title: Xamarin: How do I set a placeholder image in my Image element in XAML?
body: <p>In Android, it is quite easy to set a image placeholder for development purposes in an imageview.</p>
  
  <p>All one would do is use the <code>tools:src</code> for the placeholder image during development so you could see it in your layout design preview and your actual image you would put into your <code>android:src</code> 
  . Frequently, you don't set the android:src put would populate that imageview with images that you download off the internet once you connect your app to the net:</p>
  
  <pre><code>&lt;ImageView
                          android:layout_width="28dp"
                          android:layout_height="28dp"
                          android:src=@drawable/activated_icon"
                          tools:src="@mipmap/white_activated_icon" /&gt;
  </code></pre>
  
  <p>In Xamarin, you have this to display images:</p>
  
  <pre><code>&lt;Image Source="http://lorempixel.com/1920/1080/nature/3" /&gt;
  </code></pre>
  
  <p>Once the app connects, the image is downloaded from the internet and displayed. How do I put in a placeholder image for development purposes (similar to the way you would do it through <code>tools:src</code> in android) so I can see it within the layout design previews?</p>