【C#写日志两个简单方法】

方法一：以日期为日志文件名.

public void WriteLog(string msg)  
{  
    string filePath = AppDomain.CurrentDomain.BaseDirectory + "Log";  
    if (!Directory.Exists(filePath))  
    {  
        Directory.CreateDirectory(filePath);  
    }  
    string logPath = AppDomain.CurrentDomain.BaseDirectory + "Log\\" + DateTime.Now.ToString("yyyy-MM-dd") + ".txt";  
    try  
    {  
        using (StreamWriter sw = File.AppendText(logPath))  
        {  
            sw.WriteLine("消息：" + msg);  
            sw.WriteLine("时间：" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));  
            sw.WriteLine("**************************************************");  
            sw.WriteLine();  
            sw.Flush();  
            sw.Close();  
            sw.Dispose();  
        }  
    }  
    catch (IOException e)  
    {  
        using (StreamWriter sw = File.AppendText(logPath))  
        {  
            sw.WriteLine("异常：" + e.Message);  
            sw.WriteLine("时间：" + DateTime.Now.ToString("yyy-MM-dd HH:mm:ss"));  
            sw.WriteLine("**************************************************");  
            sw.WriteLine();  
            sw.Flush();  
            sw.Close();  
            sw.Dispose();  
        }  
    }  
}  

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