c# - WPF - MVVM 绑定(bind)

Question

我的应用程序有问题，尤其是 WPF MVVM 中的绑定(bind)。我创建了模型、 View 模型和 View ，这是我的代码的一部分(只有这与我的问题有关)当我单击 nemed 按钮时:PointUp 我想查看 Team1 点数。谁能告诉我我做错了什么？

查看

    <Window x:Class="Tabu.Game
        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:Tabu"
        xmlns:vm="clr-namespace:Tabu.ViewModel"
        mc:Ignorable="d"
        Title="Game"  Height="600" Width="900" Background="Beige">
    <Window.DataContext>
        <vm:TeamStatistic />
    </Window.DataContext>
    <Grid>
        <Button x:Name="PointUp" Command="{Binding AddPoints }" Content="+"/>
        <Label x:Name="PointsTeam1_label" Content="{Binding Team1.TeamPoints, UpdateSourceTrigger=PropertyChanged }"/>
</Grid>

模型

'

namespace Tabu.Model
{
    public class Team
    {
        public bool IsTeamActive { get;  set; }
        public int TeamMiss { get;  set; }
        public int TeamPoints { get;  set; }
        public int TeamMistake { get;  set; }
    }
}

'

View 模型

namespace Tabu.ViewModel
{
    class TeamStatistic : INotifyPropertyChanged

    {
        public Team Team1 = new Team();

        public int TeamPoints
        {
            get { return TeamPoints; }
            set { TeamPoints = value; OnPropertyChanged("TeamPoints"); }
        }

        public ICommand AddPoints
        {
            get { return new RelayCommand(() => Add_Points()); }
        }

        public void Add_Points()
        {
            Team1.TeamPoints++;
        }

        public event PropertyChangedEventHandler PropertyChanged;

        private void OnPropertyChanged(params string[] propsName)
        {
            if (PropertyChanged!=null)
            {
                foreach(string propName in propsName)
                PropertyChanged(this, new PropertyChangedEventArgs(propName));
            }
        }
    }

public class RelayCommand : ICommand
    {
        private readonly Func<bool> canExecute;
        private readonly Action execute;

        public RelayCommand(Action execute)
            : this(execute, null) { }

        public RelayCommand(Action execute, Func<bool> canExecute)
        {
            if (execute == null) throw new ArgumentNullException("execute");
            this.execute = execute;
            this.canExecute = canExecute;
        }

        public event EventHandler CanExecuteChanged
        {
            add { if (this.canExecute != null) CommandManager.RequerySuggested += value; }
            remove { if (this.canExecute != null) CommandManager.RequerySuggested -= value; }
        }

        public Boolean CanExecute(object parameter) { return this.canExecute == null ? true : this.canExecute(); }
        public void Execute(object parameter) { this.execute(); }
    }
}

Answer 1

问题出在这里:

public int TeamPoints
{
    get { return TeamPoints; } //should be Team1.TeamPoints
    set { TeamPoints = value; OnPropertyChanged("TeamPoints"); } //should be Team1.TeamPoints
}

在 ViewModel 的 TeamPoints 属性中，您从 ViewModel 返回并设置相同的属性 TeamPoints 但您应该从 Model(Team1)设置。您应该返回并设置 Team1.TeamPoints。

public int TeamPoints
{
    get { return Team1.TeamPoints; }  
    set { Team1.TeamPoints = value; OnPropertyChanged("TeamPoints"); }
}

和Add_Points():

public void Add_Points()
{
    Team1.TeamPoints++;
    OnPropertyChanged("TeamPoints");
}