WPF 图像控件源绑定
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WPF Image Control Source Binding
提问by ZhouningMan
I am new to WPF and C#, I try to implement the following feature, but failed after a lot of attempts. Can anyone help me out?
我是 WPF 和 C# 的新手，我尝试实现以下功能，但在多次尝试后失败了。谁能帮我吗？
I have an image control:
我有一个图像控件：
<Image Grid.Row="1" x:Name="ImageEditor" Stretch="Fill" StretchDirection="Both"/>
I want to bind the source of this image control to a static property of another class (ImageHandler)
我想将此图像控件的源绑定到另一个类的静态属性 ( ImageHandler)
class ImageHandler
{
public static BitmapImage ImageToDisplay { get; set; }
public ImageHandler(){}
.... //other codes
}
So whenever I do something in the ImageHandlerclass, and update the ImageToDisplayproperty, my image control will display the new image.
因此，每当我在ImageHandler类中执行某些操作并更新ImageToDisplay属性时，我的图像控件都会显示新图像。
I have try several methods, but none of them achieved this goal. The following shows one of my failed attempts.
我尝试了几种方法，但没有一种方法能达到这个目标。下面显示了我失败的尝试之一。
<Window.Resources>
<local:ImageHandler x:Key="ImageHandler"></local:ImageHandler>
</Window.Resources>
<Image Grid.Row="1" x:Name="ImageEditor" Stretch="Fill" StretchDirection="Both"
Source="{Binding Source={StaticResource ResourceKey=ImageHandler},
Path=ImageToDisplay,Mode=TwoWay}">
</Image>
采纳答案by Cédric Bignon
You have to implement either INotifyPropertyChangedin ImageHandler
你必须INotifyPropertyChanged在ImageHandler
For dependency property :
对于依赖属性：
class ImageHandler : INotifyPropertyChanged
{
private BitmapImage imageToDisplay;
public BitmapImage ImageToDisplay
{
get { return imageToDisplay; }
set
{
if (imageToDisplay != value)
{
imageToDisplay = value;
OnPropertyChanged("ImageToDisplay");
}
}
}
public ImageHandler() { }
// .... Other codes
#region INotifyPropertyChanged implementation
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
handler(this, new PropertyChangedEventArgs(propertyName));
}
#endregion
}
However, to implement it, I had to remove the staticattribute.
但是，要实现它，我必须删除该static属性。
