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using System;

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            FizzBuzz(4, 7, 120);
        }

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using System;

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            FizzBuzz();
        }

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protected override void OnClosing(CancelEventArgs e)
{
       base.OnClosing(e);

       // 何か処理追加
}

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public MainWindow()
{
     InitializeComponent();

     var mView = new ViewModel.MainViewModel();
     this.All.DataContext = mView;
     // OnClose時に処理を行いたいので、Model側で閉じられるようthis.CloseをVMに渡す。
     if(mView.Model.CloseAction == null)
           mView.Model.CloseAction = new Action(() => this.Close());
}

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// 閉じる処理プロパティ
public Action CloseAction { get; set; }

public void OnClosing()
{
     // 追加したい処理
     CloseAction();
}

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public ICommand Close { get; private set; }

public MainViewModel() 
{
     Close = new RelayCommand(_Model.OnClosing);
}

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<Button x:Name="CloseButton" Content="r" Style="{DynamicResource CaptionButtonStyleKey}" Command="{Binding Close}">

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publi class Person
{
    public string Name { get; set; }

    public string Age { get; set; }
}

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public void SaveXml(List<Person> personList)
{
    System.Xml.Serialization.XmlSerializer serializer = new System.Xml.Serialization.XmlSerializer(typeof(Person[])); 

    // Data.xmlは保存するファイル名

    using (System.IO.FileStream fs = new System.IO.FileStream("Data.xml", System.IO.FileMode.Create)) 
    {
        serializer.Serialize(fs, personList.ToArray());
    }

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public List<Person> LoadXml() 
{
    Person[] loadAry;

    System.Xml.Serialization.XmlSerializer serializer = new System.Xml.Serialization.XmlSerializer(typeof(Person[]));

    using (System.IO.StreamReader sr = new System.IO.StreamReader("Data.xml", new System.Text.UTF8Encoding(false)))
    {
        loadAry = (Person[])serializer.Deserialize(sr);
    }