IMPLÉMENTER FACILEMENT INOTIFYPROPERTYCHANGED

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;
using PostSharp.Laos;
using System.Text.RegularExpressions;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Test t = new Test();
            t.PropertyChanged += new PropertyChangedEventHandler((s, e) =>
            {
                Console.WriteLine(string.Format("{0} has changed", e.PropertyName));
            });

            t.Prop1 = "a value";
            t.Prop2 = "a value";
            t.Prop3 = "a value";
        }
    }

    [NotifyPropertyChanged]
    public class Test : INotifyPropertyChanged
    {
        public string Prop1 { get; set; }
        
        public string Prop2;

        private string _Prop3;

        public string Prop3
        {
            get { return _Prop3; }
            set { _Prop3 = value; }
        }

        #region INotifyPropertyChanged Members

        public event PropertyChangedEventHandler PropertyChanged;

        #endregion
    }

    [Serializable]
    public class NotifyPropertyChanged : OnFieldAccessAspect
    {
        public override void OnSetValue(FieldAccessEventArgs eventArgs)
        {
            base.OnSetValue(eventArgs);
            
            var owner = eventArgs.Instance;

            string propertyName = string.Empty;
            string fieldName = eventArgs.FieldInfo.Name;
            Regex reg = new Regex(@"(<)(\w*?)(>k__BackingField)");
            Match match = reg.Match(fieldName);
            if (match.Success)
                propertyName = match.Groups[2].Value;
            else if(fieldName.StartsWith("~"))
                propertyName = fieldName.Replace("~", string.Empty);
            else if(fieldName.StartsWith("_"))
                propertyName = fieldName.Replace("_", string.Empty);

            var e = new PropertyChangedEventArgs(propertyName);

            FireEvent(owner, "PropertyChanged", e); 
        }

        //http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=776014&SiteID=1
        public void FireEvent(object owner, string name, EventArgs e)
        {
            MulticastDelegate eventDelagate =
                  (MulticastDelegate)owner.GetType().GetField(name,
                   System.Reflection.BindingFlags.Instance |
                   System.Reflection.BindingFlags.NonPublic).GetValue(owner);

            if (eventDelagate != null)
            {
                Delegate[] delegates = eventDelagate.GetInvocationList();

                foreach (Delegate dlg in delegates)
                    dlg.Method.Invoke(dlg.Target, new object[] { owner, e });
            }
        }    
    }
}

Télécharger le zip

09 octobre 2007 14:42:14 :

ajout d'une conclusion.

09 octobre 2007 20:52:07 :

précisions sur le type de projet et la spécification utilisée.

10 octobre 2007 12:36:21 :

correction code