我是MVVM和WPF的新手，我有以下模型，我希望使用数据绑定向用户显示它（下面还提供了viewmodel和xaml的代码）。但我不确定缺少什么，因为根本没有在UI上显示用户列表。谁能告诉我我的代码中缺少哪些内容？！
如果使用Class of Users，我使用User类中的List：
private List<User> _UsersList;
public List<User> users
{
get { return _UsersList; }
set { _UsersList = value; }
}
，然后招架工作！，但如果我使用Users类，绑定不起作用！
型号：
public class User : ObservableObject
{
public int ID { get; set; }
public string Name { get; set; }
public int Age { get; set; }
public bool IsPremiumUser { get; set; }
public string selectedItem { get; set; }
public string SelectedValue
{
get { return selectedItem; }
set
{
selectedItem = value;
// suser.age = Convert.ToInt32(value);
RaisePropertyChangedEvent("SelectedValue");
}
}
public int[] myItem { get; set; }
public int[] UserItems
{
get { return myItem; }
set { myItem = value; }
}
private SelectedUser suser = new SelectedUser();
public int selected { get; set; }
public int Selected
{
get { return selected; }
set
{
selected = value;
suser.age = Convert.ToInt32(value);
RaisePropertyChangedEvent("Selected");
}
}
}
public class Users : ObservableObject
{
private List<User> mylist = new List<User>();
private List<User> list
{
get { return mylist; }
set
{
mylist = value;
}
}
public void Add(User user)
{
this.list.Add(user);
}
public User GetById(int id)
{
return this.list.First(u => u.ID == id);
}
}
视图模型：
public class ViewModel : ObservableObject
{
public ViewModel()
{
users = new Users();
for (int i = 0; i < 100000; ++i)
{
int[] numbers;
numbers = new int[3] { 1, 2, 3 };
var user = new User { ID = i, Name = "Name " + i.ToString(), Age = 20 + i, UserItems = numbers, SelectedValue = "0" };
if (i == 2 || i == 4)
{
user.IsPremiumUser = true;
}
users.Add(user);
}
}
private Users _UsersList;
public Users users
{
get { return _UsersList; }
set { _UsersList = value; }
}
private int _currenuser;
public int CurrentUser
{
get
{
return _currenuser;
}
set
{
_currenuser = value;
RaisePropertyChangedEvent("CurrentUser");
}
}
}
XAML：
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApplication1"
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
Icon="C:\Users\maninx2\Documents\Visual Studio 2013\Projects\SampleFormMaker1\WpfApplication1\abbott_point_of_care_HuT_icon.ico"
Title="MainWindow" Height="700" Width="1249.129">
<Window.Resources>
<DataTemplate x:Key="NormalUserDataTemplate">
<StackPanel>
<TextBlock Text="{Binding Name}" />
<TextBox Text="{Binding SelectedValue, UpdateSourceTrigger=PropertyChanged}" Width="300" />
</StackPanel>
</DataTemplate>
<DataTemplate x:Key="PremiumUserDataTemplate">
<StackPanel Background="LightBlue">
<ComboBox SelectedIndex="{Binding SelectedValue, UpdateSourceTrigger=PropertyChanged}" Text="{Binding Name}" Width="300" ItemsSource="{Binding UserItems}"/>
</StackPanel>
</DataTemplate>
<local:PremiumUserDataTemplateSelector x:Key="myPremiumUserDataTemplateSelector" />
</Window.Resources>
<TabControl Name="TabControl1">
<TabControl.ItemContainerStyle>
<Style TargetType="{x:Type TabItem}">
<Setter Property="Visibility" Value="Collapsed"/>
</Style>
</TabControl.ItemContainerStyle>
<TabItem Header="General">
<ScrollViewer VerticalScrollBarVisibility="Auto">
<StackPanel Height="800" Orientation="Horizontal" >
<ListView x:Name="myListView" ItemsSource="{Binding users, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" ItemTemplateSelector="{StaticResource myPremiumUserDataTemplateSelector}" SelectedIndex="{Binding CurrentUser, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
</ListView>
<ListView x:Name="myListView1" ItemsSource="{Binding users, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" HorizontalAlignment="Stretch" >
<ListView.View>
<GridView>
<GridViewColumn Width="140" Header="Selected Values"
DisplayMemberBinding="{Binding SelectedValue}" />
</GridView>
</ListView.View>
</ListView>
<Button Content="Next"
HorizontalAlignment="Left"
Margin="10,10,0,0"
VerticalAlignment="Top"
Width="75"
Click="Button_Click"/>
</StackPanel>
</ScrollViewer>
</TabItem>
<TabItem Header="Second Tab">
<StackPanel>
<TextBlock Name="lbl1" Text="{Binding CurrentUser, UpdateSourceTrigger=PropertyChanged}"/>
<Button Content="Previous"
HorizontalAlignment="Left"
Margin="10,10,0,0"
VerticalAlignment="Top"
Width="75"
Click="Button_Click1"/>
</StackPanel>
</TabItem>
</TabControl>
</Window>
答案 0 :(得分：1)
您缺少从ObservableCollection继承Users。所以，WPF引擎不知道如何从这个类中获取数据。
更新
@ user3033921：您从ObservableObject继承了它而不是ObservableCollection。所以，问题是如果你想要从列表中识别这个类，那么你必须得到ICollection对象继承的那个类，如果你希望这个类是可观察的，它应该实现ICollection和INotifyPropertyChange。所以，对于@ BradleyDotNet来说，如果你没有任何特定的理由来创建自己的类型，那么只需创建一个ObservableCollection类型的用户对象。如果您特别需要具有类型的用户，则可以从ObserableCollection中将其作为推荐的解决方案派生。但请记住，您不希望在Users类中拥有List，因为您的类现在本身就是一个列表。因此，如果你有像GetByID这样的具体实现，那么这个类看起来像：
public class Users :ObservableCollection<User>
{
public User GetById(int id)
{
return this.First(u => u.ID == id);
}
}