例外キャッチした時にログファイル出力する

ExceptionLogWriter

using System;
using System.Configuration;
using System.IO;
using System.Text;

namespace LogFilerSample
{
	class Program
	{
		private static readonly string _filePath = ConfigurationManager.AppSettings["LogFilePath"];

		private static readonly Encoding _encode = Encoding.GetEncoding("UTF-8");


		static void Main(string[] args)
		{
			try
			{
				Program.Func();
			}
			catch (Exception ex)
			{
				Write(ex);
				Console.WriteLine("Log file output.");
				Console.ReadKey();
			}
		}

		private static void Write(Exception ex)
		{
			var sb = new StringBuilder();

			sb.Length = 0;
			sb.AppendFormat("発生時刻:{0}\n", DateTime.Now);
			sb.AppendFormat("発生箇所:{0}\n", ex.TargetSite);
			sb.AppendFormat("例外ﾀｲﾌﾟ:{0}\n", ex.GetType().Name);
			sb.AppendFormat("内容　　:{0}\n", ex.Message);
			sb.AppendLine("スタックトレース");
			sb.AppendLine(ex.StackTrace);

			string path = Path.Combine(Program._filePath + DateTime.Now.ToString("yyyyMMdd") + "ExceptionLog.log");

			using (var stream = new StreamWriter(path, true, Program._encode))
			{
				try
				{
					stream.Write(sb.ToString());
				}
				finally
				{
					stream.Close();
				}
			}
			
		}

		private static void Func()
		{
			throw new NotImplementedException();
		}
	}
}