ce63f9bff9
- Voeg RelayCommand class toe voor herbruikbare ICommand implementatie - Vervang button click event handler door AddProductCommand in MainViewModel - Update XAML om Command binding te gebruiken in plaats van Click event - Verwijder business logic uit code-behind (MainWindow.xaml.cs) - Los DataContext duplicatie op (was twee keer MainViewModel instantie) Dit maakt de applicatie beter testbaar en volgt proper MVVM principes. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
63 lines
2.3 KiB
C#
63 lines
2.3 KiB
C#
using System;
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using System.Windows.Input;
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namespace MVVM_DEMO.Commands
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{
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/// <summary>
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/// A command whose sole purpose is to relay its functionality to other objects by invoking delegates.
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/// The default return value for the CanExecute method is 'true'.
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/// </summary>
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public class RelayCommand : ICommand
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{
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private readonly Action<object?> _execute;
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private readonly Func<object?, bool>? _canExecute;
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/// <summary>
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/// Occurs when changes occur that affect whether or not the command should execute.
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/// </summary>
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public event EventHandler? CanExecuteChanged
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{
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add { CommandManager.RequerySuggested += value; }
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remove { CommandManager.RequerySuggested -= value; }
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}
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/// <summary>
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/// Creates a new command that can always execute.
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/// </summary>
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/// <param name="execute">The execution logic.</param>
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public RelayCommand(Action<object?> execute) : this(execute, null)
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{
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}
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/// <summary>
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/// Creates a new command.
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/// </summary>
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/// <param name="execute">The execution logic.</param>
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/// <param name="canExecute">The execution status logic.</param>
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public RelayCommand(Action<object?> execute, Func<object?, bool>? canExecute)
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{
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_execute = execute ?? throw new ArgumentNullException(nameof(execute));
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_canExecute = canExecute;
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}
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/// <summary>
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/// Determines whether this command can execute in its current state.
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/// </summary>
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/// <param name="parameter">Data used by the command. If the command does not require data to be passed, this object can be set to null.</param>
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/// <returns>true if this command can be executed; otherwise, false.</returns>
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public bool CanExecute(object? parameter)
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{
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return _canExecute == null || _canExecute(parameter);
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}
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/// <summary>
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/// Executes the command.
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/// </summary>
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/// <param name="parameter">Data used by the command. If the command does not require data to be passed, this object can be set to null.</param>
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public void Execute(object? parameter)
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{
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_execute(parameter);
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}
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}
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}
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