WPF 合并项目源列表

发布于 2024-09-09 03:16:01 字数 794 浏览 4 评论 0原文

我正在后端类中处理 2 个列表。每个列表都是不同的类型。希望向用户呈现一个列表（包含两个列表的并集），当选择此列表中的项目时，会显示该项目的详细信息。

代码看起来像这样：

我的后端类看起来像这样

public ObservableCollection<Person> People {get;}
public ObservableCollection<Product> Products {get;}

我的 XAML 看起来像这样

<ListBox x:Name="TheListBox" ItemsSource={Some Expression to merge People and Products}>
   <ListBox.Resources>
         People and Product Data Templates
   </ListBox.Resources>
</ListBox>
      ...
<ContentControl Content={Binding ElementName=TheListBox, Path=SelectedItem }>
   <ContentControl.Resources>
         Data Templates for showing People and Product details
   </ContentControl.Resources>
</ContentControl>

有什么建议吗？

原文

I am working with a 2 lists in a backend class. Each list is a different type. Would like to present the user with a single list (containing a union of both lists) of which when an item in this list is selected the item's details appear.

The code will look something like:

My backend class looks somethings like this

public ObservableCollection<Person> People {get;}
public ObservableCollection<Product> Products {get;}

My XAML Looks Something Like This

<ListBox x:Name="TheListBox" ItemsSource={Some Expression to merge People and Products}>
   <ListBox.Resources>
         People and Product Data Templates
   </ListBox.Resources>
</ListBox>
      ...
<ContentControl Content={Binding ElementName=TheListBox, Path=SelectedItem }>
   <ContentControl.Resources>
         Data Templates for showing People and Product details
   </ContentControl.Resources>
</ContentControl>

Any suggestions?

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话少情深 2024-09-16 03:16:01

为此，您可以使用 CompositeCollection。看看这个问题。

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流年已逝 2024-09-16 03:16:01

我不明白为什么你不只是在 ViewModel 中公开这样的属性：

ObservableCollection<object> Items 
{
  get 
  {
    var list = new ObservableCollection<object>(People);
    list.Add(Product);
    return list;
  }
}

然后在你的 xaml 中执行以下操作：

<ListBox x:Name="TheListBox" ItemsSource={Binding Items}>
   <ListBox.Resources>
         People and Product Data Templates
   </ListBox.Resources>
</ListBox>
      ...
<ContentControl Content={Binding ElementName=TheListBox, Path=SelectedItem }>
   <ContentControl.Resources>
         Data Templates for showing People and Product details
   </ContentControl.Resources>
</ContentControl>

更新：

如果你需要以不同的方式操作你的模型，请执行以下操作:

ObservableCollection<object> _Items 
ObservableCollection<object> Items 
{
  get 
  {
    if (_Items == null)
    {
      _Items = new ObservableCollection<object>();
      _Items.CollectionChanged += EventHandler(Changed);
    }
    return _Items;
  }
  set 
  { 
    _Items = value;
    _Items.CollectionChanged += new CollectionChangedEventHandler(Changed);
  }
}

void Changed(object sender,CollectionChangedEventArgs e)
{
  foreach(var item in e.NewValues)
  {
    if (item is Person)
      Persons.Add((Person)item);
    else if (item is Product)
      Products.Add((Product)item);
  }
}

这只是一个例子。但如果您修改上述内容以满足您的需求，它可能会帮助您实现目标

I don't understand why you don't just have expose a property like this in your ViewModel:

ObservableCollection<object> Items 
{
  get 
  {
    var list = new ObservableCollection<object>(People);
    list.Add(Product);
    return list;
  }
}

and then in your xaml you do this:

<ListBox x:Name="TheListBox" ItemsSource={Binding Items}>
   <ListBox.Resources>
         People and Product Data Templates
   </ListBox.Resources>
</ListBox>
      ...
<ContentControl Content={Binding ElementName=TheListBox, Path=SelectedItem }>
   <ContentControl.Resources>
         Data Templates for showing People and Product details
   </ContentControl.Resources>
</ContentControl>

UPDATE:

If you need to manipulate your model differently do the following:

ObservableCollection<object> _Items 
ObservableCollection<object> Items 
{
  get 
  {
    if (_Items == null)
    {
      _Items = new ObservableCollection<object>();
      _Items.CollectionChanged += EventHandler(Changed);
    }
    return _Items;
  }
  set 
  { 
    _Items = value;
    _Items.CollectionChanged += new CollectionChangedEventHandler(Changed);
  }
}

void Changed(object sender,CollectionChangedEventArgs e)
{
  foreach(var item in e.NewValues)
  {
    if (item is Person)
      Persons.Add((Person)item);
    else if (item is Product)
      Products.Add((Product)item);
  }
}

This is just an example. But if you modify the above to meet your needs, it might get you to your goal

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