Asp.net讀取和寫入txt文件方法

        string strfile= "asp.txt";
        
        string strout=string.Empty;
        if (!File.Exists(System.Web.HttpContext.Current.Server.MapPath(strfile)))
        {
        }
        else
        {
            using(StreamReader sr = new StreamReader(System.Web.HttpContext.Current.Server.MapPath(strfile), System.Text.Encoding.Default))
            {
               strout= sr.ReadToEnd();
           }
            
        }

        Response.Write("ssss");

// =============================== 【txt文檔比較小，內容很少的時候的一種寫法】
        using system.test;
        string txt = File.ReadAllText("d:\\aaa.sys", Encoding.Default);
        Response.Write("【" + txt + "】");

System.IO.File.WriteAllText("e:\\asp_1.txt", "I LOVE YOU!wang na");  // 一定要絕對路徑

string txtPath = Server.MapPath("~\\Public\\AttInfo\\") + "Test.txt"; 
StreamWriter sw = new StreamWriter(txtPath, false, System.Text.Encoding.Default); 
sw.WriteLine("Hello World"); 
sw.WriteLine(""); //輸出空行 
sw.WriteLine("ASP.NET網絡編程！"); 
sw.Close();