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POAuto Height in combination with MaxHeight
 

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    <p>I am facing a problem with setting the following xaml layout:</p> <p>RowHeightAuto.xaml</p> <pre><code>&lt;Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="GridMaxHeight.RowHeightAuto" Title="RowHeightAuto" WindowState="Maximized"&gt; &lt;Grid&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition /&gt; &lt;RowDefinition Height="Auto" MaxHeight="200" /&gt; &lt;/Grid.RowDefinitions&gt; &lt;StackPanel Background="LightGray" Grid.Row="0"&gt;&lt;/StackPanel&gt; &lt;DataGrid Name="DataGrid1" Grid.Row="1" /&gt; &lt;/Grid&gt; </code></pre> <p></p> <p>The DataGrid1 control isn't showing any scrollbars with a lot of columns and rows defined. Everything works find when I would replace the Height="Auto" with Height="*" than Horizontal and Vertical scrollbars appear like expected.</p> <p>Also it works when I would declare the MaxHeight directly at the DataGrid1, but that's not really want I want.</p> <p>Is this a bug that the childcontrol ignores the maxheight on setting Height="Auto" or am I propably making something wrong? Same behaviour can be reproduced with ListBox/ListView and so on, also with third party controls like ComponentOne, Telerik...</p> <p>If it's a bug - do you know a workaround or have other hints for me?</p> <p>Here is the code how I set the ItemsSource of the DataGrid. RowHeightAuto.xaml.cs</p> <pre><code>public partial class RowHeightAuto : Window { private readonly DateTime _start; public RowHeightAuto() { InitializeComponent(); DataGrid1.ItemsSource = GetTestData(); _start = DateTime.Now; Dispatcher.BeginInvoke(new Action(() =&gt; MessageBox.Show((DateTime.Now - _start).TotalSeconds.ToString(CultureInfo.InvariantCulture))), DispatcherPriority.ContextIdle, null); } public static List&lt;TestData&gt; GetTestData() { const int maxCols = 501; const int maxRows = 300; var testDatas = new List&lt;TestData&gt;(maxRows); for (int i = 0; i &lt; maxRows; i++) testDatas.Add(new TestData()); for (int i = 0; i &lt; maxCols; i++) { string propName = string.Format("Property{0}", AddLeadingZeros(i)); for (int j = 0; j &lt; maxRows; j++) testDatas[j][propName] = propName; } return testDatas; } private static string AddLeadingZeros(int val) { return val.ToString(CultureInfo.InvariantCulture).PadLeft(3, '0'); } } public class TestData { public object this[string propertyName] { get { var myType = GetType(); var myPropInfo = myType.GetProperty(propertyName); return myPropInfo.GetValue(this); } set { var myType = GetType(); var myPropInfo = myType.GetProperty(propertyName); myPropInfo.SetValue(this, value, null); } } public string Property000 { get; set; } public string Property001 { get; set; } public string Property002 { get; set; } public string Property003 { get; set; } ... public string Property498 { get; set; } public string Property499 { get; set; } public string Property500 { get; set; } } </code></pre>
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    1. CO+1 for a decently formatted and documented first question. Welcome to SO :)
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    2. COAnd please not that you could write `string.Format("Property{0:000}", i)` instead of calling your `AddLeadingZeros` method.
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    3. CO@ Viv: Thanks. :) @ Clemens: Thanks for the input. I am a noob with string formats. :)
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