WPF: How to bind object to ComboBox

Question

Trying to learn how to bind objects to various types of controls. In this instance, I want to get sample data in my object to appear in ComboBox. The code runs but what appe

Answer 1

Trying to get selected value from combobox returns System.Data.Entity.DynamicProxies.x

 private void Button_Click(object sender, RoutedEventArgs e){
         string _scanner0 = int.Parse(mycmb.SelectedValue.ToString());
         string _scanner1 = mycbr.SelectedItem.ToString();
         string _scanner2 = mycbr.SelectedValuePath.ToString();
         string _scanner3 = mycbr.text.ToString();
     }

all these Returns System.Data.Entity.DynamicProxies.x What should i do?

Answer 2

There are several ways to tell the framework what to display

1) Use DisplayMemberPath on the ComboBox (this will display the named property):

<ComboBox ItemsSource="{Binding Path=Clients}" 
          DisplayMemberPath="Name"
/>

2) Set ItemTemplate on the ComboBox. This is like #1, except allows you to define a template to display, rather than just a property:

<ComboBox ItemsSource="{Binding Path=Clients}">
    <ComboBox.ItemTemplate>
        <DataTemplate>
            <Border BorderBrush="Green" BorderThickness="1" Padding="5">
                <TextBlock Text="{Binding Path=Name,StringFormat='Name: {0}'}" />
            </Border>
        </DataTemplate>
    </ComboBox.ItemTemplate>
</ComboBox>

3) Add a ToString() override to source class. Useful if you always want to display the same string for a given class. (Note that the default ToString() is just the class type name, which is why you see "TheProtect.UserControls.Client".)

public class Client
{
    // ...

    public override string ToString()
    {
        return string.Format("{0} ({1})", Name, ID);
    }
}

4) Add a DataTemplate to the XAML resources. This is useful for associating a given class type with a more complex or stylized template.

<UserControl xmlns:local="clr-namespace:TheProject.UserControls">
    <UserControl.Resources>
        <DataTemplate DataType="local:Client">
            <TextBlock Text="{Binding Name}" />
        </DataTemplate>
    </UserControl.Resources>

    // ...

</UserControl>    

Answer 3

In DisplayMemberPath, give the name of the property which you want to show in the comboBox. In SelectedValuePath, give the name of the property which you want to select. When you do a ComboBox.SelectedValue, you will get the value of this property.