问题的背景

我有一个继承自主窗口的类并实现定制的IProcessSimulator接口，因为我希望将来使用不同的类 . 目前，该类存储了Grid元素和TextBlock的定义（以及它的格式，但仅限于暂时） .

我的想法是在运行时创建此（以及任何其他未来）类的不同实例，因此我创建了一个类型为IProcessSimulator的Observable集合来存储它们 . 我有一个Canvas，我想将这些类定义的元素添加到Canvas中 .

问题

主要的问题是，无论我设置什么属性，控件都不会显示在Canvas上，实际上，Visual Studio甚至不允许我将实例添加到画布，说明Specified Visual已经是另一个Visual的子项或CompositionTarget的根，虽然我没有在其他任何地方将它添加到Canvas . 我怀疑这与我的接口类型集合有关，因为 canvasName.Children.Add() 实际上将我的元素添加到另一个集合（UIElement Collection），但我对WPF相对较新 . 以前，我试图通过我的类的构造函数分配像Width和Hight这样的属性，但我也尝试调用函数无济于事 .

相关代码片段

班

class ProcessWindow : MainWindow,  IProcessSimulator
{
    #region Implement: ProcessSimulator
    string content = "<Add content>";
    public string Content
    {
        get
        {
            return content;
        }

        set
        {
            content = value;
        }
    }

    string title = "<Add  Title>";
    public string Title
    {
        get
        {
            return title;
        }

        set
        {
            title = value;
        }
    }

    ProcessType type = ProcessType.Default;
    public ProcessType Type
    {
        get
        {
            return type;
        }
    }

    #endregion



    //constructor for my class
    public ProcessWindow()
    {
        SetMainGrid();
        SetTitleBlock();
    }

    public Grid windowGrid = new Grid();
    public void SetMainGrid()
    {
        //give elements some props for testing purps
        windowGrid.Name = "MainGrid";
        windowGrid.Height = 200;
        windowGrid.Width = 200;
        windowGrid.Background = Brushes.Black;
        windowGrid.Margin = new Thickness(0, 0, 0, 0);

       //this would be the place for MainCanvas.Children.Add(windowGrid)
        Canvas.SetLeft(MainCanvas, 10);
        Canvas.SetTop(MainCanvas, 10);

    }
    public TextBlock titleBlock = new TextBlock();

    public void SetTitleBlock()
    {
        //place for doing another "adding"
        Canvas.SetLeft(titleBlock, 0);
        Canvas.SetTop(titleBlock, 0);

        //give elements some props for testing purps
        //I even tried swapping the order of "Canvas-commands" and property giving
        titleBlock.Name = "TitleBlockName";
        titleBlock.Text = Title;
        titleBlock.Height = 30;
        titleBlock.Width = 30;
        titleBlock.Background = Brushes.Black;
    }

主窗口

public partial class MainWindow : Window
{
    public ObservableCollection<IProcessSimulator> ProcessElements { get; set; }


    public MainWindow()
    {
        InitializeComponent();
        ProcessElements = new ObservableCollection<IProcessSimulator>();
    }

    private void Default_Click(object sender, RoutedEventArgs e)
    {
        //acc to the simple test, the collection is addable and the elements are stored in it
        ProcessElements.Add(new ProcessWindow());
        //ProcessElements[0].Initialize();
        MessageBox.Show("Element number" + ProcessElements.Count.ToString());
    }

我确信这是我身边的一些基本错误，但我似乎无法弄明白 .