C#写日志两个简单方法

https://blog.csdn.net/hdhai9451/article/details/46455813

https://www.cnblogs.com/wyt007/p/8023391.html

在开发，有时为了验证程序运行是否正确，通常要写日志来记录操作，在一个日志类里，通常有两个方法：

 

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();
}
}
}

利用泛型进行打印日志

/// <summary>
/// 打印日志
/// </summary>
/// <param name="msg"></param>
public static 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();
}
}
}

/// <summary>
/// 打印Model日志
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="model"></param>
public static void WriteLog<T>(T model) where T:class
{
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))
{
Type type = typeof(T);
string msg = string.Join("*****", type.GetProperties().Select(m=>m.Name+":"+m.GetValue(model)));

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();
}
}
}

方法二：以文档名称和日期结合作为文件名

public void WriteLog(string documentName, string msg)
{
string errorLogFilePath = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Log");
if (!System.IO.Directory.Exists(errorLogFilePath))
{
System.IO.Directory.CreateDirectory(errorLogFilePath);
}
string logFile = System.IO.Path.Combine(errorLogFilePath, documentName + "@" + DateTime.Today.ToString("yyyy-MM-dd") + ".txt");
bool writeBaseInfo = System.IO.File.Exists(logFile);
StreamWriter swLogFile = new StreamWriter(logFile, true, Encoding.Unicode);
swLogFile.WriteLine(DateTime.Now.ToString("HH:mm:ss") + "\t" + msg);
swLogFile.Close();
swLogFile.Dispose();
}