Question

I was working on a WPF project on my PC last night, using VS 2010 Ultimate.

I have just opened it up on my Netbook with VS C# 2010 Express.

When I try to run it, it I am thrown an XAML Parse Exception which tells me that the line:

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

Is the problem. I can’t see a problem with it, I have never changed it and it looks like it is what it should be.

The Error:

'The invocation of the constructor on type 'WpfApplication1.MainWindow' that matches the specified binding constraints threw an exception.' Line number '3' and line position '9'.

Full XAML:

<Window x:Class="WpfApplication1.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Camera" Height="550" Width="826" Background="#ddd" ResizeMode="NoResize" WindowStyle="None" MouseLeftButtonDown="Window_MouseLeftButtonDown" BorderBrush="#FF8D8D8D" BorderThickness="2" >
<Window.Resources>
    <Style TargetType="{x:Type Button}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Button}">
                   <ContentPresenter
              Margin="{TemplateBinding Control.Padding}"
              HorizontalAlignment="{TemplateBinding Control.HorizontalContentAlignment}"
              VerticalAlignment="{TemplateBinding Control.VerticalContentAlignment}"
              SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}"
              ContentTemplate="{TemplateBinding ContentControl.ContentTemplate}"
              RecognizesAccessKey="True"
              Content="{TemplateBinding ContentControl.Content}" />
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</Window.Resources>
<Grid Width="830" Height="510">
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="132" />
        <ColumnDefinition Width="698*" />
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height="29" />
        <RowDefinition Height="319" />
        <RowDefinition Height="121" />
        <RowDefinition Height="16" />
        <RowDefinition Height="25*" />
    </Grid.RowDefinitions>
    <ComboBox Name="PortNames" Height="23" HorizontalAlignment="Left" VerticalAlignment="Top" Width="120" SelectionChanged="PortNames_SelectionChanged" Margin="12,6,0,0" />
    <Ellipse Grid.Row="2"  Height="120" HorizontalAlignment="Left" Name="ellipse1" StrokeThickness="6" VerticalAlignment="Top" Width="120" MouseLeftButtonDown="ellipse1_MouseLeftButtonDown" Margin="12,0,0,0">
        <Ellipse.Fill>
            <LinearGradientBrush EndPoint="1,1" StartPoint="0,0">
                <GradientStop Color="#89FF0000" Offset="0" />
                <GradientStop Color="Red" Offset="1" />
            </LinearGradientBrush>
        </Ellipse.Fill>
        <Ellipse.Stroke>
            <LinearGradientBrush EndPoint="1,1" StartPoint="0,0">
                <GradientStop Color="#FFB10000" Offset="0" />
                <GradientStop Color="#83B20707" Offset="0" />
                <GradientStop Color="#F7B00000" Offset="1" />
            </LinearGradientBrush>
        </Ellipse.Stroke>
    </Ellipse>
    <Button Content="Sync" Height="23" HorizontalAlignment="Left" Margin="57,6,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" Grid.Row="1" />
    <Rectangle Height="23" HorizontalAlignment="Left" Margin="12,6,0,0" Name="rectangle2" Stroke="Black" VerticalAlignment="Top" Fill="Red" Width="39" OpacityMask="#AA000000" Grid.Row="1" />
    <ProgressBar Grid.Row="4"  Height="19" HorizontalAlignment="Left" Name="progressBar1" VerticalAlignment="Top" Width="120" Margin="12,2,0,0" />
    <Rectangle Grid.RowSpan="5" Grid.Column="1" Height="500" Name="rectangle1" Stroke="#aaa" Width="660" Fill="#eee" Margin="12,5,26,5" />
    <Button Grid.Column="1" Height="18" HorizontalAlignment="Left" Margin="630,-20,0,0" Name="image1" VerticalAlignment="Top" Width="40" Click="image1_Click"><Image Stretch="Fill" Source="/PhotoProgram;component/Images/Close.png" /></Button>
    <Button Grid.Column="1" Height="18" HorizontalAlignment="Left" Margin="587,-20,0,0" Name="minimize" VerticalAlignment="Top" Width="40" Click="minimize_Click"><Image Stretch="Fill" Source="/PhotoProgram;component/Images/Minimize.png"  /></Button>
</Grid>

Answer 1

XAMLParseException is a common exception thrown in WPF. Unfortunately it isn’t very helpful.

To help find out what the real error is, you can turn on exception reporting much earlier in Visual Studio. Default key combination is Ctrl + Alt + E. From there, check all the boxes.

Now the exception that is thrown in your code will be highlighted in the debugger.