c# - 将 byte[] 转换为图像 Windows Phone

Question

当我想从字节数组“创建”图像到 image.Source (XAML) 时，我遇到了一个小问题...首先我从 web 保存字节数组

string pomocna = responseS.GetValue("slika").ToString();
            byte[] pomocnoPolje = new byte[pomocna.Length];
            int brojac = 0;
            foreach (char a in pomocna)
            {
                pomocnoPolje[brojac] = byte.Parse(a.ToString());
                brojac++;
            }
            nova.slika = pomocnoPolje;

然后我设置图片来源

stranica.slika.Source = ConvertToBitmapImage(nova.slika)

问题出现在我的 ConvertToBitmapImage 方法上

public static BitmapImage ConvertToBitmapImage(byte[] image)
    {
        var bitmapImage = new BitmapImage();
        var memoryStream = new MemoryStream(image);
        bitmapImage.SetSource(memoryStream);
        return bitmapImage;
    }

在线

bitmapImage.SetSource(memoryStream);

有人知道怎么解决吗？先谢谢了

Answer 1

如果您的 byte[] 图像 是 JPEG 并且您想要保留内存流，请执行以下操作:

public static BitmapImage ConvertToBitmapImage(byte[] image)
{
    WriteableBitmap wb = null;

    using (MemoryStream ms = new MemoryStream(image))
    {
        try
        {
            wb = Microsoft.Phone.PictureDecoder.DecodeJpeg(ms);
        }
        catch (Exception ex)
        {
            string error_message = ex.Message;
        }
    }

    return ConvertWBtoBI(wb);
}

// converts a WriteableBitmap to a BitmapImage
private BitmapImage ConvertWBtoBI(WriteableBitmap wb)
{
    if(wb == null)
       return null;

    BitmapImage bi;

    using (MemoryStream ms = new MemoryStream())
    {
        wb.SaveJpeg(ms, wb.PixelWidth, wb.PixelHeight, 0, 100);
        bi = new BitmapImage();
        bi.SetSource(ms);
    }

    return bi;
}