wpf 根据类型选择数据模板
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/35493146/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Selecting a data template based on type
提问by kskyriacou
I've declared the following types:
我已经声明了以下类型：
public interface ITest { }
public class ClassOne : ITest { }
public class ClassTwo : ITest { }
In my viewmodel I'm declaring and initializing the following collection:
在我的视图模型中，我声明并初始化了以下集合：
public class ViewModel
{
public ObservableCollection<ITest> Coll { get; set; } = new ObservableCollection<ITest>
{
new ClassOne(),
new ClassTwo()
};
}
In my view I'm declaring the following ItemsControl
在我看来，我声明如下 ItemsControl
<ItemsControl ItemsSource="{Binding Coll}">
<ItemsControl.Resources>
<DataTemplate DataType="local:ClassOne">
<Rectangle Width="50" Height="50" Fill="Red" />
</DataTemplate>
<DataTemplate DataType="local:ClassTwo">
<Rectangle Width="50" Height="50" Fill="Blue" />
</DataTemplate>
</ItemsControl.Resources>
</ItemsControl>
What I expect to see is a red square followed by a blue square, instead what I see is the following:
我希望看到的是一个红色方块后跟一个蓝色方块，而不是我看到的是以下内容：
What am I doing wrong?
我究竟做错了什么？
回答by Amadeusz Wieczorek
Your issue might be caused by finnicky workings of XAML. Specifically, you need to pass Typeto DataType, but you were passing a string with the name of the type.
您的问题可能是由 XAML 的工作原理引起的。具体来说，您需要传递Type给DataType，但是您传递的是一个带有类型名称的字符串。
Use x:Typeto decorate the value of DataType, like so:
使用x:Type装饰的价值DataType，就像这样：
<ItemsControl ItemsSource="{Binding Coll}">
<ItemsControl.Resources>
<DataTemplate DataType="{x:Type local:ClassOne}">
<Rectangle Width="50" Height="50" Fill="Red" />
</DataTemplate>
<DataTemplate DataType="{x:Type local:ClassTwo}">
<Rectangle Width="50" Height="50" Fill="Blue" />
</DataTemplate>
</ItemsControl.Resources>
</ItemsControl>
