设置Source后，Image ActualWidth / ActualHeight不会直接显示 [英] Image ActualWidth/ActualHeight not displayed directly after setting Source

问题描述

- 我有可供选择的图像。
- 选择图像然后将图像加载到编辑区域。
- 为了使图像居中，我需要获得ActualWidth / ActualHeight属性。

问题：设置图像源时，实际显示图像需要一段时间。我只能在加载/显示时获取这些属性。

现在我正在使用DispatchTimer等到ActualWidth的值大于0.0。我从另一个方法调用以下DispatcherTimer（在ctor初始化方法中声明）（实际代码包含更多行）：

 CenterPictureTimer =  new  DispatcherTimer（）; 
 CenterPictureTimer.Interval =  new  TimeSpan（0,0,0,0,20）; 
 CenterPictureTimer.Tick + =（ object  sender，EventArgs e）=> {
  if （ImageControl.PictureActualWidth == 0.0）
  return ; 
 
 CenterPicture（）; 
 ImageControl.BeginPictureFadeIn（）; 
 CenterPictureTimer.Stop（）; 
}; 
 
 
 

解决方案

Hi Ray，

- I have images to select from.
- Selecting the image should then load the image into an editing area.
- For centering the image I need to get the ActualWidth/ActualHeight properties.

The problem: When setting the image source, it takes a while until the image is actually displayed. I can only get those properties when it got loaded/displayed.

Right now I'm using a DispatchTimer to wait until the ActualWidth has a value above 0.0. and I call the following DispatcherTimer (declared in a ctor Initialize-method) from another method (real code contains more lines):

CenterPictureTimer = new DispatcherTimer();
CenterPictureTimer.Interval = new TimeSpan(0,0,0,0,20);
CenterPictureTimer.Tick += (object sender,EventArgs e) => {
    if (ImageControl.PictureActualWidth == 0.0)
        return;

    CenterPicture();
    ImageControl.BeginPictureFadeIn();
    CenterPictureTimer.Stop();
};

解决方案

Hi Ray,

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