c# 简单日志记录 txt

enum logtype {
ERROR,
WARMING,
INFO,
SUCCESS
}
private void log(string log,logtype type)
{
string str = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + " " + type.ToString()+" ";
if (!File.Exists("log.txt"))
{
FileStream fs1 = new FileStream("log.txt", FileMode.Create, FileAccess.Write);//创建写入文件
StreamWriter sw = new StreamWriter(fs1);
sw.WriteLine(str+log + "\r\n");//开始写入值
sw.Close();
fs1.Close();
}
else
{
StreamWriter sw2 = File.AppendText("log.txt");
string w = str+log + "\r\n";
sw2.Write(w);
sw2.Close();
}
}