我的應用程序有問題,特別是WPF MVVM中的綁定。 我創建了模型,視圖模型和視圖,這是我的代碼的一部分(只有這與我的問題有關)當我點擊按鈕nemed:PointUp我想看看Team1點的數量。任何人都可以告訴我我做錯了什麼?WPF - MVVM綁定
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>
型號
'
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; }
}
}
'
視圖模型
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(); }
}
}
是的它的真實,我的錯誤:)它的工作原理,但只在開始時,點的數量仍然是相同的0。綁定不會刷新 – Arkady
啊,好吧,我看到了問題。 您在AddTeamPoints方法中更新Team1.Teampoints,NotifyPropertyChanged將不會再次觸發。 當你寫OnPropertyChanged(「TeamPoints」);在Team1.TeamPoints ++之後;它會沒事的。 –
謝謝!我沒有注意到。 – Arkady