提供的 DependencyObject 不是此 Freezable WPF c# 的上下文 [英] The provided DependencyObject is not a context for this Freezable WPF c#

问题描述

我正在尝试用 OpenFileDialog 中的图像填充 Reactangle.

I am trying to fill a Reactanglewith an image from OpenFileDialog.

XAML

<Rectangle RadiusX="15" RadiusY="15">
<Rectangle.Fill>
      <ImageBrush x:Name="userpic" RenderOptions.BitmapScalingMode="Fant" ImageSource="/icons/usericon.png"/>
</Rectangle.Fill>
</Rectangle>

C#

private void LoadImg() {
    System.Windows.Forms.OpenFileDialog ofpd = new System.Windows.Forms.OpenFileDialog();
    ofpd.Filter = "Image Files(*.BMP;*.JPG;*.PNG;*.JPEG)|*.BMP;*.JPG;*.PNG;*.JPEG";
    ofpd.Title = "Add a photo";
    if ((ofpd.ShowDialog == System.Windows.Forms.DialogResult.OK)) {
        userpic.ImageSource = new BitmapImage(new Uri(ofpd.FileName));
    }

}

但是它抛出了一个错误:提供的 DependencyObject 不是这个 Freezable 的上下文...知道为什么会发生这种情况吗?

But it's throwing an error : The provided DependencyObject is not a context for this Freezable...Any idea on why this is happening ?

我已经阅读了这个但是也许我无法应用该解决方案，因为我不是从代码隐藏中创建 ImageBrush...??

I already read this but maybe i cant apply the solution as i am not creating the ImageBrush from code-Behind...??

推荐答案

为矩形指定名称

<Rectangle x:Name="rect" RadiusX="15" RadiusY="15"/>

然后创建一个新的ImageBrush并将其分配给Rectangle的Fill属性:

Then create a new ImageBrush and assign it to the Rectangle's Fill property:

var fill = new ImageBrush(new BitmapImage(new Uri(ofpd.FileName)));
RenderOptions.SetBitmapScalingMode(fill, BitmapScalingMode.Fant);
rect.Fill = fill;

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