csc.exe lang_06.cs

using System;
using System.IO;

// ********************************************************
// * 実行
// ********************************************************
public class App
{

	public static void Main() {

		// PATH 環境変数取得
		String strEnv = Environment.GetEnvironmentVariable( "PATH" );

		// 配列定義
		String delimStr = ";";
		Char[] delimiter = delimStr.ToCharArray();

		String[] split = null;

		// トークン分割
		split = strEnv.Split( delimiter );

		// ソート
		Array.Sort( split, split.GetLowerBound(0), split.Length );

		// 書き込み
		try {
			StreamWriter OutFile = new StreamWriter( @".\result.txt", false );
			foreach (String strValue in split) {
				OutFile.WriteLine( strValue );
			}
			OutFile.Flush();
			OutFile.Close();
	
		}
		catch( Exception e ) {
			Console.WriteLine("エラーの内容 : {0}", e.ToString());
		}
	}

}