WPF元素线程分派器错误 [英] Wpf element thread dispatcher error

问题描述

我有一个图片元素，我只是想从后面的代码中更改图片来源.

这是代码:

I have an image element which I am just trying to change the image source from code behind.

This is the code:

rgbImage.Source = new BitmapImage(new Uri("/Images/Play.png", UriKind.Relative));

这是错误异常:
未处理的异常:System.InvalidOperationException:调用线程不能
访问此对象，因为其他线程拥有它.
在System.Windows.Threading.Dispatcher.VerifyAccess()

谁能提供任何想法?

谢谢进阶

我尝试过的事情:

我尝试了几种不同的技术来访问在其上创建了该元素的调度程序，但是为了我自己，我无法执行这一行.我尝试过的:

System.Windows.Application.Current.Dispatcher.Invoke(new Action(()=>
{
rgbImage.Source =新的BitmapImage(新的Uri("/Images/Play.png"，UriKind.Relative));
})); //同样的错误

rgbImage.Dispatcher.Invoke(new Action(()=>
{
rgbImage.Source =新的BitmapImage(新的Uri("/Images/Play.png"，UriKind.Relative));
})); //冻结应用程序

This is the error exception:
Unhandled Exception: System.InvalidOperationException: The calling thread cannot
access this object because a different thread owns it.
at System.Windows.Threading.Dispatcher.VerifyAccess()

Can anyone provide any ideas?

Thanks in advanced

What I have tried:

I tried several different techniques to access the dispatcher on which this element was created but I cant for the sake of me get this single line executed. What I have tried:

System.Windows.Application.Current.Dispatcher.Invoke(new Action(() =>
{
rgbImage.Source = new BitmapImage(new Uri("/Images/Play.png", UriKind.Relative));
})); // same error

rgbImage.Dispatcher.Invoke(new Action(() =>
{
rgbImage.Source = new BitmapImage(new Uri("/Images/Play.png", UriKind.Relative));
})); // freezes the app

推荐答案

尝试使用BeginInvoke代替.
Dispatcher.BeginInvoke方法(System.Windows.线程) [

Try using BeginInvoke instead.
Dispatcher.BeginInvoke Method (System.Windows.Threading)[^]

rgbImage.Dispatcher.BeginInvoke(new Action(() =>
{
    rgbImage.Source = new BitmapImage(new Uri("/Images/Play.png", UriKind.Relative));
}));

如果图像没有立即更新，则说明有某些东西阻塞了UI线程.您是否阻止了UI线程等待后台线程完成?

If the image doesn''t update immediately, then something is blocking the UI thread. Have you blocked the UI thread waiting for a background thread to finish?

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