c# 写文件操作

写文本到指定文件：

                    var fs = new FileStream(filePath, FileMode.Create);
                    StreamWriter sw = new StreamWriter(fs);
                    sw.WriteLine("hello text");
                    sw.Flush();
                    sw.Close();
                    fs.Close();

读取文件

            StreamReader sr = new StreamReader(file, Encoding.Default);
            string urlText = sr.ReadLine();
            sr.Close();