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我想用ListBox的Bindings來顯示一個JSON文件中提供的菜單。問題是,如果我使用下面的代碼,如果我將列表框直接放置在CantineTemplate中,並使用{Binding Meal.Lunch}和{Binding Meal.Dinner},他們會工作,下面的「MenuEntryTemplate」內容不會顯示,所以我想知道爲什麼添加這個額外的級別會破壞代碼。C#/ WP7綁定到包含來自JsonNet的JSON數組的對象?
我有以下片JSON(爲我不能改變格式):
"cantines": [
{
"name": "Canteen A",
"meal": {
"lunch": [
{
"type": "soup",
"name": "Vegetable soup"
},
{
"type": "main",
"name": "Burger with fries"
},
],
"dinner": [
{
"type": "main",
"name": "Chicken breast with rice"
}
]
}
}
]
我反序列化這一點使用Json.Net,這似乎正確反序列化我的對象到下面的數據結構:
public class MenuModel : ViewModelBase
{
public List<Cantines> Cantines { get; set; }
}
public class Cantines
{
public string Name { get; set; }
public Meals Meal { get; set; }
}
public class Meals
{
public List<Lunches> Lunch { get; set; }
public List<Dinners> Dinner { get; set; }
}
public class Lunches
{
public string Type { get; set; }
public string Name { get; set; }
}
public class Dinners
{
public string Type { get; set; }
public string Name { get; set; }
}
我的XAML如下所示:
<DataTemplate x:Key="MealEntryTemplate">
<StackPanel Orientation="Vertical">
<TextBlock Text="{Binding Type}" />
<TextBlock Text="{Binding Name}" />
</StackPanel>
</DataTemplate>
<DataTemplate x:Key="MealTemplate">
<StackPanel>
<!-- These 2 listboxes do not show up, when I leave this MealTemplate out and
use {Binding Meal.Lunch} in the "CantineTemplate" it does work. -->
<ListBox
ItemsSource="{Binding Lunch}"
ItemTemplate="{StaticResource MealEntryTemplate}"
/>
<ListBox
ItemsSource="{Binding Dinner}"
ItemTemplate="{StaticResource MealEntryTemplate}"
/>
</StackPanel>
</DataTemplate>
<DataTemplate x:Key="CantineTemplate">
<ListBox
ItemsSource="{Binding Meal}"
ItemTemplate="{StaticResource MealTemplate}"
/>
</DataTemplate>
<DataTemplate x:Key="MenuTemplate">
<ListBox
ItemsSource="{Binding Cantines}"
ItemTemplate="{StaticResource CantineTemplate}"
/>
</DataTemplate>