WPF图像控制源绑定 [英] WPF Image Control Source Binding

问题描述

我是新来WPF和C＃中，我尝试实现以下功能，但很多尝试后失败。谁能帮我？

我有一个图像控制：

 ＆lt;图像Grid.Row =1×：NAME =ImageEditor拉伸=填充StretchDirection =两者/＆GT;
 

我想这个图像控制源绑定到另一个类的静态属性（ ImageHandler ）

 类ImageHandler
{
    公共静态的BitmapImage ImageToDisplay {搞定;组; }    公共ImageHandler（）{}    .... //其他codeS
}
 

所以每当我在 ImageHandler 类的东西，并更新 ImageToDisplay 属性，我的形象控制系统将显示新的图像。

我尝试几种方法，但他们没有实现这一目标。下面显示了我失败的尝试之一。

 ＆LT; Window.Resources＆GT;
    ＆lt;局部：ImageHandler X：键=ImageHandler＆GT;＆LT; /地方：ImageHandler＆GT;
＆LT; /Window.Resources>＆lt;图像Grid.Row =1×：NAME =ImageEditor拉伸=填充StretchDirection =两者
    来源={绑定源= {静态资源的ResourceKey = ImageHandler}，
    路径= ImageToDisplay，模式=双向}＆GT;
＆LT; /图像＆GT;
 

解决方案

您必须实现为 INotifyPropertyChanged的在 ImageHandler

有关依赖项属性：

 类ImageHandler：INotifyPropertyChanged的
{
    私人的BitmapImage imageToDisplay;
    公众的BitmapImage ImageToDisplay
    {
        {返回imageToDisplay; }
        组
        {
            如果（imageToDisplay！=值）
            {
                imageToDisplay =价值;
                OnPropertyChanged（ImageToDisplay）;
            }
        }
    }    公共ImageHandler（）{}    // ....其他codeS    ＃区域INotifyPropertyChanged的实施
    公共事件PropertyChangedEventHandler的PropertyChanged;    受保护的虚拟无效OnPropertyChanged（字符串propertyName的）
    {
        PropertyChangedEventHandler处理器=的PropertyChanged;
        如果（处理！= NULL）
            处理器（这一点，新PropertyChangedEventArgs（propertyName的））;
    }
    #endregion
}
 

不过，要实现它，我不得不删除静态属性。

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?

I have an image control:

<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)

class ImageHandler
{
    public static BitmapImage ImageToDisplay { get; set; }

    public ImageHandler(){}

    .... //other codes
}

So whenever I do something in the ImageHandler class, and update the ImageToDisplay property, my image control will display the new image.

I have try several methods, but none of them achieved this goal. The following shows one of my failed attempts.

<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>

解决方案

You have to implement either INotifyPropertyChanged in ImageHandler

For dependency property :

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 static attribute.

这篇关于WPF图像控制源绑定的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！