Pulling different data into ListBox - wpf

Question

How I should to do this? I tried the following:
In Xaml:
<DataTemplate x:Key="LogDataTemplate" DataType="data:Type1">
<TextBlock Text="Type1" />
</DataTemplate>
<DataTemplate x:Key="LogDataTemplate" DataType="data:Type2">
<TextBlock Text="Type2" />
</DataTemplate>
</ResourceDictionary>
</UserControl.Resources>
<ListBox ItemsSource="{Binding source}"
ItemTemplate="{StaticResource LogDataTemplate}" />
</UserControl>
In view model(which is set as DataContext of the UserControl):
member x.source = new ObservableCollection<Object>()
But have an error about duplicates of DataTemplate

Answer 1

Remove the x:Key parameter. Implicit DataTemplates is what you want here.
Edit: Here is a really small working example :
MainWindow.xaml.cs
using System.Collections.ObjectModel;
using System.Windows;
namespace StackOverflow
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
DataContext = this;
Rectangles = new ObservableCollection<object>() { new RedRectangle(), new BlueRectangle() };
}
public ObservableCollection<object> Rectangles { get; set; }
}
public class RedRectangle { }
public class BlueRectangle { }
}
MainWindow.xaml
<Window x:Class="StackOverflow.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:StackOverflow"
Width="500" Height="300">
<Window.Resources>
<DataTemplate DataType="{x:Type local:RedRectangle}">
<Rectangle Width="16" Height="16" Fill="Red" />
</DataTemplate>
<DataTemplate DataType="{x:Type local:BlueRectangle}">
<Rectangle Width="16" Height="16" Fill="Blue" />
</DataTemplate>
</Window.Resources>
<ListBox ItemsSource="{Binding Rectangles}" />
</Window>

Answer 2

Well there's implicit data templates like #Sisyphe mentions.
But your real problem is, you've named both templates the same thing. x:Key is a dictionary key, it needs to be unique within its scope. That's what the error is about.
Having said that, you'll be better off with implicit data templates in this case as #Sisyphe mentions.