Question

我在修改包含UserControl集合的ListBox时遇到问题。我想更新一个特定的UserControl项，但是当绑定类发生更改时它没有被更新。

班级代码：

private ObservableCollection<User> _UserList;
    public ObservableCollection<User> UserList
    {
        get
        {
            return _UserList;

        }
        set
        {
            _UserList = value;
            NotifyPropertyChanged();
        }
    }
    public void EditUser()
    {           
        User wat = UserList.FirstOrDefault(ul => ul.Handle == "JaviSRK");
        wat.Color = "Red";
        NotifyPropertyChanged("UserList");
    }

XAML：

<ListBox Margin="10,0,0,0" Name="lstLocalUsers" Height="510" Width="225"
  HorizontalAlignment="Left" ItemsSource="{Binding UserList}" SelectionMode="Multiple">
<ListBox.ItemTemplate>
    <DataTemplate>
        <StackPanel Orientation="Vertical">             
            <tplayer:UserControl />
        </StackPanel>
    </DataTemplate>
</ListBox.ItemTemplate>

UserControl XAML：

<Grid>
    <StackPanel Orientation="Vertical" >
        <StackPanel Orientation="Horizontal">
            <TextBlock Foreground="{Binding Color}" Name="txtLastName" Text="{Binding LastName}" FontWeight="Bold" />
            <TextBlock Foreground="{Binding Color}" Text=", " />
            <TextBlock Foreground="{Binding Color}" Name="txtFirstName" Text="{Binding FirstName}" FontWeight="Bold" />
            <TextBlock Foreground="{Binding Color}" Name="txtHandle" Text="{Binding Handle, StringFormat=({0})}" FontWeight="Bold" Margin="5,0,0,0" />
        </StackPanel>

        <StackPanel Orientation="Horizontal">
            <TextBlock Foreground="{Binding Color}" Name="txtCity" Text="{Binding City}" />
            <TextBlock Foreground="{Binding Color}" Text=", " />
            <TextBlock Foreground="{Binding Color}" Name="txtState" Text="{Binding State}" />
        </StackPanel>
    </StackPanel>
</Grid>

UserList集合正确更新，但UserControl本身没有。我该怎么做？

Answer 1

事实证明，User类本身需要实现INotifyPropertyChanged接口。

public class User : INotifyPropertyChanged
{       
    public string _Color;
    public string Color
    {
        get
        {
            return _Color;
        }
        set
        {
            _Color = value;
            NotifyPropertyChanged();
        }
    }        
}

WPF：如何在ListBox中更新UserControl

1 个答案: