C# IO操作，文件 文件夹 长沙

一、创建文件夹

    using System.IO;  
            string name = "aa";  
            string path = Server.MapPath("") + "//" + name;  
            if (Directory.Exists(path))  
            {  
            Response.Write("<script>alert('文件夹已存在了!');history.go(-1);</script>");  
            }  
            else  
            {  
            DirectoryInfo folder=Directory.CreateDirectory(path);  
            string time = Convert.ToString(Directory.GetCreationTime(path));  
            string foldername = name.Substring(name.LastIndexOf("//") + 1);  
            Response.Write("添加成功!");  
            Response.Write("添加时间："+time);  
            Response.Write("文件夹名："+foldername);  
            }

二、删除文件夹

    using System.IO;  
            string name = "aa";  
            string path = Server.MapPath("") + "//" + name;  
            if (Directory.Exists(path))  
            {  
                Directory.Delete(path);  
                Response.Write("删除成功!");  
            }  
            else  
            {  
            Response.Write("<script>alert('文件夹不存在!');history.go(-1);</script>");  
            }

三、文件夹的移动

    string name1 = "aa";  
            string name2 = "bb//aa";      
          //移动到的文件夹里,把AA移动到BB里  
            string path1 = Server.MapPath("") + "//" + name1;  
            string path2 = Server.MapPath("") + "//" + name2;  
            if (!Directory.Exists(path1))  
            {  
                Response.Write("<script>alert('文件夹"+name1+"不存在!');history.go(-1);</script>");  
                return;  
            }  
            if (Directory.Exists(path2))  
            {  
                Response.Write("<script>alert('文件夹" + name2 + "已存在!');history.go(-1);</script>");  
                return;  
            }  
            try  
            {  
                Directory.Move(path1, path2);  
                Response.Write("文件夹移动成功!");  
            }  
            catch   
            {  
                Response.Write("<script>alert('必须在同一目录下操作!');history.go(-1);</script>");  
            }

四、获取文件夹下的文件列表

前台

    <aspistBox ID="list" runat="server" Width="200px" Height="300px" Visible="false"></aspistBox>

后台

    string name = "aa";  
            string path = Server.MapPath("") + "//" + name;  
            if (!Directory.Exists(path))  
            {  
                list.Visible = false;  
                Response.Write("<script>alert('文件夹" + name + "不存在!');history.go(-1);</script>");  
                return;  
            }  
            else  
            {  
                DirectoryInfo foldinfo = new DirectoryInfo(path);  
                FileSystemInfo[] dirs = foldinfo.GetFileSystemInfos();  
                if (dirs.Length < 1)  
                {  
                    Response.Write("<script>alert('文件夹中没数据!');history.go(-1);</script>");  
                    return;  
                }  
                list.Visible = true;  
                list.DataSource = dirs;  
                list.DataBind();  
            }

五、创建文件

    string name = "aa.aspx";  
            string path = Server.MapPath("") + "//" + name;  
            if (File.Exists(path))  
            {  
                Response.Write("<script>alert('文件" + name + "已存在!');history.go(-1);</script>");  
                return;  
            }  
            else  
            {  
                FileStream fs = File.Create(path);  
                
                fs.Close();  
                Response.Write("文件" + name + "添加成功!");  
            }

六、拷贝文件

    string name1 = "aa//1.html";  
            string name2 = "bb//1.html";   
            string path1 = Server.MapPath("") + "//" + name1;  
            string path2 = Server.MapPath("") + "//" + name2;  
            if (!File.Exists(path1))  
            {  
                Response.Write("<script>alert('文件" + name1 + "不存在!');history.go(-1);</script>");  
                return;  
            }  
            if (File.Exists(path2))  
            {  
                Response.Write("<script>alert('文件" + name2 + "已存在!');history.go(-1);</script>");  
                return;  
            }  
            try  
            {  
                File.Copy(path1, path2);  
                Response.Write("拷贝成功!");  
            }  
            catch  
            {  
                Response.Write("拷贝失败!");  
            }

七、移动文件

    string name1 = "aa//1.html";  
            string name2 = "bb//1.html";   
            string path1 = Server.MapPath("") + "//" + name1;  
            string path2 = Server.MapPath("") + "//" + name2;  
            if (!File.Exists(path1))  
            {  
                Response.Write("<script>alert('文件" + name1 + "不存在!');history.go(-1);</script>");  
                return;  
            }  
            if (File.Exists(path2))  
            {  
                Response.Write("<script>alert('文件" + name2 + "已存在!');history.go(-1);</script>");  
                return;  
            }  
            try  
            {  
                File.Move(path1, path2);  
                Response.Write("移动成功!");  
            }  
            catch  
            {  
                Response.Write("移动失败!");  
            }

八、文件删除

 1     string name = "bb//1.html";  
 2           string path = Server.MapPath("") + "//" + name;  
 3             
 4             if (!File.Exists(path))  
 5             {  
 6                 Response.Write("<script>alert('文件" + name + "不存在!');history.go(-1);</script>");  
 7                 return;  
 8             }  
 9             try  
10             {  
11                 File.Delete(path);  
12                 Response.Write("删除成功!");  
13             }  
14             catch  
15             {  
16                 Response.Write("删除失败!");  
17             }

九、获取文件的详细信息

 1     string name = "aa//11.txt";  
 2          string path = Server.MapPath("") + "//" + name;  
 3          if (!File.Exists(path))  
 4          {  
 5              Response.Write("<script>alert('文件" + name + "不存在!');history.go(-1);</script>");  
 6              return;  
 7          }  
 8          else   
 9          {  
10              FileInfo file = new FileInfo(path);  
11              string filexinxi1, filexinxi2, filexinxi3, filexinxi4, filexinxi5;  
12              //文件路径  
13              filexinxi1 = file.FullName;  
14              //文件大小,字节  
15              filexinxi2 = file.Length+"字节";  
16              //文件属性  
17              filexinxi3 = file.Attributes.ToString();  
18              //文件创建时间  
19              filexinxi4 = file.CreationTime.ToShortDateString();  
20              //文件上次访问时间  
21              filexinxi5 = file.LastAccessTime.ToShortDateString();  
22              Response.Write("文件路径:"+filexinxi1+"<br>");  
23              Response.Write("文件大小:" + filexinxi2 + "<br>");  
24              Response.Write("文件属性:" + filexinxi3 + "<br>");  
25              Response.Write("文件创建时间:" + filexinxi4 + "<br>");  
26              Response.Write("文件上次访问时间:" + filexinxi5 + "<br>");  
27          }

十、读取文件内容

 1     string name = "aa//11.html";  
 2          string path = Server.MapPath("") + "//" + name;  
 3          FileInfo fi = new FileInfo(path);  
 4          //获取文件名  
 5          string filename = fi.Name;  
 6            //获取文件扩展名  
 7          string extension = fi.Extension;  
 8            //判断该文件是否为txt格式  
 9          if (extension != ".html")  
10          {  
11              Response.Write("<script>alert('请选择html格式文件!');history.go(-1);</script>");  
12              return;  
13          }  
14          StreamReader sr = new StreamReader(path, System.Text.Encoding.Default);  
15          Response.Write("文件中的内容如下:<br>");  
16          Response.Write(sr.ReadToEnd());  
17          sr.Close();

十一、文件的写入

 1     string name = "aa//11.html";  
 2             string content1="<html><title>大家好</title></html>";  
 3           string path = Server.MapPath("") + "//" + name;  
 4           FileInfo fi = new FileInfo(path);  
 5           //获取文件名  
 6           string filename = fi.Name;  
 7             //获取文件扩展名  
 8           string extension = fi.Extension;  
 9             //判断该文件是否为txt格式  
10           if (extension != ".html")  
11           {  
12               Response.Write("<script>alert('请选择html格式文件!');history.go(-1);</script>");  
13               return;  
14           }  
15           StreamWriter sr = new StreamWriter(path, true, System.Text.Encoding.GetEncoding("gb2312"));  
16           sr.WriteLine(content1);  
17           sr.Close();  
18           Response.Write("文件写入成功!");
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原文地址：https://www.cnblogs.com/suqifeng/p/2910613.html