CADModels { get; set; }
    int ClassId { get; set; }
    int ParentClassId { get; set; }
    string ClassName { get; set; }
    bool HasChildClass { get; set; }
    LibraryModel? ParentLibrary { get; set; }
}

public class ClassModel : TreeNode, IClassModel
{
    public LibraryModel? ParentLibrary { get; set; } = null;
    public int ParentClassId { get; set; } = 0;
    public int ClassId { get; set; } = 0;
    public string ClassName { get; set; } = string.Empty;
    public bool HasChildClass { get; set; } = false;

    public ObservableCollection<ClassModel> ChildClasses { get; set; } = new ObservableCollection<ClassModel>();
    public ObservableCollection<CADModel>? CADModels { get; set; } = null;

    public ClassModel()
    {
        if (HasChildClass == false)
        {
            CADModels = new ObservableCollection<CADModel>()
            {
                new CADModel()
                {
                    Id = 0,
                    PartNumber = "Bob",
                    Revision = "A.1"
                }
            };
        }
    }
}

public interface ICADModel : ITreeNode
{
    string PartNumber { get; set; }
    string Revision { get; set; }
}
public class CADModel :TreeNode, ICADModel
{
    public string PartNumber { get; set; } = string.Empty;
    public string Revision { get; set; } = string.Empty;
}

“entergraph

I was expecting that i would see one CADmodel leaf called "Bob" below every ClassModel node

Answer 1

AHierarchicalDataTemplate 只能对其<代码>儿童进行单独收集。

因此,在您的<代码>中,添加了新的计算财产。

public List<TreeNode> AllChildren => ChildClasses.Cast<TreeNode>().Union(CADModels).ToList();

and change the binding for ItemsSource in your HierarchicalDataTemplate to reference this new AllChildren property instead.

虽然AllChildren list is only a Collection of TreeNode items,但树木观察控制将检查每个儿童项目的实际类型,并使用每个项目的指定数据模板。

It doesn t matter if a particular ClassModel can have either child classes or cad models, or both.

如果你真的在树苗展示后添加儿童课堂或卡片模型,那么,你将需要处理你可以观察的“Changed的活动,以更新这一“AllChildren”财产。否则,取代可观察的Collection<>用清单和编号宣布的推进剂;相反。

此外,除非你有良好理由,否则,在只有一个项目执行的情况下,没有必要为每一种物体建立接口。

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