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PODataGrid: An ItemsControl is inconsistent with its items source
 

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  1. PODataGrid: An ItemsControl is inconsistent with its items source
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    <p>When I make a call to FillGPLocationAndPrint in the DataGridViewModel class, I get this exception. Below is the inner exception. What happens is a hard coded Dictionary is passed into FillGPLocationAndPrint where it takes the data from there and puts it into the GridData ObservableCollection which is bound to the ItemsSource property of the DataGrid. This raises an event called CollectionChanged, which calls the method GridDataChanged which is responsible for increasing the DataGrid height property and the MainWindow height property. Basically, as rows are added and subtracted, the grid and window height change dynamically.</p> <p><strong>Edit:</strong></p> <p>After looking a little further into this issue, the problem is actually caused by the </p> <pre><code>mainVm.WindowHeight += ROW_HEIGHT; </code></pre> <p>and</p> <pre><code>mainVm.WindowHeight -= ROW_HEIGHT; </code></pre> <p><strong>statements. For some reason, it does not like changing the height of the window. mainVm is an object that represents the ViewModel of the main window and WindowHeight is a double that is bound to the Height property in the main window.</strong></p> <p>Here is InnerException:</p> <p>Information for developers (use Text Visualizer to read this): This exception was thrown because the generator for control 'System.Windows.Controls.DataGrid Items.Count:3' with name 'grdData' has received sequence of CollectionChanged events that do not agree with the current state of the Items collection. The following differences were detected: Accumulated count 2 is different from actual count 3. [Accumulated count is (Count at last Reset + #Adds - #Removes since last Reset).] At index 1: Generator's item '{NewItemPlaceholder}' is different from actual item 'MechQualTestDataEntry.MechTestData'.</p> <p>One or more of the following sources may have raised the wrong events: System.Windows.Controls.ItemContainerGenerator System.Windows.Controls.ItemCollection System.Windows.Data.ListCollectionView System.Collections.ObjectModel.ObservableCollection`1[[MechQualTestDataEntry.MechTestData, MechQualTestDataEntry, Version=2.0.5.25, Culture=neutral, PublicKeyToken=null]] (The starred sources are considered more likely to be the cause of the problem.)</p> <p>The most common causes are (a) changing the collection or its Count without raising a corresponding event, and (b) raising an event with an incorrect index or item parameter.</p> <p>The exception's stack trace describes how the inconsistencies were detected, not how they occurred. To get a more timely exception, set the attached property 'PresentationTraceSources.TraceLevel' on the generator to value 'High' and rerun the scenario. One way to do this is to run a command similar to the following: System.Diagnostics.PresentationTraceSources.SetTraceLevel(myItemsControl.ItemContainerGenerator, System.Diagnostics.PresentationTraceLevel.High) from the Immediate window. This causes the detection logic to run after every CollectionChanged event, so it will slow down the application.</p> <p>Here is the DataGridViewModel class (shrunk down):</p> <pre><code> private const int GRID_HEIGHT_MAX = 390; private const int GRID_HEIGHT_MIN = 60; private const int ROW_HEIGHT = 22; private int prevRowCount; private double gridHeight; private MainWindowViewModel mainVm; private ObservableCollection&lt;MechTestData&gt; gridData; public DataGridViewModel(MainWindowViewModel mainVm) { this.mainVm = mainVm; GridHeight = GRID_HEIGHT_MIN; gridData = new ObservableCollection&lt;MechTestData&gt;(); gridData.CollectionChanged += GridDataChanged; } public double GridHeight { get { return gridHeight; } set { gridHeight = value; OnPropertyChanged("GridHeight"); } } public ObservableCollection&lt;MechTestData&gt; GridData { get { return gridData; } set { gridData = value; OnPropertyChanged("GridData"); } } private void GridDataChanged(object sender, NotifyCollectionChangedEventArgs e) { // If the grid height is less than or equal to // the maximum grid height if (gridHeight &lt;= GRID_HEIGHT_MAX + 1) { // If we added rows, increase the grid height if (gridData.Count &gt; prevRowCount) { GridHeight += ROW_HEIGHT; mainVm.WindowHeight += ROW_HEIGHT; } } // if the grid height is less than or equal to // the minimum grid height if (gridHeight &gt; GRID_HEIGHT_MIN) { // If we deleted rows, decrease the grid height if (gridData.Count &lt; prevRowCount) { GridHeight -= ROW_HEIGHT; mainVm.WindowHeight -= ROW_HEIGHT; } } // Cache the row count prevRowCount = gridData.Count; } public void FillGPLocationAndPrint(Dictionary&lt;string, string&gt; gpLocationToDiePrintMap) { foreach (KeyValuePair&lt;string, string&gt; map in gpLocationToDiePrintMap) { GridData.Add(new MechTestData(map.Key, map.Value)); } } </code></pre> <p>ViewModelBase class:</p> <pre><code>public abstract class ViewModelBase : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; protected void OnPropertyChanged(string propertyName) { PropertyChangedEventHandler handler = PropertyChanged; if (handler != null) { handler(this, new PropertyChangedEventArgs(propertyName)); } } } </code></pre> <p>XAML (minus all the other components):</p> <pre><code>&lt;Window x:Class="MechQualTestDataEntry.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:p="clr-namespace:MechQualTestDataEntry.Properties" xmlns:wpftk="http://schemas.microsoft.com/wpf/2008/toolkit" xmlns:local="clr-namespace:MechQualTestDataEntry" Icon="/MechQualTestDataEntry;component/Resources/MechQualIcon.ico" Title="MainWindow" Background="MidnightBlue" ResizeMode="CanMinimize" Height="{Binding WindowHeight}" MinHeight="{Binding WindowHeight}" MaxHeight="{Binding WindowHeight}" MinWidth="700" MaxWidth="1000" Width="820"&gt; &lt;Window.Resources&gt; &lt;local:DateTimeConverter x:Key="DateTimeFormatter"/&gt; &lt;/Window.Resources&gt; &lt;!-- Data Grid --&gt; &lt;DataGrid DockPanel.Dock="Bottom" x:Name="grdData" CellStyle="{StaticResource cellStyle}" FontFamily="Verdana" Height="{Binding GridHeight}" Foreground="MidnightBlue" AutoGenerateColumns="False" RowHeight="22" CanUserAddRows="True" CanUserDeleteRows="True" CanUserReorderColumns="False" CanUserResizeColumns="False" CanUserResizeRows="False" CanUserSortColumns="True" ItemsSource="{Binding GridData}" SelectionUnit="CellOrRowHeader" SelectionMode="Extended"&gt; &lt;DataGrid.Resources&gt; &lt;Style TargetType="{x:Type DataGridCell}"&gt; &lt;EventSetter Event="PreviewMouseLeftButtonDown" Handler="DataGridCell_PreviewMouseLeftButtonDown"/&gt; &lt;/Style&gt; &lt;Style TargetType="{x:Type DataGridRowHeader}"&gt; &lt;Style.Triggers&gt; &lt;Trigger Property="IsMouseOver" Value="False"&gt; &lt;Setter Property="Background" Value="DeepSkyBlue" /&gt; &lt;Setter Property="BorderBrush" Value="MidnightBlue" /&gt; &lt;Setter Property="BorderThickness" Value="1" /&gt; &lt;Setter Property="Width" Value="15" /&gt; &lt;Setter Property="HorizontalContentAlignment" Value="Right" /&gt; &lt;Setter Property="VerticalContentAlignment" Value="Center" /&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsMouseOver" Value="True"&gt; &lt;Setter Property="Background" Value="MidnightBlue" /&gt; &lt;Setter Property="BorderBrush" Value="DeepSkyBlue" /&gt; &lt;Setter Property="BorderThickness" Value="1" /&gt; &lt;Setter Property="Width" Value="15" /&gt; &lt;Setter Property="HorizontalContentAlignment" Value="Right" /&gt; &lt;Setter Property="VerticalContentAlignment" Value="Center" /&gt; &lt;/Trigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; &lt;/DataGrid.Resources&gt; &lt;DataGrid.Columns&gt; &lt;!-- TO Number --&gt; &lt;DataGridTextColumn Width="40" Binding="{Binding TONumber}"&gt; &lt;DataGridTextColumn.HeaderTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Style="{StaticResource tbkStyleGridHeader}" TextWrapping="Wrap" Text="TO #"/&gt; &lt;/DataTemplate&gt; &lt;/DataGridTextColumn.HeaderTemplate&gt; &lt;/DataGridTextColumn&gt; &lt;!-- GelPak Location --&gt; &lt;DataGridTextColumn Width="60" Binding="{Binding GelPakLocation}"&gt; &lt;DataGridTextColumn.HeaderTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Style="{StaticResource tbkStyleGridHeader}" TextWrapping="Wrap" Text="GelPak Location"/&gt; &lt;/DataTemplate&gt; &lt;/DataGridTextColumn.HeaderTemplate&gt; &lt;/DataGridTextColumn&gt; &lt;!-- Die Print --&gt; &lt;DataGridTextColumn Width="60" Binding="{Binding DiePrint}"&gt; &lt;DataGridTextColumn.HeaderTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Style="{StaticResource tbkStyleGridHeader}" Text="Die Print"/&gt; &lt;/DataTemplate&gt; &lt;/DataGridTextColumn.HeaderTemplate&gt; &lt;/DataGridTextColumn&gt; &lt;!-- Wire Pull Test --&gt; &lt;DataGridTextColumn Width="70" Binding="{Binding WirePullTestValue}"&gt; &lt;DataGridTextColumn.HeaderTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Style="{StaticResource tbkStyleGridHeader}" TextWrapping="Wrap" Text="Wire Pull Test"/&gt; &lt;/DataTemplate&gt; &lt;/DataGridTextColumn.HeaderTemplate&gt; &lt;/DataGridTextColumn&gt; &lt;!-- Failure Mode --&gt; &lt;DataGridTextColumn Width="84" Binding="{Binding FailureMode}"&gt; &lt;DataGridTextColumn.HeaderTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Style="{StaticResource tbkStyleGridHeader}" Text="Failure Mode"/&gt; &lt;/DataTemplate&gt; &lt;/DataGridTextColumn.HeaderTemplate&gt; &lt;/DataGridTextColumn&gt; &lt;!-- Ball Shear --&gt; &lt;DataGridTextColumn Width="70" Binding="{Binding BallShearTestValue}"&gt; &lt;DataGridTextColumn.HeaderTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Style="{StaticResource tbkStyleGridHeader}" TextWrapping="Wrap" Text="Ball Shear Test"/&gt; &lt;/DataTemplate&gt; &lt;/DataGridTextColumn.HeaderTemplate&gt; &lt;/DataGridTextColumn&gt; &lt;!-- Die Shear --&gt; &lt;DataGridTextColumn Width="70" Binding="{Binding DieShearTestValue}"&gt; &lt;DataGridTextColumn.HeaderTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Style="{StaticResource tbkStyleGridHeader}" TextWrapping="Wrap" Text="Die Shear Test"/&gt; &lt;/DataTemplate&gt; &lt;/DataGridTextColumn.HeaderTemplate&gt; &lt;/DataGridTextColumn&gt; &lt;!-- InP Remaining --&gt; &lt;DataGridTextColumn Width="70" Binding="{Binding InPRemaining}"&gt; &lt;DataGridTextColumn.HeaderTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Style="{StaticResource tbkStyleGridHeader}" TextWrapping="Wrap" Text="InP Remaining"/&gt; &lt;/DataTemplate&gt; &lt;/DataGridTextColumn.HeaderTemplate&gt; &lt;/DataGridTextColumn&gt; &lt;!-- Test Result --&gt; &lt;DataGridTextColumn Width="70" Binding="{Binding TestResult}"&gt; &lt;DataGridTextColumn.HeaderTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Style="{StaticResource tbkStyleGridHeader}" TextWrapping="Wrap" Text="Pass/Fail"/&gt; &lt;/DataTemplate&gt; &lt;/DataGridTextColumn.HeaderTemplate&gt; &lt;/DataGridTextColumn&gt; &lt;!-- Notes --&gt; &lt;DataGridTextColumn Width="*" Binding="{Binding Notes}"&gt; &lt;DataGridTextColumn.HeaderTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Style="{StaticResource tbkStyleGridHeader}" TextWrapping="Wrap" Text="Notes"/&gt; &lt;/DataTemplate&gt; &lt;/DataGridTextColumn.HeaderTemplate&gt; &lt;/DataGridTextColumn&gt; &lt;/DataGrid.Columns&gt; &lt;/DataGrid&gt; </code></pre> <p>Any help in solving this problem will much appreciated.</p> <p>Regards,</p> <p>Kyle</p>
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    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. COpossible quick solution off the top of my head: put the offending code in a `Dispatcher.BeginInvoke()`.
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      1. PODataGrid: An ItemsControl is inconsistent with its items source
      1. USFederico Berasategui
    2. COJust tried this and it throws the exact same exception. I put: GridData.Add(new MechTestData(map.Key, map.Value)); inside the dispatcher invoke method.
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      1. PODataGrid: An ItemsControl is inconsistent with its items source
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    3. COI want to also add that my original solution works perfectly on my development machine, but when I deploy it, I get this exception on almost every production machine. All production machines are running the same OS as my dev machine: Windows 7 Professional x64 with .NET 4.0 installed
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      1. PODataGrid: An ItemsControl is inconsistent with its items source
      1. USkformeck
 

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