C# -- 多线程向同一文件写入

1. 多线程向同一文件写入log.

public delegate void asynclog(string str1, string str2);

private void test()
{
    console.writeline("test start...");

    for (int i = 0; i < 100; i++)
    {
        asynclog asylog1 = new asynclog(writelog);
        asylog1.begininvoke("eventactiona" + i.tostring(), "eventcontenta" + i.tostring(), null, null);

        asynclog asylog2 = new asynclog(writelog);
        asylog2.begininvoke("eventactionb" + i.tostring(), "eventcontentb" + i.tostring(), null, null);

        asynclog asylog3 = new asynclog(writelog);
        asylog3.begininvoke("eventactionc" + i.tostring(), "eventcontentc" + i.tostring(), null, null);
    }

    console.writeline("test end...");
}

public static object lockobject = new object();

private void writelog(string streventtype, string streventcontent)
{
    lock (lockobject)
    {
        console.writeline("write log start... threadid:{0}", thread.currentthread.managedthreadid);

        string strlogpath = string.format("d:\\log\\log{0}.log", datetime.now.tostring("yyyy-mm-dd"));

        if (!file.exists(strlogpath))
        {
            file.create(strlogpath).close();
        }

        filestream fs = new filestream(strlogpath, filemode.append, fileaccess.write);
        streamwriter sw = new streamwriter(fs, encoding.utf8);

        sw.writeline(string.format("{0}  {1}", streventtype, streventcontent));

        sw.close();
        fs.close();

        console.writeline("write log end   threadid:{0}", thread.currentthread.managedthreadid);
    }
}