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POSize of MessageBox
 

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    <p>How does .NET's <code>MessageBox</code> determine its size relative to the resolution of the screen on which it is displayed?</p> <p>I am writing a slightly more flexible dialog window for a WPF application. The layout of the window is layed out in a Grid:</p> <pre><code>+----------------- | auto: Header // A header for the dialog. +----------------- | auto: Content // can be any FrameworkElement. +----------------- | auto: BottomPanel // With buttons &lt;OK&gt;, &lt;Cancel&gt;, &lt;Delete&gt;, etc. +----------------- </code></pre> <p>The <code>Content</code>cell can be VERY large. In one of my use cases, the user wants to delete <em>x</em> elements from a list. The elements are then listed in the confirmation dialog. If there are many (let's say 50+) elements, the window can get large—too large for my taste.</p> <p>What I would like is a function that determines the <code>MaxHeight</code>and <code>MaxWidth</code>properties of the dialog window from the current screen in a way that mimics Microsoft's own <code>MessageBox</code>dialog.</p> <p>PS: I invoke the message dialog with the following <code>static</code> method:</p> <pre><code>// MessageDialog class public static object Show( Window owner, FrameworkElement content, string title, string header, params MessageDialogButton[] buttons ); /* The MessageDialogButton class has the following properties: * Text, ReturnValue, IsDefault, IsCancel. The class produces * System.Windows.Controls.Button objects that when clicked * return the value of their ReturnValue property--which is then * returned by MessageDialog::Show(...) */ </code></pre> <p>PPS: To determine the screen on which to display the dialog, the screen on which the <code>MessageDialog</code> window's <code>Owner</code> is located. As a fallback, the first (primary) screen is used.</p>
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    1. USMinustar
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    1. COIt's not an answer to your question, but you may be interested in checking out [WindowsAPICodePack](http://archive.msdn.microsoft.com/WindowsAPICodePack) which gives you easy access to Vista+ TaskDialog, which basically is something like more agile and better looking MessageBox. Works on Vista+ only though, but maybe it will suit your needs.
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      1. USMarcin Deptuła
    2. COThis is always the stumbling block for anybody that tries to replace MessageBox. Its auto-scaling is non-trivial to implement yourself. Stop thinking about it as a message box, start thinking about it as just a regular window. Scrollbars and allowing the user to resize the window are normal.
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      1. USHans Passant
    3. COThanks to Kragen's answer and Hans Passant's comment, I've come up with a solution: the window's max width and height are 5/8ths of the width of the screen and 2/3rds of its height. The content gets wrapped in a `ScrollViewer that allows the user to scroll the content if it gets too large. It's not exactly what I wanted, but I don't want to make lots of code to compute the layout multiple times simply to get the size of the message window.
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