往txt写文件

Question

using(FileStream fs=File.Create(strpath)){};
using(FileStream fs=File.OpenWrite(strpath))
{
tf=pathout+strmodname+stryear+i.ToString()+".txt";//经过外协程序处理后的文件名称
StreamWriter sw=new StreamWriter(fs,System.Text.Encoding.GetEncoding("UTF-8"));
/*************************写文件********************/
sw.WriteLine("20380000 4360000 20535000 4490000");
sw.WriteLine("130 155");
sw.WriteLine(tf);
         sw.Close();
}这是写文件   也可以读文件 主要是你using system.io  里面有好多 自己看看

Answer 1

string spath = @"d:\Test.txt";
            if (File.Exists(spath))
            {
                using (StreamWriter sw = new StreamWriter(spath))
                {
                    sw.Write("ZZZ");
                    sw.Flush();
                    sw.Close();
                }
                
            }

Answer 2

//登录成功写入日志
            string FolderPath = Server.MapPath("/LoginLog/" + System.DateTime.Now.ToString("yyyy-MM"));
            if (!Directory.Exists(FolderPath))
            {
                //文件夹不存在则创建
                Directory.CreateDirectory(FolderPath);
                //写入日志
                string FilePath = Server.MapPath("/LoginLog/" + DateTime.Now.ToString("yyyy-MM") + "/" + DateTime.Now.ToString("yyyy-MM-dd"));
                if (!Directory.Exists(FilePath))
                {
                    //如果文件存在则写入日志
                    using (StreamWriter writer = File.AppendText(FilePath + ".txt"))
                    {
                        writer.WriteLine("[登录成功！][用户IP]：" + ip + "； [登录时间]：" + DateTime.Now);
                        writer.Flush();
                        writer.Close();
                    }
                }
                else
                {
                    //如果文件不存在当前目录下创建一个文本文件  
                    StreamWriter writer = new StreamWriter(FilePath + ".txt");                    writer.WriteLine("[登录成功！][用户IP]：" + ip + "； [登录时间]：" + DateTime.Now);
                    writer.Flush();
                    writer.Close();
                }
            }
            else
            {
                //文件夹存在则写入日志
                string FilePath = Server.MapPath("/LoginLog/" + DateTime.Now.ToString("yyyy-MM") + "/" + DateTime.Now.ToString("yyyy-MM-dd"));
                if (!Directory.Exists(FilePath))
                {
                    //如果文件存在则写入日志
                    using (StreamWriter writer = File.AppendText(FilePath + ".txt"))
                    {
                        writer.WriteLine("[登录成功！][用户IP]：" + ip + "； [登录时间]：" + DateTime.Now);
                        writer.Flush();
                        writer.Close();
                    }
                }
                else
                {
                    //如果文件不存在当前目录下创建一个文本文件  
                    StreamWriter writer = new StreamWriter(FilePath + ".txt");                    writer.WriteLine("[登录成功！][用户IP]：" + ip + "； [登录时间]：" + DateTime.Now);
                    writer.Flush();
                    writer.Close();
                }
            }

Answer 3

StreamWriter sw = new StreamWriter(@"c:\test.txt")
sw.WriteLine("test");
sw.flush;
sw.close;

Answer 4

最简单的
File.WriteAllBytes
File.WriteAllLines
File.WriteAllText