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请问这个WPF的MVVM哪里出错了?跑不出来结果啊。

0
悬赏园豆:10 [已关闭问题] 关闭于 2016-09-25 18:46
<Window x:Class="MVVM.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:MVVM"
        mc:Ignorable="d"
        Title="MainWindow" Height="500" Width="800">
    <Window.Resources>
        <Style x:Key="stackStyle" TargetType="StackPanel">
            <Style.Triggers>
                <DataTrigger Binding="{Binding Path=Age}" Value="0">
                    <Setter Property="Background" Value="Yellow"></Setter>
                </DataTrigger>
            </Style.Triggers>
        </Style>
        <DataTemplate x:Key="personTemplete">
            <StackPanel Margin="2" Orientation="Horizontal" Style="{StaticResource stackStyle}">
                <TextBlock Text="{Binding Name}" Width="50"></TextBlock>
                <TextBlock Text="{Binding Age}"></TextBlock>
            </StackPanel>
        </DataTemplate>
    </Window.Resources>
    <Grid>
        <ListView x:Name="listView" Margin="60" ItemsSource="{Binding PersonList}" ItemTemplate="{StaticResource personTemplete}"></ListView>
        <Button Height="25" Width="75" Command="{Binding AddRowCommand}" HorizontalAlignment="Left" Margin="10,0,10,10" VerticalAlignment="Bottom" Content="加一行"></Button>
    </Grid>
</Window>

这是后台.cs代码:

 public partial class MainWindow : Window
    {

        public MainWindow()
        {
            InitializeComponent();

            this.DataContext = new MainWindowViewModel();
        }
    }

ViewModelBase类:

 public class ViewModelBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        //当属性改变的时候,调用该方法来发起一个消息,通知View中绑定了propertyName的元素做出调整
        public void RaisePropertyChanged(string propertyName)
        {
            if (this.PropertyChanged != null)
            {
                this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }

MainWindowViewModel:

 public class MainWindowViewModel :ViewModelBase
    {
        public ObservableCollection<Person> PersonList = new ObservableCollection<Person>();

        //public Person Person = new Person { Name = "test", Age = 31 };

        public MainWindowViewModel()
        {
            this.PersonList.Add(new MVVM.Person { Name = "trent", Age = 44 });
            this.PersonList.Add(new MVVM.Person { Name = "kurt", Age = 23 });
            this.PersonList.Add(new MVVM.Person { Name = "denny", Age = 30 });
        }


        private ICommand addRowCommand;
        public ICommand AddRowCommand
        {
            get
            {
                if (this.addRowCommand == null)
                    this.addRowCommand = new DelegateCommand(x => this.AddRow());

                return this.addRowCommand;
            }
        }

        private void AddRow()
        {
            this.PersonList.Add(new MVVM.Person { Name = "eysa", Age = 31 });
        }
    }

DelegateCommand类:

 public class DelegateCommand : ICommand
    {
        readonly Action<object> _execute;
        readonly Predicate<object> _canExecute;

        public DelegateCommand(Action<object> execute) : this(execute, null)
        {
        }

        public DelegateCommand(Action<object> execute, Predicate<object> canExecute)
        {
            if (execute == null)
                throw new ArgumentNullException("execute");
            _execute = execute;
            _canExecute = canExecute;
        }

        public void Execute(object parameter)
        {
            _execute(parameter);
        }

        public bool CanExecute(object parameter)
        {
            return _canExecute == null ? true : _canExecute(parameter);
        }

        public event EventHandler CanExecuteChanged
        {
            add { CommandManager.RequerySuggested += value; }
            remove { CommandManager.RequerySuggested -= value; }
        }
    }

我看别人博客里写的就是这样的,但是我为什么跑起来没绑定上PersonList呢?

Eysa的主页 Eysa | 初学一级 | 园豆:68
提问于:2016-09-24 22:17
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所有回答(2)
0

问题出在PersonList不是属性,只是一个字段。

Eysa | 园豆:68 (初学一级) | 2016-09-25 18:46
0

数据源和你绑定的不在同一级别

东秦男人 | 园豆:238 (菜鸟二级) | 2016-11-29 11:22
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