Passing custom objects to UserControl via XAML binding
What I'm trying to do is create a UserControl to which I can pass an Address object. It seems that when I pass Address="{Binding Path=Person.Address}"
to the UserControl, the embedded TextBox is binding to Text="{Binding Path=Person.Address}"
instead of Text="{Binding Path=Address.Summary}"
Am I going about this all wrong?
Here's a link to the project if you want to play with it: http://dl.dropbox.com/u开发者_运维知识库/4220513/WpfApplication2.zip
Domain objects:
namespace WpfApplication2
{
public class Person
{
public String Name { get; set; }
public Address Address { get; set; }
}
public class Address
{
public String Street { get; set; }
public String City { get; set; }
public String Summary { get { return String.Format("{0}, {1}", Street, City); } }
}
}
MainWindow:
namespace WpfApplication2
{
public partial class MainWindow : Window
{
private readonly ViewModel vm;
public MainWindow()
{
InitializeComponent();
vm = new ViewModel();
DataContext = vm;
vm.Person = new Person()
{
Name = "Bob",
Address = new Address()
{
Street = "123 Main Street",
City = "Toronto",
},
};
}
}
public class ViewModel : INotifyPropertyChanged
{
private Person person;
public Person Person { get { return person; } set { person = value; NotifyPropertyChanged("Person"); } }
public event PropertyChangedEventHandler PropertyChanged;
protected void NotifyPropertyChanged(String propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
}
<Window x:Class="WpfApplication2.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApplication2"
Title="MainWindow" Height="350" Width="525">
<StackPanel>
<TextBlock Text="Name:" />
<TextBlock Text="{Binding Path=Person.Name}" />
<TextBlock Text="Address:" />
<local:AddressView Address="{Binding Path=Person.Address}" />
</StackPanel>
</Window>
UserControl:
namespace WpfApplication2
{
public partial class AddressView : UserControl
{
public AddressView()
{
InitializeComponent();
DataContext = this;
}
public Address Address
{
get { return (Address)GetValue(AddressProperty); }
set { SetValue(AddressProperty, value); }
}
public static readonly DependencyProperty AddressProperty =
DependencyProperty.Register("Address", typeof(Address), typeof(AddressView));
}
}
<UserControl x:Class="WpfApplication2.AddressView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<TextBox Text="{Binding Path=Address.Summary}" IsReadOnly="True" />
</UserControl>
Error:
System.Windows.Data Error: 40 : BindingExpression path error: 'Person' property not found on 'object' ''AddressView' (Name='')'. BindingExpression:Path=Person.Address; DataItem='AddressView' (Name=''); target element is 'AddressView' (Name=''); target property is 'Address' (type 'Address')
In MainWindow.xaml :
<local:AddressView DataContext="{Binding Path=Person.Address}" />
and then in AddressView.xaml
<TextBox Text="{Binding Path=Summary, Mode=OneWay}" IsReadOnly="True" />
This displays the summary for me.
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