找不到数据绑定属性，为什么？答案

【问题标题】：Databinding Property not found, why?找不到数据绑定属性，为什么？
【发布时间】：2012-04-20 16:39:31
【问题描述】：

请帮助我，为什么这个绑定不起作用，我想从数据上下文为 PlayerBarPresenter 的 PlayerBar.xaml 绑定到 PlayerBarPresenter.Card1.ImgCard 像这样 Source = Binding{Source Card1, Path = ImgCard} 比我得到这个异常

“System.IO.FileNotFoundException”类型的第一次机会异常发生在 mscorlib.dll System.Windows.Data 错误：BindingExpression 路径错误：在“Card1”“System.String”上找不到“ImgCard”属性（哈希码=949723141）。 BindingExpression：路径='ImgCard' DataItem='Card1' (HashCode=949723141);目标元素是 'System.Windows.Controls.Image'（名称=''）；目标属性是“源” （输入“System.Windows.Media.ImageSource”）..

找到文件如果只是在TablePresenter中的同一个属性中，但我想在TablePresenter.Card1.ImgCard中绑定

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");
            }
        }



    }
}

【问题讨论】：

请在随机设置之前阅读属性的文档，我似乎从未看过Binding.Source 的使用方法。

标签： c# wpf silverlight windows-phone-7 xaml

【解决方案1】：

认为你的绑定表达式有问题，请这样尝试：

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

【讨论】：

太棒了；请不要忘记将问题标记为“已回答”！

【解决方案2】：

您将Source 设置为字符串"Card1"，当然它没有您期望的任何属性。由于卡在DataContext 中，您需要扩展Path (Path=Card1.ImgCard)，绑定到DataContext 时切勿设置任何源，否则将使用该源代替DataContext。

【讨论】：