ListPicker显示对象名称而不是属性 [英] ListPicker shows object name instead of property

问题描述

在我的模型中，我有课:

In my model I have class:

public class Heaviness
{
    public int ID {get; set;}
    public string NameToDisplay {get; set;}
}

在我的视图模型中，我有一个属性HeavinessList:

in my view model I have a property HeavinessList:

public ObservableCollection<Heaviness> HeavinessList {get;set;}

在我的xaml中，我添加了ListPicker，并将项源绑定到HeavinessList；其项目的数据模板已绑定到Heaviness对象的NameToDisplay属性.

In my xaml I added ListPicker with items source binded to HeavinessList; its data template for item is binded to NameToDisplay property of Heaviness object.

<StackPanel x:Name="HeavinessGroup" Width="220" HorizontalAlignment="Left">
    <TextBlock x:Name="HeavinesLabel" Margin="12,0,0,0" TextWrapping="Wrap" 
               Text="Heaviness:" HorizontalAlignment="Left"/>
    <toolkit:ListPicker x:Name="HeavinessListPicker" 
                        SelectedIndex="0"
                        ItemsSource="{Binding HeavinessList}"
                        VerticalAlignment="Center">
        <DataTemplate>
            <TextBlock Text="{Binding NameToDisplay}" />
        </DataTemplate>
    </toolkit:ListPicker>
</StackPanel>

但是，当我运行应用程序时，显示的是对象名称而不是属性.为什么会发生?

However, when I run the app I got the object name displayed instead of property. Why does it happen?

推荐答案

您需要将DataTemplate分配给ItemTemplate属性，而不要直接将其放入ListPicker:

You need to assign your DataTemplate to the ItemTemplate property and don't put it directly into the ListPicker:

<toolkit:ListPicker x:Name="HeavinessListPicker" 
                        SelectedIndex="0"
                        ItemsSource="{Binding HeavinessList}"
                        VerticalAlignment="Center">
    <toolkit:ListPicker.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding NameToDisplay}" />
        </DataTemplate>
    </toolkit:ListPicker.ItemTemplate>
</toolkit:ListPicker>

您可以阅读有关 MSDN上的数据模板的更多信息(本文与WPF有关，但相同概念适用于WP7)

You can read more about DataTemplates on MSDN (the article is about WPF but the same concepts apply for WP7)

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