我正在使用PhotoChooserTask从图库中选择图像,这是我的设置

private void ApplicationBarIconButton_Click(object sender, EventArgs e)
{
    PhotoChooserTask photo = new PhotoChooserTask();
    photo.Completed += photo_Completed;
    photo.Show();
}

void photo_Completed(object sender, PhotoResult e)
{
    if (e.ChosenPhoto != null)
    {
        WriteableBitmap wbmp1 = PictureDecoder.DecodeJpeg(e.ChoosenPhoto, (int)scrnWidth, (int)scrnHeight);
        ImageBrush iBru = new ImageBrush();
        iBru.ImageSource = wbmp1;
        iBru.Stretch = Stretch.Fill;
        ContentPanel.Background = iBru;
    }
}


问题:以这种方式仅适用于.JPEG图片

为了使其与其他image formats一起使用,我尝试了以下方法:

void photo_Completed(object sender, PhotoResult e)
{
    if (e.ChosenPhoto != null)
    {
        WriteableBitmap wBmp = new WriteableBitmap(0, 0);//6930432
        wBmp.SetSource(e.ChosenPhoto);//23105536
        MemoryStream tmpStream = new MemoryStream();//23105536
        wBmp.SaveJpeg(tmpStream, (int)scrnWidth, (int)scrnHeight, 0, 100);//22831104
        tmpStream.Seek(0, SeekOrigin.Begin);//22831104

        WriteableBitmap wbmp1 = PictureDecoder.DecodeJpeg(tmpStream, (int)scrnWidth, (int)scrnHeight);//24449024
        ImageBrush iBru = new ImageBrush();//24449024
        iBru.ImageSource = wbmp1;//24449024
        iBru.Stretch = Stretch.Fill;
        ContentPanel.Background = iBru;
    }
}


这种方式适用于不同的图像格式,但存储效率不高。

为了更好的理解,我在每行之后提到了bytes的数量。

问题:在后面的代码片段中,我不再需要wbmp,如何清除wbmp对象使用的内存?

最佳答案

摆脱WriteableBitmap,改为执行以下操作:

var bmp = new System.Windows.Media.Imaging.BitmapImage();
bmp.SetSource( e.ChosenPhoto );
var ib = new ImageBrush() { ImageSource = bmp, Stretch = Stretch.Fill };
ContentPanel.Background = ib;

关于c# - 如何清除WriteableBitmap的内存,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/26341861/

10-10 10:13