C#写日志

public void WriteLog(string context)

        {

            if (!string.IsNullOrEmpty(logFilePath))

            {

                FileStream fileStream = null;

                if (File.Exists(logFilePath))

                {

                    fileStream = new FileStream(logFilePath, FileMode.Append, FileAccess.Write);

                }

                else

                {

                    Directory.CreateDirectory(logFilePath.Substring(0, logFilePath.LastIndexOf("\\")));

                    fileStream = new FileStream(logFilePath, FileMode.Create, FileAccess.Write);

                }

 

                StreamWriter writer = new StreamWriter(fileStream);

                try

                {

                    FileInfo fi = new FileInfo(logFilePath);

                    string fileName;

                    if (fi.Length >= 1024 * 1024 * 5)

                    {

                        fileName = fi.FullName.Substring(0, fi.FullName.Length - 4) + "." + DateTime.Now.ToString("yyyyMMddHHmmss") + Path.GetExtension(logFilePath);

                        writer.Close();

                        if (!File.Exists(fileName))

                        {

                            File.Move(logFilePath, fileName);

                            writer = File.CreateText(logFilePath);

                        }

                        else

                            writer = File.AppendText(logFilePath);

                    }

                    writer.WriteLine(string.Empty.PadLeft(20, '=') + DateTime.Now.ToString() + string.Empty.PadLeft(20, '='));

                    writer.WriteLine(context);

                    writer.Flush();

                    writer.Close();

                }

                finally

                {

                    fileStream.Close();

                    writer.Close();

                }

 

            }

        }