convert array of bytes to bitmapimage

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In the first code example the stream is closed (by leaving the using block) before the image is actually loaded. You must also set BitmapCacheOptions.OnLoad to achieve that the image is loaded immediately, otherwise the stream needs to be kept open, as in your second example.

public BitmapImage ToImage(byte[] array)
{
    using (var ms = new System.IO.MemoryStream(array))
    {
        var image = new BitmapImage();
        image.BeginInit();
        image.CacheOption = BitmapCacheOption.OnLoad; // here
        image.StreamSource = ms;
        image.EndInit();
        return image;
    }
}

From the Remarks section in BitmapImage.StreamSource:

Set the CacheOption property to BitmapCacheOption.OnLoad if you wish
to close the stream after the BitmapImage is created.

Besides that, you can also use built-in type conversion to convert from type byte[] to type ImageSource (or the derived BitmapSource):

var bitmap = (BitmapSource)new ImageSourceConverter().ConvertFrom(array);

ImageSourceConverter is called implicitly when you bind a property of type ImageSource (e.g. the Image control’s Source property) to a source property of type string, Uri or byte[].

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