EventHandlerの使い方

【発行側】
public class class1
{
   public delegate void _MyEvent(object sender, MyEventArgs e);
   public event _MyEvent MyEvent;
   protected virtual void MyChangeEvent(MyEventArgs e)
   {
      if ( MyEvent != null )
      {
         MyEvent( this, e );
      }
   }
   private void Changed()
   {
      MyEventArgs e = new MyEventArgs( arg1, arg2 );
      MyChangeEvent(e);
   }
   public class MyEventArgs : EventArgs
   {
      public string Arg1;
      public int Arg2;
      ...
      public MyEventArgs (  string _Arg1, int _Arg2 )
      {
         Arg1 = _Arg1;
         Arg2 = _Arg2;
      }
   }
}
【受取側】
public class class2
{
   private void Define()
   {
      class1 obj = new class1();
      obj.MyEvent += new class1._MyEvent(RecieveEvent);
    }
   private void RecieveEvent( object sender, class1.MyEventArgs e)
   {
      Console.WriteLine(e.Arg1 + e.Arg2);
   }
}

Wpf細かい書式

毎回忘れる細かい書式

・.Resource内での宣言
<.Resource>
     <DataTemplate DataType="{x:Type [namespace]:[class]}" />
</.Resource>

・ListBoxへのBinding
要素が1つなら
 <ListBox ItemsSource="{Binding [List]}" DisplayMemberPath="[Listの要素]"/>

要素が複数かつ色々変えるなら
<ListBox ItemsSource="{Binding [List]}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <StackPanel>
                <TextBlock Text="{Binding [要素1]}"/>
                <TextBlock Text="{Binding [要素2]}"/>         
            </StackPanel>
         </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

選択できなくて良いなら
<ItemsControl ItemsSource="{Binding [List]}">
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <Border Background="LightPink" CornerRadius="20">
                <TextBlock Margin="1">
                                <!--Run Text="要素1 : " FontSize="10"/-->
                                <Run Text="{Binding [要素1]}" FontSize="10"/>
                                <LineBreak/>
                                <Run Text="要素2 : "/>
                                <Run Text="{Binding [要素2]}"/>
                </TextBlock>
            </Border>
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>

・PropertyChangedの通知
public event PropertyChangedEventHandler PropertyChanged;

 private void NotifyPropertyChanged(string info)
 {
     if (PropertyChanged != null)
     {
         PropertyChanged(this, new PropertyChangedEventArgs(info));
     }
 }

PasswordBoxでデータバインド

【参考】http://garafu.blogspot.jp/2014/09/wcf-passwordbox.html
セキュリティの問題から基本的には非推奨
-----------------------

利用方法
<PasswordBox [namespace]:PasswordBoxHelper.Password = {Binding Target}/>


------------------------
【PasswordBoxHelper.cs】

namespace WpfPasswordBox

{

    using System.Windows;

    using System.Windows.Controls;

    public class PasswordBoxHelper : DependencyObject

    {

        public static readonly DependencyProperty IsAttachedProperty = DependencyProperty.RegisterAttached(

            "IsAttached",

            typeof(bool),

            typeof(PasswordBoxHelper),

            new FrameworkPropertyMetadata(false, PasswordBoxHelper.IsAttachedProperty_Changed));

        public static readonly DependencyProperty PasswordProperty = DependencyProperty.RegisterAttached(

            "Password",

            typeof(string),

            typeof(PasswordBoxHelper),

            new FrameworkPropertyMetadata(string.Empty, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, PasswordBoxHelper.PasswordProperty_Changed));

        public static bool GetIsAttached(DependencyObject dp)

        {

            return (bool)dp.GetValue(PasswordBoxHelper.IsAttachedProperty);

        }

        public static string GetPassword(DependencyObject dp)

        {

            return (string)dp.GetValue(PasswordBoxHelper.PasswordProperty);

        }

        public static void SetIsAttached(DependencyObject dp, bool value)

        {

            dp.SetValue(PasswordBoxHelper.IsAttachedProperty, value);

        }

        public static void SetPassword(DependencyObject dp, string value)

        {

            dp.SetValue(PasswordBoxHelper.PasswordProperty, value);

        }

        private static void IsAttachedProperty_Changed(DependencyObject sender, DependencyPropertyChangedEventArgs e)

        {

            var passwordBox = sender as PasswordBox;

            if ((bool)e.OldValue)

            {

                passwordBox.PasswordChanged -= PasswordBoxHelper.PasswordBox_PasswordChanged;

            }

            if ((bool)e.NewValue)

            {

                passwordBox.PasswordChanged += PasswordBoxHelper.PasswordBox_PasswordChanged;

            }

        }

        private static void PasswordBox_PasswordChanged(object sender, RoutedEventArgs e)

        {

            var passwordBox = sender as PasswordBox;

            PasswordBoxHelper.SetPassword(passwordBox, passwordBox.Password);

        }

        private static void PasswordProperty_Changed(DependencyObject sender, DependencyPropertyChangedEventArgs e)

        {

            var passwordBox = sender as PasswordBox;

            var newPassword = (string)e.NewValue;

            if (!GetIsAttached(passwordBox))

            {

                SetIsAttached(passwordBox, true);

            }

            if ((string.IsNullOrEmpty(passwordBox.Password) && string.IsNullOrEmpty(newPassword)) ||

                passwordBox.Password == newPassword)

            {

                return;

            }

            passwordBox.PasswordChanged -= PasswordBoxHelper.PasswordBox_PasswordChanged;

            passwordBox.Password = newPassword;

            passwordBox.PasswordChanged += PasswordBoxHelper.PasswordBox_PasswordChanged;

        }

    }

}