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WPF: Binding to Anonymous Types from LINQ

Pete Brown - 12 April 2010

When doing some writing on Binding for WPF 4, it occurred to me that many folks don't realize that in WPF, we've long been able to bind to anonymous types returned from LINQ statements, as long as we have property names. Here's a quick example that does a product of two lists to generate some test data:

XAML

<ListBox x:Name="MyListBox">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <StackPanel Margin="10">
                <TextBlock Text="{Binding Name}" FontSize="18" />
                <TextBlock Text="{Binding Role}" />
            </StackPanel>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

 

C#

void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
    string[] names = new string[]
        {
            "Captain Avatar", "Derek Wildstar", "Queen Starsha" 
        };

    string[] roles = new string[]
        {
             
            "Hero", "Captain", "Queen of Iscandar"
        };


    MyListBox.ItemsSource = from n in names 
                            from r in roles
                            select new { Name = n, Role = r };
}

 

Result

image

     
posted by Pete Brown on Monday, April 12, 2010
filed under:      

6 comments for “WPF: Binding to Anonymous Types from LINQ”

  2. Gravatar of David DermanReply
    David Dermansays:
    Monday, April 12, 2010 at 11:28:20 AM
    Does anyone know if we will ever have the ability to do this in Silverlight. The last time I checked binding to an anoymouse type returned from linq queries throws an exception in Silverlight.
  3. Gravatar of Marc ZissReply
    Marc Zisssays:
    Thursday, April 15, 2010 at 4:27:01 PM
    What about:

    string[] names = new string[]

    {

    "Deslock", "Deslock", "Deslock", "Deslock"

    };


    MyListBox.ItemsSource = from n in names
    select new { Name = n };


    ps thanks for coming up and presenting for Philly.Net code camp on Saturday we're getting great feedback
  6. Gravatar of NirReply
    Nirsays:
    Sunday, February 26, 2012 at 8:35:14 PM
    The code missed one small piece: "{Binding Role, Mode=OneTime}", with default mode the code breaks as anonymous types have readonly properties, which does not work with OneWay or OneWayToSource binding which is default.

    <ListBox x:Name="MyListBox" >
    <ListBox.ItemTemplate>
    <DataTemplate>
    <StackPanel Margin="10">
    <TextBox Text="{Binding Name, Mode=OneTime}" FontSize="18"/>
    <TextBox Text="{Binding Role, Mode=OneTime}" />
    </StackPanel>
    </DataTemplate>
    </ListBox.ItemTemplate>
    </ListBox>

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