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copied!<p>One ugly, but working, way is to store the bitmap as a PNG in a <a href="http://msdn.microsoft.com/en-us/library/system.io.memorystream%28v=vs.110%29.aspx" rel="nofollow"><code>MemoryStream</code></a>.</p> <p>To save the <a href="http://msdn.microsoft.com/en-us/library/system.drawing.bitmap%28v=vs.110%29.aspx" rel="nofollow"><code>Bitmap</code></a>, you can use the <a href="http://msdn.microsoft.com/en-us/library/ms142147%28v=vs.110%29.aspx" rel="nofollow"><code>Save</code> method</a>:</p> <pre><code>b.Save(myMemoryStream, ImageFormat.Png); </code></pre> <p>That was easy enough. Loading the PNG data into the <a href="http://docs.go-mono.com/?link=T%3aGdk.Pixbuf" rel="nofollow">Gdk# <code>Pixbuf</code></a> is also rather easy; you can use the appropriate constructor:</p> <pre><code>Pixbuf pb = new Gdk.Pixbuf(myMemoryStream); </code></pre> <p>You may need to reset the memory stream so the reading position is at the start of the stream before creating the <code>Pixbuf</code>.</p> <p><em>A word of caution: I do not consider this the best, or even a "good" solution. Transferring data between two object-oriented data structures by serializing and deserializing the data has a certain code smell to it. I genuinely hope someone else can come up with a better solution.</em></p> <p>EDIT: As for the used libraries: This answer uses only plain GDI+ (<code>System.Drawing.Bitmap</code>) and Gdk# (<code>Gdk.Pixbuf</code>). Note that a <a href="http://docs.go-mono.com/?link=T%3aGtk.Image" rel="nofollow"><code>Gtk.Image</code></a> is a widget that displays a <a href="http://docs.go-mono.com/index.aspx?link=T%3aGdk.Pixbuf" rel="nofollow"><code>Gdk.Pixbuf</code></a>. As such, <code>Gtk.Image</code> is the equivalent of Windows Forms' <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.picturebox%28v=vs.110%29.aspx" rel="nofollow"><code>PictureBox</code></a>, whereas <code>Gdk.Pixbuf</code> is roughly equivalent to Windows Forms' <a href="http://msdn.microsoft.com/en-us/library/system.drawing.bitmap%28v=vs.110%29.aspx" rel="nofollow"><code>System.Drawing.Bitmap</code></a>.</p> <p>EDIT2: After testing your code, I have found that there are three additional preconditions to ensure before you can run your minimum example:</p> <ul> <li>As suspected above, you must reset the stream position to the beginning of the <em>after</em> saving your <code>Bitmap</code> and <em>before</em> loading your <code>Pixbuf</code>: <code>ms.Position = 0;</code></li> <li>You must compile the application for <strong>x86</strong> CPUs.</li> <li>You must invoke <code>Gtk.Application.Init();</code> before you do anything with <code>Pixbuf</code>.</li> </ul>

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