绑定到BitmapImage [英] Binding to BitmapImage

问题描述

public class Thumbnail：INotifyPropertyChanged
{
public BitmapImage testimage {get;组; }
Thumbnail（）
{
testimage = new BitmapImage（new Uri（http://www.diseno-art.com/news_content/wp-content/uploads/2012/09/ 2013-Jaguar-F-Type-1.jpg））;
}
}

自定义控件中的图像元素： p>

 < Image x：Name =previewImagex：FieldModifier =publicMargin =8Horizo​​ntalAlignment =StretchVerticalAlignment =StretchSource ={Binding Path = thumbnail.testimage}Stretch =Fill/> 
  

当我创建一个控件时，我这样做：

  MyControl MC = new MyControl（）; 
 MC.DataContext = new Thumbnail（）; 
  

图像不显示 - 为什么？

解决方案

XAML：

  x：Name =previewImagex：FieldModifier =publicMargin =8Horizo​​ntalAlignment =StretchVerticalAlignment =StretchSource ={Binding Path = testimage}Stretch =Fill/> 
  

代码（更清洁）：

  public class Thumbnail：INotifyPropertyChanged 
 {
 private BitmapImage tmpbmp; 
 public BitmapImage testimage {get {return tmpbmp; } set {tmpbmp = value; OnPropertyChanged（testimage）; }} 
 public Thumbnail（）
 {
 tmpbmp = new BitmapImage（new Uri（http://www.diseno-art.com/news_content/wp-content/uploads/2012/ 09/2013-Jaguar-F-Type-1.jpg））; 
} 
 
 
 public event PropertyChangedEventHandler PropertyChanged; 
 
 protected virtual void OnPropertyChanged（string propertyName）
 {
 PropertyChangedEventHandler handler = PropertyChanged; 
 if（handler！= null）
 handler（this，new PropertyChangedEventArgs（propertyName））; 
} 
} 
  

    public class Thumbnail : INotifyPropertyChanged
    {
        public BitmapImage testimage { get; set; }
        Thumbnail()
        {
            testimage = new BitmapImage(new Uri("http://www.diseno-art.com/news_content/wp-content/uploads/2012/09/2013-Jaguar-F-Type-1.jpg"));
        }
    }

And a image element in a custom control:

<Image x:Name="previewImage" x:FieldModifier="public" Margin="8" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Source="{Binding Path=thumbnail.testimage}" Stretch="Fill" />

When i create a control, i do this:

MyControl MC = new MyControl();
MC.DataContext = new Thumbnail();

And image doesn't show up - why?

解决方案

XAML:

<Image x:Name="previewImage" x:FieldModifier="public" Margin="8" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Source="{Binding Path=testimage}" Stretch="Fill" />

code (cleaner):

 public class Thumbnail : INotifyPropertyChanged
        {
            private BitmapImage tmpbmp;
            public BitmapImage testimage { get { return tmpbmp; } set { tmpbmp = value; OnPropertyChanged("testimage"); } }
            public Thumbnail()
            {
                tmpbmp = new BitmapImage(new Uri("http://www.diseno-art.com/news_content/wp-content/uploads/2012/09/2013-Jaguar-F-Type-1.jpg"));
            }


            public event PropertyChangedEventHandler PropertyChanged;

            protected virtual void OnPropertyChanged(string propertyName)
            {
                PropertyChangedEventHandler handler = PropertyChanged;
                if (handler != null)
                    handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }

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