winform开启线程实时输出日志到控件

1、声明委托

  public delegate void ShowMessage2Form(string message);

2、声明事件

static public event ShowMessage2Form ShowMessage;

3、事件绑定

LogHelper.ShowMessage += ShowLog;

4、方法实现：实时显示到主窗口控件上

 private void ShowLog(string message)
        {
            try
            {
                if (txtLog2Display.InvokeRequired)
                {
                    txtLog2Display.BeginInvoke(new MethodInvoker(delegate
                    {
                        txtLog2Display.AppendText(message + "\r\n");
                    }));
                }
                else
                {
                    txtLog2Display.AppendText(message + "\r\n");

                }
            }
            catch (Exception error)
            {
                LogHelper.Log(NLog.LogLevel.Error, this.GetType().FullName, System.Reflection.MethodBase.GetCurrentMethod().Name, error.ToString());
            }
        }

5、保存日志文件

第一种方法：采用第三方日志控件

 NLogUtil.WriteFileLog(error_level, LogType.Form, function_name, log2write);

第二种方法：开启线程，将日志放置队列中，从队列中读取保存在文件中 不推荐，会阻塞主线程

using System;
using System.Collections.Concurrent;
using System.IO;
using System.Threading;

/// <summary>
/// 问题1：分类错误信号，并输出到界面控制台
/// </summary>
namespace Sunny.Net.Log
{
    public static class LogHelper
    {
        private static string log_path = "";
        private static ConcurrentQueue<string> logdata = new ConcurrentQueue<string>();
        private static Thread logthread;
        public delegate void ShowMessage2Form(string message);
        static public event ShowMessage2Form ShowMessage;
        static public event ShowMessage2Form ShowMessage2;

        static private StreamWriter logwriter;
        public static void StartLogSave()
        {
            string folderpath = string.Format("{0}{1}", System.Environment.CurrentDirectory, @"\Log");//组合得到文件存储路径
            if (System.IO.Directory.Exists(folderpath) == false)//判断路径是否存在，若否，则创建
            {
                Directory.CreateDirectory(folderpath);
            }
            log_path = string.Format("{0}{1}{2}{3}", folderpath, @"\", DateTime.Now.ToString("MM_dd_HH_mm"), ".txt");//创建LOG文件
            logwriter = new StreamWriter(log_path, true);
            logthread = new Thread(SaveLogThread);
            logthread.Start();
        }
        public static void StopLogSave()
        {
            while (!logdata.IsEmpty) continue;
            logthread.Abort();
            logwriter.Close();
            logwriter.Dispose();
        }
        public static void Log(string error_level, string layer, string function_name, string log2write)
        {
            try
            {
                if (logthread == null) StartLogSave();
                //else logthread.Resume();
                //else if (logthread.ThreadState != ThreadState.Running) logthread.Start();
                //if (logthread.ThreadState != ThreadState.Running) StartLogSave();
                //DeBug模式，其他模式需根据error_level进行改变输出,界面输出与文件输出需隔开
                string queuelog = string.Format("[{0}][{1}]::{2}.{3}:{4}", DateTime.Now.ToString("MM/dd HH:mm:ss:fff"), error_level, layer, function_name, log2write);
                logdata.Enqueue(queuelog);
                if (error_level == "INFO" && error_level != null)
                    ShowMessage(string.Format("[{0}]:{1}:{2}", DateTime.Now.ToString("HH:mm:ss:fff"), function_name, log2write));
                if (error_level == "INFO2" && error_level != null)
                    ShowMessage2(string.Format("[{0}]:{1}:{2}", DateTime.Now.ToString("HH:mm:ss:fff"), function_name, log2write));
            }
            catch (Exception e)
            {
                // MessageBox.Show("LOG写入队列失败：" + e.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
        private static void SaveLogThread()
        {
            try
            {
                string logmessage = null;
                for (; ; )
                {
                    if (logdata.Count > 0)
                    {
                        logdata.TryDequeue(out logmessage);
                        if (logmessage != null) logwriter.WriteLine(logmessage);
                        logwriter.Flush();
                    }
                }
            }
            catch (Exception e)
            {
                throw e;
               // MessageBox.Show("LOG写入文件失败：" + e.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
    }
}