数据库属性未找到，为什么？

Question

请帮助我，为什么这个绑定不起作用，我想从PlayerBar.xaml (数据文本是PlayerBarPresenter )绑定到PlayerBarPresenter.Card1.ImgCard =binding{SourceCard1，Path = ImgCard}，而不是这个异常。

类型'System.IO.FileNotFoundException‘的第一次机会异常发生在mscorlib.dll System.Windows.Data Error: BindingExpression路径错误：'Card1’'System.String‘(HashCode=949723141)上找不到的'ImgCard’属性。BindingExpression: Path='ImgCard‘DataItem=’Card1 1‘(HashCode=949723141)；目标元素是'System.Windows.Controls.Image’(名称=‘’)；目标属性是'Source‘(键入’System.Windows.Media.ImageSource‘)。

如果在TablePresenter中的相同属性中存在该文件，则会找到该文件，但我希望绑定到TablePresenter.Card1.ImgCard中。

UserControl x:Class="poki.View.PlayerBar“数据上下文是TablePresenter

    <Image Width="50" Height="80" Source="{Binding Source=Card1, Path=ImgCard}" RenderTransformOrigin="0.5,0.5" Canvas.Left="108.358"
Canvas.Top="-8.349">

TablePresenter.cs

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using poki.View;
using System.Windows.Media.Imaging;
using poki.Model;

namespace poki.Presenters
{
    public class PlayerBarPresenter : PresenterBase<PlayerBar>
    {

        private BitmapImage playerImage;
        public BitmapImage PlayerImage
        {
            get { return playerImage; }
            set
            {
                playerImage = value;
                OnPropertyChanged("PlayerImage");
            }
        }

        private Card card1;
        public Card Card1
        {
            get { return card1; }
            set
            {
                card1 = value;
                OnPropertyChanged("Card1");
            }
        }



#endregion


        public PlayerBarPresenter(PlayerBar pb) : base(pb)
        {
            Card1 = new Card(22);

            Card1.S = "fasyom";           
        }
    }
}

table.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using poki.Presenters;
using System.Windows.Media.Imaging;
using poki.Model;

namespace poki.View
{
    public partial class Table : PhoneApplicationPage
    {
        public TablePresenter Presenter { get { return this.DataContext as TablePresenter; } }

        public Table()
        {
            this.Loaded += new RoutedEventHandler(Table_Loaded);
            InitializeComponent();
        }

        void Table_Loaded(object sender, RoutedEventArgs e)
        {
            DataContext = new TablePresenter(this); 

            PlayerBarPresenter a = new PlayerBarPresenter(new PlayerBar());


            //a.Card1.ImgCard = new BitmapImage(new Uri("/Datas/Images/1/7.png", UriKind.Relative));
            //a.Card2 = new BitmapImage(new Uri("/Datas/Images/1/7.png",UriKind.Relative));
            gridTable.Children.Add(a.View);
        }




    }
}

card.cs

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Media.Imaging;

namespace poki.Model
{
    public class Card : Notifier
    {
        public int card { get; set; }

        public Card(int Card1)
        {
            card = Card1;
            ImgCard = new BitmapImage(new Uri("/Datas/Images/1/7.png", UriKind.Relative)); //new BitmapImage(new Uri("/Datas/Images/Cards/" + Suit + "/" + Rank + ".png",UriKind.Relative)); 

        }        

        public int Suit
        {
            get { return card / 13; }
        }

        public int Rank
        {
            get { return card % 13; }
        }


        private BitmapImage imgCard;
        public BitmapImage ImgCard
        {
            get { return imgCard; }
            set
            {
                imgCard = value;
                OnPropertyChanged("ImgCard");
            }
        }



    }
}

Answer 1

认为您的绑定表达式是错误的，请尝试如下：

<Image Width="50" Height="80" Source="{Binding Card1.ImgCard}" RenderTransformOrigin="0.5,0.5" Canvas.Left="108.358" Canvas.Top="-8.349">

Answer 2

您将Source设置为字符串"Card1"，当然它没有任何您期望的属性。由于卡在DataContext中，您将希望扩展Path (Path=Card1.ImgCard)，在绑定到DataContext时不要设置任何源，也不要设置将用于代替DataContext的源。