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Posted 4 May 2010

Presentation Model (MVVM) Good Practices

, 11 May 2010
Showing some good practices that can be applied to the Presentation Model/MVVM pattern.
App.Configuration
App.Configuration.Wpf
Interceptors
Properties
Wpf
Properties
Wpf
App.Core
Model
PresentationModel
Properties
Services
App.Data
Properties
libs
AttachedCommandBehavior.dll
Castle.Core.dll
Castle.DynamicProxy2.dll
Castle.MicroKernel.dll
Castle.Windsor.dll
PresentationModelBase
Properties
WPFUI
Properties
View
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Input;
using PresentationModelBase;
using System.Reflection;

namespace App.Configuration
{
    class MethodCallCommand : ICommand
    {
        public MethodCallCommand(PresentationModel target) 
        {
            _target = target;
        }

        PresentationModel _target;

        #region ICommand Members

        public bool CanExecute(object parameter)
        {
            return true;
        }

        public event EventHandler CanExecuteChanged;

        public void Execute(object parameter)
        {
            MethodInfo currentMethod = _target.GetType().GetMethod(parameter.ToString(), BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
            if (currentMethod == null)
                throw new ArgumentException("Cannot find this method");

            ParameterInfo[] parameters = currentMethod.GetParameters();
            if (parameters != null && parameters.Length > 0)
                throw new ArgumentException("Methods called by this command must have no parameters");

            Type returnType = currentMethod.ReturnType;
            if (returnType != typeof(void))
                throw new ArgumentException("Methods called by this command must return void");

            _target.InvokeMethod(currentMethod);
        }

        protected virtual void Execute(MethodInfo mi) 
        {
            mi.Invoke(_target, null);
        }

        #endregion
    }
}

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