具有多个线程时出现WriteableBitmap异常

问题描述

我创建了大约10个执行相同工作的线程-从Internet下载图像.下载完成后，它将引发以下回调函数:

I create about 10 threads doing the same work - downloading image from the Internet. After the download is completed it will raise this callback function:

private void DownloadImageWrapper(IRestResponse response, params object[] args)
{
    byte[] imageData = response.RawBytes;
    using (Stream ms = new MemoryStream(imageData))
    {
        WriteableBitmap wbImg = PictureDecoder.DecodeJpeg(ms);

        callback.DynamicInvoke(wbImg, file);
    };
}

该异常与WriteableBitmap一起抛出.我读到锁将对此有所帮助，但找不到关于应该"锁定的内容的任何信息.有人帮忙吗?

The exception is thrown in line with WriteableBitmap. I read that lock will help with this, but couldn't find anything about "what" I should lock there. Anyone would help?

推荐答案

需要在UI线程上创建WriteableBitmap.

WriteableBitmap needs to be created on the UI thread.

您将必须将所有照片保留为像素阵列(整数或字节)，然后稍后在完成后在UI线程上创建WriteableBitmaps.

You will have to keep all your photos as arrays of pixels (ints or bytes) and then create WriteableBitmaps later, after you're done, on the UI thread.

这篇关于具有多个线程时出现WriteableBitmap异常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！