带图像的WPF自定义控件。 [英] WPF Custom Control with Image.

问题描述

我是 WPF / XAML 的新手，我目前遇到了问题。

I am quite new to WPF/XAML and I am currently facing a problem.

我有一个其中包含两个项目的解决方案，第一个项目是自定义控件库，里面有自定义窗体控件。第二个项目是使用我的自定义窗口表单的WPF应用程序。

I have a solution with two projects in it, the first project is a Custom Control Library with a custom Window form control inside. The second project is a WPF application using my custom window form.

除表单Icon外，所有工作正常。在WPF应用程序项目中，我将窗口图标属性设置为 /ProjectTwoNameSpace;component/Resources/Images/Film.ico ，并在WPF自定义控件中我尝试显示该图像那样：

All work fine except for the form Icon. In the WPF application project I set my window icon property to /ProjectTwoNameSpace;component/Resources/Images/Film.ico, and in the WPF custom control I try to show that image that way :

<Image Grid.Column="0" Margin="3" Width="27" Height="27">
     <Image.Source>
        <BitmapImage UriSource="{Binding Path=Icon}" />
     </Image.Source>
 </Image>

但是它不起作用，我在运行时遇到错误，说该属性 UriSource 或 StreamSource 必须为我的< Image> 标记设置。

But it doesn't work, I get a error at runtime saying that the property UriSource or StreamSource must be set for my <Image> tag.

任何人都可以帮助我吗？我认为这是一个WPF新手问题。

Anyone can help me ? I think it's jsut a WPF newbie problem.

推荐答案

UriSource 属性无法设置 BitmapImage ，因为它是Uri类型，并且您正在尝试将其设置为字符串。我想说完成你正在做的最简单的方法是将你的Image.Source绑定到Icon，然后将字符串转换为位图Image对象。假设您的控件在窗口中，这看起来像这样

The UriSource property of a BitmapImage cannot be set as you have shown because it is of type Uri and you are trying to set it to a string. I'd say the easiest way to accomplish what you're doing is to bind your Image.Source to Icon, and then convert the string to a bitmap Image object. Assuming your control is in a window, this would look something like this

<Window.Resources>
    <converters:StringToBitmapImageConverter x:Key="stringToBitmapImageConverter" />
</Window.Resources>

...

<Image Grid.Column="0" Margin="3" Width="27" Height="27"
    Source="{Binding Path=Icon, Converter={StaticResource stringToBitmapImageConverter}}">
</Image>

然后转换器看起来像：

class StringToBitmapImageConverter: IValueConverter
{
    #region IValueConverter Members

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        BitmapImage image = new BitmapImage();
        image.BeginInit();
        image.UriSource = new Uri(value as string);
        image.EndInit();

        return image;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }

    #endregion
}

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