WPFMVVM实现ICommand与INotifyPropertyChanged接口

话不多说直接上代码

 

带参数 ICommand实现代码

 

 private readonly Action<T> _execute;
 private readonly Func<T, bool> _canExecute;

 public RelayCommand(Action<T> execute, Func<T, bool> canExecute = null)
 {
     _execute = execute ?? throw new ArgumentNullException(nameof(execute));
     _canExecute = canExecute;
 }

 public bool CanExecute(object parameter) => _canExecute == null || _canExecute((T)parameter);

 public void Execute(object parameter) => _execute((T)parameter);

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

 

不带参数 ICommand实现代码

public class Command : ICommand
{
public event EventHandler? CanExecuteChanged;

public bool CanExecute(object? parameter) => true;

public void Execute(object? parameter)
{
if (parameter is RoutedEventArgs e) 
{ e.Handled = true; // 阻止事件传播 
}
DoExecute?.Invoke(parameter);
}
public Action<object> DoExecute { get; set; }

public Command(Action<object> doExecute)
{
DoExecute = doExecute;
}
}

INotifyPropertyChanged实现代码

 

internal class NotifyBase : INotifyPropertyChanged
{
public event PropertyChangedEventHandler? PropertyChanged

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


remove
{
CommandManager.RequerySuggested -= value;
}
}

public void SetProperty<T>(ref T feild, T value, [CallerMemberName] string propName = "")
{
feild = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propName));
}

}