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"Styling a Cell" & "INotifyDataErrorInfo" throws InvalidOperationException

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GridView

This is a migrated thread and some comments may be shown as answers.

Michael asked on 09 Apr 2013, 03:46 PM

Hello Forum

I was following your Tutorial about "Styling a Cell" (http://www.telerik.com/help/wpf/gridview-styling-cell.html). My ViewModel implements INotifyDataErrorInfo and exposes Errors through it.

When i am hovering the mouse over the red triangle to see the error tool tip, i get the following Exception: 'xform' name cannot be found in the name scope of 'System.Windows.Controls.Grid'.

Do you have any suggestions?

Thanks,
Michael

Here is my Code:
...by the way: i have prepared a sample solution, but i can't attach it to the post.

MainWindow.xaml:

<Window x:Class="TelerikGridViewCellStyle.MainWindow"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"

xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

xmlns:telerikGridViewCellStyle="clr-namespace:TelerikGridViewCellStyle" mc:Ignorable="d"

Title="MainWindow" Height="350" Width="525" d:DataContext="{d:DesignInstance telerikGridViewCellStyle:ViewModel}">

<Window.Resources>

<Style TargetType="{x:Type telerik:GridViewCell}">

<Setter Property="Template">

<Setter.Value>

<ControlTemplate TargetType="{x:Type telerik:GridViewCell}">

<Grid>

<VisualStateManager.VisualStateGroups>

<VisualStateGroup x:Name="SelectionStates">

<VisualState x:Name="Unselected"/>

<VisualState x:Name="Selected">

<Storyboard>

<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="Background_Selected">

<DiscreteObjectKeyFrame KeyTime="0">

<DiscreteObjectKeyFrame.Value>

<Visibility>Visible</Visibility>

</DiscreteObjectKeyFrame.Value>

</DiscreteObjectKeyFrame>

</ObjectAnimationUsingKeyFrames>

</Storyboard>

</VisualState>

</VisualStateGroup>

<VisualStateGroup x:Name="CommonStates">

<VisualState x:Name="Normal"/>

<VisualState x:Name="Current">

<Storyboard>

<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="Background_Current">

<DiscreteObjectKeyFrame KeyTime="0">

<DiscreteObjectKeyFrame.Value>

<Visibility>Visible</Visibility>

</DiscreteObjectKeyFrame.Value>

</DiscreteObjectKeyFrame>

</ObjectAnimationUsingKeyFrames>

</Storyboard>

</VisualState>

<VisualState x:Name="MouseOver">

<Storyboard>

<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="Background_Over">

<DiscreteObjectKeyFrame KeyTime="0">

<DiscreteObjectKeyFrame.Value>

<Visibility>Visible</Visibility>

</DiscreteObjectKeyFrame.Value>

</DiscreteObjectKeyFrame>

</ObjectAnimationUsingKeyFrames>

</Storyboard>

</VisualState>

</VisualStateGroup>

<VisualStateGroup x:Name="EditingStates">

<VisualState x:Name="Edited">

<Storyboard>

<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Margin" Storyboard.TargetName="PART_ContentPresenter">

<DiscreteObjectKeyFrame KeyTime="0">

<DiscreteObjectKeyFrame.Value>

<Thickness>0</Thickness>

</DiscreteObjectKeyFrame.Value>

</DiscreteObjectKeyFrame>

</ObjectAnimationUsingKeyFrames>

<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="VerticalAlignment" Storyboard.TargetName="PART_ContentPresenter">

<DiscreteObjectKeyFrame KeyTime="0">

<DiscreteObjectKeyFrame.Value>

<VerticalAlignment>Stretch</VerticalAlignment>

</DiscreteObjectKeyFrame.Value>

</DiscreteObjectKeyFrame>

</ObjectAnimationUsingKeyFrames>

<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="PART_CellBorder">

<DiscreteObjectKeyFrame KeyTime="0">

<DiscreteObjectKeyFrame.Value>

<SolidColorBrush Color="White"/>

</DiscreteObjectKeyFrame.Value>

</DiscreteObjectKeyFrame>

</ObjectAnimationUsingKeyFrames>

</Storyboard>

</VisualState>

<VisualState x:Name="Display"/>

</VisualStateGroup>

<VisualStateGroup x:Name="DisabledStates">

<VisualState x:Name="Enabled"/>

<VisualState x:Name="Disabled">

<Storyboard>

<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="PART_CellBorder">

<DiscreteDoubleKeyFrame KeyTime="0" Value="0.4"/>

</DoubleAnimationUsingKeyFrames>

<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="PART_ContentPresenter">

<DiscreteDoubleKeyFrame KeyTime="0" Value="0.7"/>

</DoubleAnimationUsingKeyFrames>

<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="Background_Disabled">

<DiscreteObjectKeyFrame KeyTime="0">

<DiscreteObjectKeyFrame.Value>

<Visibility>Visible</Visibility>

</DiscreteObjectKeyFrame.Value>

</DiscreteObjectKeyFrame>

</ObjectAnimationUsingKeyFrames>

</Storyboard>

</VisualState>

</VisualStateGroup>

<VisualStateGroup x:Name="ValueStates">

<VisualState x:Name="CellValid"/>

<VisualState x:Name="CellInvalid">

<Storyboard>

<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="Background_Invalid">

<DiscreteObjectKeyFrame KeyTime="0">

<DiscreteObjectKeyFrame.Value>

<Visibility>Visible</Visibility>

</DiscreteObjectKeyFrame.Value>

</DiscreteObjectKeyFrame>

</ObjectAnimationUsingKeyFrames>

</Storyboard>

</VisualState>

<VisualState x:Name="InvalidUnfocused">

<Storyboard>

<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="Background_Invalid_Unfocused">

<DiscreteObjectKeyFrame KeyTime="0">

<DiscreteObjectKeyFrame.Value>

<Visibility>Visible</Visibility>

</DiscreteObjectKeyFrame.Value>

</DiscreteObjectKeyFrame>

</ObjectAnimationUsingKeyFrames>

</Storyboard>

</VisualState>

</VisualStateGroup>

</VisualStateManager.VisualStateGroups>

<Border x:Name="PART_CellBorder" BorderBrush="{TemplateBinding VerticalGridLinesBrush}" Background="{Binding Background, RelativeSource={RelativeSource TemplatedParent}}" Margin="1,0,0,0">

<Border.BorderThickness>

<Binding ConverterParameter="Right" Path="VerticalGridLinesWidth" RelativeSource="{RelativeSource TemplatedParent}">

<Binding.Converter>

<telerik:GridLineWidthToThicknessConverter/>

</Binding.Converter>

</Binding>

</Border.BorderThickness>

</Border>

<Border x:Name="Background_Over" BorderBrush="#FFFFC92B" BorderThickness="1" Grid.ColumnSpan="2" Grid.Column="2" CornerRadius="1" Margin="1,1,2,2" Visibility="Collapsed">

<Border BorderBrush="White" BorderThickness="1">

<Border.Background>

<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">

<GradientStop Color="#FFFFFBA3" Offset="1"/>

<GradientStop Color="#FFFFFBDA" Offset="0"/>

</LinearGradientBrush>

</Border.Background>

</Border>

<Border x:Name="Background_Selected" BorderBrush="#FFFFC92B" BorderThickness="1" Grid.ColumnSpan="2" Grid.Column="2" CornerRadius="1" Margin="1,1,2,2" Visibility="Collapsed">

<Border BorderBrush="White" BorderThickness="1">

<Border.Background>

<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">

<GradientStop Color="#FFFCE79F" Offset="1"/>

<GradientStop Color="#FFFDD3A8"/>

</LinearGradientBrush>

</Border.Background>

</Border>

<Border x:Name="Background_Current" BorderBrush="#FF848484" BorderThickness="1" Grid.ColumnSpan="2" Grid.Column="2" CornerRadius="1" Margin="1,1,2,2" Visibility="Collapsed"/>

<Border x:Name="Background_Invalid" BorderBrush="#FFDB000C" BorderThickness="1" Background="White" Grid.ColumnSpan="2" Grid.Column="2" CornerRadius="1" Margin="1,1,2,2" Visibility="Collapsed">

<Border.ToolTip>

<ToolTip x:Name="validationTooltip" Content="{TemplateBinding Errors}" Placement="Right">

<ToolTip.Template>

<ControlTemplate TargetType="{x:Type ToolTip}">

<Grid x:Name="Root" Margin="5,0" Opacity="0" RenderTransformOrigin="0,0">

<Grid.RenderTransform>

<TranslateTransform X="-25"/>

</Grid.RenderTransform>

<VisualStateManager.VisualStateGroups>

<VisualStateGroup x:Name="OpenStates">

<VisualStateGroup.Transitions>

<VisualTransition From="{x:Null}" GeneratedDuration="0" GeneratedEasingFunction="{x:Null}" Storyboard="{x:Null}" To="{x:Null}"/>

<VisualTransition From="{x:Null}" GeneratedDuration="0:0:0.2" GeneratedEasingFunction="{x:Null}" To="Open">

<Storyboard>

<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="X" Storyboard.TargetName="xform">

<SplineDoubleKeyFrame KeyTime="0:0:0.2" Value="0"/>

</DoubleAnimationUsingKeyFrames>

<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="Root">

<SplineDoubleKeyFrame KeyTime="0:0:0.2" Value="1"/>

</DoubleAnimationUsingKeyFrames>

</Storyboard>

</VisualTransition>

</VisualStateGroup.Transitions>

<VisualState x:Name="Closed">

<Storyboard>

<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="Root">

<SplineDoubleKeyFrame KeyTime="0" Value="0"/>

</DoubleAnimationUsingKeyFrames>

</Storyboard>

</VisualState>

<VisualState x:Name="Open">

<Storyboard>

<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="X" Storyboard.TargetName="xform">

<SplineDoubleKeyFrame KeyTime="0" Value="0"/>

</DoubleAnimationUsingKeyFrames>

<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="Root">

<SplineDoubleKeyFrame KeyTime="0" Value="1"/>

</DoubleAnimationUsingKeyFrames>

</Storyboard>

</VisualState>

</VisualStateGroup>

</VisualStateManager.VisualStateGroups>

<Border Background="#052A2E31" CornerRadius="5" Margin="4,4,-4,-4"/>

<Border Background="#152A2E31" CornerRadius="4" Margin="3,3,-3,-3"/>

<Border Background="#252A2E31" CornerRadius="3" Margin="2,2,-2,-2"/>

<Border Background="#352A2E31" CornerRadius="2" Margin="1,1,-1,-1"/>

<Border Background="#FFDC000C" CornerRadius="2"/>

<Border CornerRadius="2">

<ItemsControl>

<ItemsControl.ItemsPanel>

<ItemsPanelTemplate>

<StackPanel IsItemsHost="True"/>

</ItemsPanelTemplate>

</ItemsControl.ItemsPanel>

<ItemsControl.ItemTemplate>

<DataTemplate>

<TextBlock Foreground="White" MaxWidth="250" Margin="8,4" TextWrapping="Wrap" Text="{Binding}"/>

</DataTemplate>

</ItemsControl.ItemTemplate>

</ItemsControl>

</Border>

</Grid>

</ControlTemplate>

</ToolTip.Template>

</ToolTip>

</Border.ToolTip>

<Grid Background="Transparent" HorizontalAlignment="Right" Height="12" Margin="1,-4,-4,0" VerticalAlignment="Top" Width="12">

<Path Data="M1,0L6,0A2,2,90,0,1,8,2L8,7z" Fill="#FFDB000C" Margin="1,3,0,0"/>

<Path Data="M0,0L2,0 8,6 8,8" Fill="White" Margin="1,3,0,0"/>

</Grid>

</Border>

<Border x:Name="Background_Invalid_Unfocused" BorderBrush="#FFCE7D7D" BorderThickness="1" Grid.ColumnSpan="2" Grid.Column="2" CornerRadius="1" Margin="1,1,1,2" Opacity="1" Visibility="Collapsed">

<Border BorderThickness="1">

<Border.BorderBrush>

<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">

<GradientStop Color="#FFEBF4FD"/>

<GradientStop Color="#FFDBEAFD" Offset="1"/>

</LinearGradientBrush>

</Border.BorderBrush>

<Border.Background>

<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">

<GradientStop Color="#FFFCDCDC"/>

<GradientStop Color="#FFFCC1C1" Offset="1"/>

</LinearGradientBrush>

</Border.Background>

</Border>

<Border x:Name="Background_Disabled" BorderBrush="#FFF8F8F8" BorderThickness="1" Background="#FFE0E0E0" Grid.ColumnSpan="2" Grid.Column="2" Margin="0,0,1,1" Visibility="Collapsed"/>

<ContentPresenter x:Name="PART_ContentPresenter" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>

</Grid>

</ControlTemplate>

</Setter.Value>

</Setter>

<Setter Property="Padding" Value="5,0,3,0"/>

<Setter Property="BorderBrush" Value="#FFCBCBCB"/>

<Setter Property="BorderThickness" Value="0,0,1,0"/>

<Setter Property="VerticalContentAlignment" Value="Center"/>

<Setter Property="HorizontalContentAlignment" Value="Stretch"/>

<Setter Property="Background" Value="Transparent"/>

<Setter Property="SnapsToDevicePixels" Value="True"/>

<Setter Property="FocusVisualStyle">

<Setter.Value>

<Style>

<Setter Property="Control.Template">

<Setter.Value>

<ControlTemplate>

<Border BorderBrush="#FF848484" BorderThickness="1" CornerRadius="1" Margin="1,1,2,2"/>

</ControlTemplate>

</Setter.Value>

</Setter>

</Style>

</Setter.Value>

</Setter>

</Style>

</Window.Resources>

<Grid>

<telerik:RadGridView ItemsSource="{Binding Items}" />

</Grid>

</Window>

MainWindow.xaml.cs:

using System.Windows;

namespace TelerikGridViewCellStyle

{

    /// <summary>

    /// Interaction logic for MainWindow.xaml

    /// </summary>

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            InitializeComponent();

            DataContext = new ViewModel();

        }

    }

}

ViewModel.cs:

using System;

using System.Collections;

using System.Collections.ObjectModel;

using System.ComponentModel;

namespace TelerikGridViewCellStyle

{

public class ViewModel

{

public ObservableCollection<DataItem> Items { get; set; }

public ViewModel()

{

Items = new ObservableCollection<DataItem>();

Items.Add(new DataItem {A = "ABC", B = "hihi"});

Items.Add(new DataItem {A = "DEF", B = "hihi"});

Items.Add(new DataItem {A = "GHI", B = "hihi"});

}

public class DataItem : INotifyDataErrorInfo

{

public string A { get; set; }

public string B { get; set; }

public IEnumerable GetErrors(string propertyName)

{

return "Error";

}

public bool HasErrors { get { return true; } }

public event EventHandler<DataErrorsChangedEventArgs> ErrorsChanged;

}

5 Answers, 1 is accepted

Accepted

answered on 10 Apr 2013, 12:10 PM

Hello Michael,

Thank you for sharing your project with Telerik support! For those members of the community, who might be interested in your case I am answering to your question here. Generally you do not see the errors, because the ItemsControl within the ValidationToolTip template is not correctly bound, just set the ItemsSource to the Content of the ToolTip, as shown below:

<Border CornerRadius="2">

<ItemsControl ItemsSource="{TemplateBinding Content}">

<ItemsControl.ItemTemplate>

<DataTemplate>

<TextBlock Margin="8 4 8 4" MaxWidth="250" Foreground="White" Text="{Binding}" TextWrapping="Wrap"/>

</DataTemplate>

</ItemsControl.ItemTemplate>

<ItemsControl.ItemsPanel>

<ItemsPanelTemplate>

<StackPanel />

</ItemsPanelTemplate>

</ItemsControl.ItemsPanel>

</ItemsControl>

</Border>

Have a nice day!

Greetings,
Vanya Pavlova
the Telerik team

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"Styling a Cell" & "INotifyDataErrorInfo" throws InvalidOperationException

5 Answers, 1 is accepted