我试图创建一个字节数组作为它的源图像对象。我究竟做错了什么？

Question

我试图用一个字节数组作为它的源创建的图像对象。我究竟做错了什么？

当我尝试用字节作为源数据的数组来初始化所述图像对象，则抛出异常。唯一的例外是显示在我的代码，如下。

public class MyClass
{
    publuc System.Windows.Media.Imaging.BitmapImage InstanceImage { get; set; }

    public void GetImage()
    {
        // Retrieves a list of custom "Item" objects that contain byte arrays.
        // ScvClnt is our service client. The PollQueue method is designed to return information to us.
        lstQueue = SvcClnt.PollQueue(1);

        // This condition always evaluates as True, since we requested exactly 1 "Item" from the service client.
        if (lstQueue.Count == 1)
        {
            // lstQueue[0].InstanceImage is a byte array containing the data from an image file.
            // I have confirmed that it is a valid TIFF image file, by writing it to disk and opening it in MSPaint.
            if (lstQueue[0].InstanceImage != null)
            {
                // This condition is also True, since the image is just under 3KB.
                if (lstQueue[0].InstanceImage.Length > 0)
                {
                    this.InstanceImage = new System.Windows.Media.Imaging.BitmapImage();
                    this.InstanceImage.BeginInit();
                    this.InstanceImage.StreamSource = new System.IO.MemoryStream(lstQueue[0].InstanceImage);
                    InstanceImage.EndInit();
                    // The call to EndInit throws a NullReferenceException.
                    // {"Object reference not set to an instance of an object."}
                    // I have confirmed that this.InstanceImage and this.InstanceImage.StreamSource are not null at this point.
                    // They are successfully assigned in the lines of code above.
                } else InstanceImage = null;
            } else InstanceImage = null;
        } else InstanceImage = null;
    }
}

我不知道地球上什么可能是想错了。结果 任何建议，将不胜感激。

Answer 1

这MSDN论坛帖子使用这个例子作为解决方案。

using (MemoryStream stream = new MemoryStream(abyteArray0))
{
    image.Source = BitmapFrame.Create(stream, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
}

//The field image should be of type System.Windows.Controls.Image.

我用BitmapFrame.Create方法，它采用仅在流作为参数，和它的工作就像一个魅力。

Answer 2

，我不知道我在下面你想什么你第一眼类的事情，但是，解决原来的问题，给这一个镜头：

    public static Image ConvertByteArrayToImage(byte[] byteArrayIn)
    {
        MemoryStream ms = new MemoryStream(byteArrayIn);
        Image returnImage = Image.FromStream(ms);
        return returnImage;
    }