WPF TextBlock不顯示自定義項

Question

我有一個程序可以從erp文檔處理源加載圖片，並允許它們通過觸摸或鼠標移動和調整大小。 有一個名為Picture的類：

using System.Windows;
using System.Windows.Controls;

namespace DocumentHandlingTouch
{
    /// <summary>
    /// Interaction logic for Picture.xaml
    /// </summary>
    public partial class Picture : UserControl
    {

        public Picture()
        {
            InitializeComponent();
            DataContext = this;

        }

        public string ImagePath
        {
            get { return (string)GetValue(ImagePathProperty); }
            set { SetValue(ImagePathProperty, value); }
        }

        public string ImageName
        {
            get { return (string)GetValue(ImageNameProperty); }
            set { SetValue(ImageNameProperty, value); }
        }
        public static readonly DependencyProperty ImageNameProperty =
    DependencyProperty.Register("ImageName", typeof(string), typeof(Picture), new UIPropertyMetadata(""));
        // Using a DependencyProperty as the backing store for ImagePath.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty ImagePathProperty =
            DependencyProperty.Register("ImagePath", typeof(string), typeof(Picture), new UIPropertyMetadata(""));

        public string OriginalImagePath
        {
            get { return (string)GetValue(OriginalImagePathProperty); }
            set { SetValue(OriginalImagePathProperty, value); }
        }

        public static readonly DependencyProperty OriginalImagePathProperty =
            DependencyProperty.Register("OriginalImagePath", typeof(string), typeof(Picture), new UIPropertyMetadata(""));

        public double Angle
        {
            get { return (double)GetValue(AngleProperty); }
            set { SetValue(AngleProperty, value); }
        }

        // Using a DependencyProperty as the backing store for Angle.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty AngleProperty =
            DependencyProperty.Register("Angle", typeof(double), typeof(Picture), new UIPropertyMetadata(0.0));




        public double ScaleX
        {
            get { return (double)GetValue(ScaleXProperty); }
            set { SetValue(ScaleXProperty, value); }
        }

        // Using a DependencyProperty as the backing store for ScaleX.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty ScaleXProperty =
            DependencyProperty.Register("ScaleX", typeof(double), typeof(Picture), new UIPropertyMetadata(1.0));

        public double ScaleY
        {
            get { return (double)GetValue(ScaleYProperty); }
            set { SetValue(ScaleYProperty, value); }
        }

        // Using a DependencyProperty as the backing store for ScaleY.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty ScaleYProperty =
            DependencyProperty.Register("ScaleY", typeof(double), typeof(Picture), new UIPropertyMetadata(1.0));

        public double X
        {
            get { return (double)GetValue(XProperty); }
            set { SetValue(XProperty, value); }
        }

        // Using a DependencyProperty as the backing store for X.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty XProperty =
            DependencyProperty.Register("X", typeof(double), typeof(Picture), new UIPropertyMetadata(0.0));


        public double Y
        {
            get { return (double)GetValue(YProperty); }
            set { SetValue(YProperty, value); }
        }

        // Using a DependencyProperty as the backing store for Y.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty YProperty =
            DependencyProperty.Register("Y", typeof(double), typeof(Picture), new UIPropertyMetadata(0.0));
    }
}

這是加載圖片的類。 它使用圖片下方的文本框顯示文件名：

    private void LoadPictures()
    {

        _canvas.Children.Clear();
        double x = -10;
        double y = 0;
        foreach (DictionaryEntry filePath in files)
        {

            try
            {

                Picture p = new Picture();
                ToolTip t = new ToolTip();
                t.Content = filePath.Value;
                p.ToolTip = t;
///////////////////Heres where the textblock is set////////////////
                TextBlock tb = new TextBlock();
                tb.VerticalAlignment = System.Windows.VerticalAlignment.Bottom;
                tb.FontWeight = FontWeights.UltraBlack;
                tb.TextWrapping = TextWrapping.WrapWithOverflow;
                tb.Width = filePath.Value.ToString().ToString().Length * 12;// 125;
                tb.Height = 25;
                tb.Text = filePath.Value.ToString();
                Canvas.SetTop(tb, y+ 25);
                Canvas.SetLeft(tb, x + 25);


//////////////////////////////////////////////////////////////////



                //External Program
                if (Path.GetExtension(filePath.Key.ToString()) == ".pdf")
                {
                    var path = new Uri("pack://application:,,,/Document%20Handling%20Viewer;component/Resources/pdf.png", UriKind.Absolute);
                    p.ImagePath = path.ToString();
                    p.OriginalImagePath = filePath.Key.ToString();
                    p.ImageName = filePath.Value.ToString();


                }
                else
                {
                    p.ImagePath = filePath.Key.ToString();
                    p.OriginalImagePath = filePath.Key.ToString();
                    p.ImageName = filePath.Value.ToString();
                }
                p.Width = 100;
                p.X = x;
                p.Y = y;
                x = x + p.Width + 5;
                if (x + p.Width >= System.Windows.SystemParameters.PrimaryScreenWidth)
                {
                    y = y + 150;
                    x = 0;
                }

                Dispatcher.Invoke((Action)(() => _canvas.Children.Add(p)));
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error:" + ex.Message, "File Load Error", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }
    }

問題在於textblock不會改變其樣式...它不是粗體的，它不是垂直放置在底部的，並且不會包裝。 它只是以普通的舊字體擁抱圖片。 我在這里做錯了什么？

編輯我注釋掉了TextBlock，圖像路徑仍然顯示。 顯示的是ImagePath依賴項屬性嗎？ 我糊塗了

Answer 1

您忘記將textblock添加到畫布：

_canvas.Children.Add(tb);

編輯

如果Picture用戶控件中有文本塊，則不得在后面的代碼中創建新的塊。

在Picture.xaml中，您應該定義文本塊的名稱：

<TextBlock x:Name="TextBlock1 />

在C＃代碼替換行中： TextBlock tb = new TextBlock(); 與：

TextBlock tb = p.TextBlock1;