写日志的两个简单方法

方法一：以日期为日志文件名.

01.StreamWrite

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();  
        }  
    }  
}

02.泛型

/// <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();  
}