.net读取写入文本操作

             

               string creatfile = Server.MapPath(@"~/datasource.xml");
                //写入之前清空文本内容
                System.IO.File.ReadAllText(creatfile, Encoding.GetEncoding("gb2312"));
                FileStream stream = System.IO.File.Create(creatfile);
                stream.Close();
                using (System.IO.StreamWriter tempsw = new System.IO.StreamWriter(creatfile, true, Encoding.GetEncoding("gb2312")))
                {
                    tempsw.WriteLine(strxml);//写入最新数据内容
                    tempsw.Flush();

                    tempsw.Close();
                }

其他操作整理：

c#创建文本

private const string FILE_NAME = "ErroLog.txt";
          public static void WriteFile(string str)
          ...{
              StreamWriter sr;          
              if (File.Exists(FILE_NAME)) //如果文件存在,则创建File.AppendText对象
              ...{
                  sr = File.AppendText(FILE_NAME);
              }
              else    //如果文件不存在,则创建File.CreateText对象
              ...{
                  sr = File.CreateText(FILE_NAME);
              }
              sr.WriteLine(str);
              sr.Close();
          }

C#追加文件
StreamWriter sw = File.AppendText(Server.MapPath(".")+"\\myText.txt");
sw.WriteLine("追逐理想");
sw.WriteLine("kzlll");
sw.WriteLine(".NET笔记");
sw.Flush();
sw.Close();

C#拷贝文件
string OrignFile,NewFile;
OrignFile = Server.MapPath(".")+"\\myText.txt";
NewFile = Server.MapPath(".")+"\\myTextCopy.txt";
File.Copy(OrignFile,NewFile,true);

C#删除文件
string delFile = Server.MapPath(".")+"\\myTextCopy.txt";
File.Delete(delFile);

C#移动文件
string OrignFile,NewFile;
OrignFile = Server.MapPath(".")+"\\myText.txt";
NewFile = Server.MapPath(".")+"\\myTextCopy.txt";
File.Move(OrignFile,NewFile);

C#创建目录
// 创建目录c:\sixAge
DirectoryInfo d=Directory.CreateDirectory("c:\\sixAge");
// d1指向c:\sixAge\sixAge1
DirectoryInfo d1=d.CreateSubdirectory("sixAge1");
// d2指向c:\sixAge\sixAge1\sixAge1_1
DirectoryInfo d2=d1.CreateSubdirectory("sixAge1_1");
// 将当前目录设为c:\sixAge
Directory.SetCurrentDirectory("c:\\sixAge");
// 创建目录c:\sixAge\sixAge2
Directory.CreateDirectory("sixAge2");
// 创建目录c:\sixAge\sixAge2\sixAge2_1
Directory.CreateDirectory("sixAge2\\sixAge2_1");

递归删除文件夹及文件
<%@ Page Language=C#%>
<%@ Import namespace="System.IO"%>
<Script runat=server>
public void DeleteFolder(string dir)
{
    if (Directory.Exists(dir)) //如果存在这个文件夹删除之
    {
        foreach(string d in Directory.GetFileSystemEntries(dir))
        {
            if(File.Exists(d))
                File.Delete(d); //直接删除其中的文件
            else
                DeleteFolder(d); //递归删除子文件夹
        }
        Directory.Delete(dir); //删除已空文件夹
        Response.Write(dir+" 文件夹删除成功");
    }
    else
        Response.Write(dir+" 该文件夹不存在"); //如果文件夹不存在则提示
}

protected void Page_Load (Object sender ,EventArgs e)
{
    string Dir="D:\\gbook\\11";
    DeleteFolder(Dir); //调用函数删除文件夹
}