Provide value on 'System.Windows.Markup.StaticResourceHolder' threw an exception

Question

I am using http://blogs.microsoft.co.il/blogs/justguy/archive/2009/01/19/wpf-combobox-with-checkboxes-as-items-it-will-even-update-on-the-fly.aspx?CommentPosted=true#comment

Answer 1

The problem is because of incorrect order of your styles. I mean that if we publish button style with referrance on static resource NormalBrush, which is declared under the style, like this:

 <Style TargetType="{x:Type Button}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type Button}">
                <Border Background="{StaticResource NormalBrush}" >
                    <ContentPresenter Name="ButtonCont"></ContentPresenter>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>       
</Style>

<LinearGradientBrush x:Key="NormalBrush" StartPoint="0,0" EndPoint="0,1">
    <GradientBrush.GradientStops>
        <GradientStopCollection>
            <GradientStop Color="#FFF" Offset="0.0"/>
            <GradientStop Color="#CCC" Offset="1.0"/>
        </GradientStopCollection>
    </GradientBrush.GradientStops>
</LinearGradientBrush>

This code will give you such error. But if you change, like this

<LinearGradientBrush x:Key="NormalBrush" StartPoint="0,0" EndPoint="0,1">
    <GradientBrush.GradientStops>
        <GradientStopCollection>
            <GradientStop Color="#FFF" Offset="0.0"/>
            <GradientStop Color="#CCC" Offset="1.0"/>
        </GradientStopCollection>
    </GradientBrush.GradientStops>
</LinearGradientBrush>

 <Style TargetType="{x:Type Button}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type Button}">
                <Border Background="{StaticResource ButtonBackground}" >
                    <ContentPresenter Name="ButtonCont"></ContentPresenter>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>       
</Style>

Everything works fine. The same this occures if your resources are stored in different xaml files and you attach them in your ResourceDictionary. For example (cosider we store our NormalBrush in Colors.xaml and Button in Button.xaml). This gives error:

<ResourceDictionary Source="Resources\Button.xaml" />
<ResourceDictionary Source="Resources\Colors.xaml" />

This should work error:

<ResourceDictionary Source="Resources\Colors.xaml" />
<ResourceDictionary Source="Resources\Button.xaml" />

Answer 2

I had stumbled upon this exact problem. There is a problem with the XAML file. SolidBorderBrush is missing from the XAML. By adding it, the sample works fine.

<SolidColorBrush x:Key="SolidBorderBrush" Color="#000" />

Bellow follows the complete contents of the XAML file.

<UserControl x:Class="Controls.ComboWithCheckboxes"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
Height="22" Width="120"
x:Name="UserControl"
>

<UserControl.Resources>
    <LinearGradientBrush x:Key="NormalBrush" StartPoint="0,0" EndPoint="0,1">
        <GradientBrush.GradientStops>
            <GradientStopCollection>
                <GradientStop Color="#FFF" Offset="0.0"/>
                <GradientStop Color="#CCC" Offset="1.0"/>
            </GradientStopCollection>
        </GradientBrush.GradientStops>
    </LinearGradientBrush>

    <LinearGradientBrush x:Key="NormalBorderBrush" StartPoint="0,0" EndPoint="0,1">
        <GradientBrush.GradientStops>
            <GradientStopCollection>
                <GradientStop Color="#CCC" Offset="0.0"/>
                <GradientStop Color="#444" Offset="1.0"/>
            </GradientStopCollection>
        </GradientBrush.GradientStops>
    </LinearGradientBrush>

    <SolidColorBrush x:Key="GlyphBrush" Color="#444" />

    <LinearGradientBrush x:Key="DarkBrush" StartPoint="0,0" EndPoint="0,1">
        <GradientBrush.GradientStops>
            <GradientStopCollection>
                <GradientStop Color="#FFF" Offset="0.0"/>
                <GradientStop Color="#AAA" Offset="1.0"/>
            </GradientStopCollection>
        </GradientBrush.GradientStops>
    </LinearGradientBrush>

    <LinearGradientBrush x:Key="PressedBrush" StartPoint="0,0" EndPoint="0,1">
        <GradientBrush.GradientStops>
            <GradientStopCollection>
                <GradientStop Color="#BBB" Offset="0.0"/>
                <GradientStop Color="#EEE" Offset="0.1"/>
                <GradientStop Color="#EEE" Offset="0.9"/>
                <GradientStop Color="#FFF" Offset="1.0"/>
            </GradientStopCollection>
        </GradientBrush.GradientStops>
    </LinearGradientBrush>

    <SolidColorBrush x:Key="SolidBorderBrush" Color="#000" />

    <SolidColorBrush x:Key="DisabledForegroundBrush" Color="#888" />

    <SolidColorBrush x:Key="DisabledBackgroundBrush" Color="#EEE" />

    <SolidColorBrush x:Key="WindowBackgroundBrush" Color="#FFF" />

    <SolidColorBrush x:Key="SelectedBackgroundBrush" Color="#DDD" />

    <ControlTemplate x:Key="ComboBoxToggleButton" TargetType="ToggleButton">
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition />
                <ColumnDefinition Width="20" />
            </Grid.ColumnDefinitions>
            <Border
              x:Name="Border" 
              Grid.ColumnSpan="2"
              CornerRadius="2"
              Background="{StaticResource NormalBrush}"
              BorderBrush="{StaticResource NormalBorderBrush}"
              BorderThickness="1" />
            <Border 
              Grid.Column="0"
              CornerRadius="2,0,0,2" 
              Margin="1" 
              Background="{StaticResource WindowBackgroundBrush}" 
              BorderBrush="{StaticResource NormalBorderBrush}"
              BorderThickness="0,0,1,0" />
            <Path 
              x:Name="Arrow"
              Grid.Column="1"     
              Fill="{StaticResource GlyphBrush}"
              HorizontalAlignment="Center"
              VerticalAlignment="Center"
              Data="M 0 0 L 4 4 L 8 0 Z"/>
        </Grid>
        <ControlTemplate.Triggers>
            <Trigger Property="ToggleButton.IsMouseOver" Value="true">
                <Setter TargetName="Border" Property="Background" Value="{StaticResource DarkBrush}" />
            </Trigger>
            <Trigger Property="ToggleButton.IsChecked" Value="true">
                <Setter TargetName="Border" Property="Background" Value="{StaticResource PressedBrush}" />
            </Trigger>
            <Trigger Property="IsEnabled" Value="False">
                <Setter TargetName="Border" Property="Background" Value="{StaticResource DisabledBackgroundBrush}" />
                <Setter TargetName="Border" Property="BorderBrush" Value="{StaticResource DisabledBorderBrush}" />
                <Setter Property="Foreground" Value="{StaticResource DisabledForegroundBrush}"/>
                <Setter TargetName="Arrow" Property="Fill" Value="{StaticResource DisabledForegroundBrush}" />
            </Trigger>
        </ControlTemplate.Triggers>
    </ControlTemplate>

    <ControlTemplate x:Key="ComboBoxTextBox" TargetType="TextBox">
        <Border x:Name="PART_ContentHost" Focusable="False" Background="{TemplateBinding Background}" />
    </ControlTemplate>

    <Style x:Key="{x:Type ComboBoxItem}" TargetType="ComboBoxItem">
        <Setter Property="SnapsToDevicePixels" Value="true"/>
        <Setter Property="OverridesDefaultStyle" Value="true"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ComboBoxItem">
                    <Border 
                      Name="Border"
                      Padding="2"
                      SnapsToDevicePixels="true">
                        <ContentPresenter />
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsHighlighted" Value="true">
                            <Setter TargetName="Border" Property="Background" Value="{StaticResource SelectedBackgroundBrush}"/>
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Foreground" Value="{StaticResource DisabledForegroundBrush}"/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</UserControl.Resources>

<ComboBox
    x:Name="CheckableCombo"
    SnapsToDevicePixels="True"
    OverridesDefaultStyle="True"
    ScrollViewer.HorizontalScrollBarVisibility="Auto"
    ScrollViewer.VerticalScrollBarVisibility="Auto"
    ScrollViewer.CanContentScroll="True"
    IsSynchronizedWithCurrentItem="True"
    MinWidth="120"
    MinHeight="20"
    ItemsSource="{Binding ElementName=UserControl, Path=ItemsSource}"
    DataContext="{Binding ElementName=UserControl, Path=DataContext}"
    >
    <ComboBox.ItemTemplate>
        <HierarchicalDataTemplate>
            <CheckBox Content="{Binding Title}"
                      IsChecked="{Binding Path=IsSelected, Mode=TwoWay}"
                      Tag="{RelativeSource FindAncestor, AncestorType={x:Type ComboBox}}"
                      Click="CheckBox_Click"
                      />
        </HierarchicalDataTemplate>
    </ComboBox.ItemTemplate>

    <ComboBox.Template>
        <ControlTemplate TargetType="ComboBox">
            <Grid>
                <ToggleButton 
                    Name="ToggleButton" 
                    Template="{StaticResource ComboBoxToggleButton}" 
                    Grid.Column="2" 
                    Focusable="false"
                    IsChecked="{Binding Path=IsDropDownOpen,Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent}}"
                    ClickMode="Press">
                </ToggleButton>
                <ContentPresenter
                    x:Name="Presenter"
                    IsHitTestVisible="False" 
                    Margin="3,3,23,3"
                    VerticalAlignment="Center"
                    HorizontalAlignment="Left">
                    <ContentPresenter.Content>
                        <TextBlock TextTrimming="CharacterEllipsis"
                                   Text="{Binding Path=Text,Mode=TwoWay,RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl}}" />
                    </ContentPresenter.Content>
                </ContentPresenter>
                <TextBox x:Name="EditableTextBox"
                    Style="{x:Null}" 
                    Template="{StaticResource ComboBoxTextBox}" 
                    HorizontalAlignment="Left" 
                    VerticalAlignment="Center" 
                    Margin="3,3,23,3"
                    Focusable="True" 
                    Background="Transparent"
                    Visibility="Hidden"
                    IsReadOnly="{TemplateBinding IsReadOnly}"/>
                <Popup 
                    Name="Popup"
                    Placement="Bottom"
                    IsOpen="{TemplateBinding IsDropDownOpen}"
                    AllowsTransparency="True" 
                    Focusable="False"
                    PopupAnimation="Slide">
                    <Grid 
                              Name="DropDown"
                              SnapsToDevicePixels="True"                
                              MinWidth="{TemplateBinding ActualWidth}"
                              MaxHeight="{TemplateBinding MaxDropDownHeight}">
                        <Border 
                                x:Name="DropDownBorder"
                                Background="{StaticResource WindowBackgroundBrush}"
                                BorderThickness="1"
                                BorderBrush="{StaticResource SolidBorderBrush}"/>
                        <ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True" DataContext="{Binding}">
                            <StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" />
                        </ScrollViewer>
                    </Grid>
                </Popup>
            </Grid>
            <ControlTemplate.Triggers>
                <Trigger Property="HasItems" Value="false">
                    <Setter TargetName="DropDownBorder" Property="MinHeight" Value="95"/>
                </Trigger>
                <Trigger Property="IsEnabled" Value="false">
                    <Setter Property="Foreground" Value="{StaticResource DisabledForegroundBrush}"/>
                </Trigger>
                <Trigger Property="IsGrouping" Value="true">
                    <Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
                </Trigger>
                <Trigger SourceName="Popup" Property="Popup.AllowsTransparency" Value="true">
                    <Setter TargetName="DropDownBorder" Property="CornerRadius" Value="4"/>
                    <Setter TargetName="DropDownBorder" Property="Margin" Value="0,2,0,0"/>
                </Trigger>
                <Trigger Property="IsEditable"
               Value="true">
                    <Setter Property="IsTabStop" Value="false"/>
                    <Setter TargetName="EditableTextBox" Property="Visibility"    Value="Visible"/>
                    <Setter TargetName="Presenter" Property="Visibility" Value="Hidden"/>
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
    </ComboBox.Template>
</ComboBox>

Answer 3

By using a DynamicResourceinstead of StaticResource, it will find the resource at runtime, so you don't have to worry about the order of the declarations in the XAML.

There may be downsides to this (?), but in particularly sticky cases, this has been the answer to my prayers.

Answer 4

Check the permission for your resource.resx file. At top of your file you will find the dropdown known as Access Modifier : change its type to 'Public'

Answer 5

Please check if you have specified a converter in a Xaml that doesn't exist.