c# File 操作

冷不防 2022-03-31 10:00 249阅读 0赞

//1.---------文件夹创建、移动、删除--------- 
 
//创建文件夹 
Directory.CreateDirectory(Server.MapPath("a")); 
Directory.CreateDirectory(Server.MapPath("b")); 
Directory.CreateDirectory(Server.MapPath("c")); 
//移动b到a 
Directory.Move(Server.MapPath("b"), Server.MapPath("a//b")); 
//删除c 
Directory.Delete(Server.MapPath("c")); 
 
//2.---------文件创建、复制、移动、删除--------- 
 
//创建文件 
//使用File.Create创建再复制/移动/删除时会提示：文件正由另一进程使用,因此该进程无法访问该文件 
//改用 FileStream 获取 File.Create 返回的 System.IO.FileStream 再进行关闭就无此问题 
FileStream fs; 
fs = File.Create(Server.MapPath("a.txt")); 
fs.Close(); 
fs = File.Create(Server.MapPath("b.txt")); 
fs.Close(); 
fs = File.Create(Server.MapPath("c.txt")); 
fs.Close(); 
//复制文件 
File.Copy(Server.MapPath("a.txt"), Server.MapPath("a//a.txt")); 
//移动文件 
File.Move(Server.MapPath("b.txt"), Server.MapPath("a//b.txt")); 
File.Move(Server.MapPath("c.txt"), Server.MapPath("a//c.txt")); 
//删除文件 
File.Delete(Server.MapPath("a.txt")); 
 
//3.---------遍历文件夹中的文件和子文件夹并显示其属性--------- 
 
if(Directory.Exists(Server.MapPath("a"))) 
\{ 
     //所有子文件夹 
     foreach(string item in Directory.GetDirectories(Server.MapPath("a"))) 
     \{ 
         Response.Write("文件夹：" + item + " "); 
         DirectoryInfo directoryinfo = new DirectoryInfo(item); 
         Response.Write("名称：" + directoryinfo.Name + " "); 
         Response.Write("路径：" + directoryinfo.FullName + " "); 
         Response.Write("创建时间：" + directoryinfo.CreationTime + " "); 
         Response.Write("上次访问时间：" + directoryinfo.LastAccessTime + " "); 
         Response.Write("上次修改时间：" + directoryinfo.LastWriteTime + " "); 
         Response.Write("父文件夹：" + directoryinfo.Parent + " "); 
         Response.Write("所在根目录：" + directoryinfo.Root + " "); 
         Response.Write(" "); 
     \} 
 
     //所有子文件 
     foreach (string item in Directory.GetFiles(Server.MapPath("a"))) 
     \{ 
         Response.Write("文件：" + item + " "); 
         FileInfo fileinfo = new FileInfo(item); 
         Response.Write("名称：" + fileinfo.Name + " "); 
         Response.Write("扩展名：" + fileinfo.Extension +" "); 
         Response.Write("路径：" + fileinfo.FullName +" "); 
         Response.Write("大小：" + fileinfo.Length +" "); 
         Response.Write("创建时间：" + fileinfo.CreationTime +" "); 
         Response.Write("上次访问时间：" + fileinfo.LastAccessTime +" "); 
         Response.Write("上次修改时间：" + fileinfo.LastWriteTime +" "); 
         Response.Write("所在文件夹：" + fileinfo.DirectoryName +" "); 
         Response.Write("文件属性：" + fileinfo.Attributes +" "); 
         Response.Write(" "); 
     \} 
\} 
 
//4.---------文件读写--------- 
 
if (File.Exists(Server.MapPath("a//a.txt"))) 
\{ 
     StreamWriter streamwrite = new StreamWriter(Server.MapPath("a//a.txt")); 
     streamwrite.WriteLine("木子屋"); 
     streamwrite.WriteLine("http://www.mzwu.com/"); 
     streamwrite.Write("2008-04-13"); 
     streamwrite.Close(); 
 
     StreamReader streamreader = new StreamReader(Server.MapPath("a//a.txt")); 
     Response.Write(streamreader.ReadLine()); 
     Response.Write(streamreader.ReadToEnd()); 
     streamreader.Close(); 
\}

获取文件的版本信息:

FileVersionInfo myFileVersionInfo1 = FileVersionInfo.GetVersionInfo("D://TEST.DLL");  
textBox1.Text="版本号: " + myFileVersionInfo1.FileVersion;

更改文件属性，删除只读文件：  
  
　　下例欲将E:/test.txt文件拷贝至D:/tmp/test.txt,但D:/tmp/test.txt已经存在。

//File.Copy(sourceFile,destinationFile,true); 用来拷贝文件  
//当destinationFile已经存在时，无法将文件file1拷贝到目标文件，  
//因此先删除destination文件，File.Delete()方法不能删除只读文件，  
//因此，如果文件属性为只读(Attributes属性中会包含有"ReadOnly")，  
//先把文件属性重置为Normal,然后再删除:  
string file1="E://test.txt";  
string destinationFile="d://tmp//test.txt";  
if(File.Exists(destinationFile))  
\{  
　FileInfo fi=new FileInfo(destinationFile);  
　if(fi.Attributes.ToString().IndexOf("ReadOnly")!=-1)  
　　fi.Attributes=FileAttributes.Normal;  
　　File.Delete(destinationFile);  
\}  
File.Copy(file1,destinationFile,true);

判断文件是否存在:File.Exists(string filePath)  
  
　　判断目录是否存在:Directory.Exists("D://LastestVersion")   
  
　　按行读取文件：

int fileCount=0;  
// Open the file just specified such that no one else can use it.  
StreamReader sr = new StreamReader(textBox1.Text.Trim());  
while(sr.Peek() > -1)//StreamReader.Peek()返回下一个可用字符，但不使用它  
\{  
　listBox1.Items.Add(sr.ReadLine());  
　fileCount++;  
\}  
sr.Close();

按行写入文件： 
StreamWriter sw = new StreamWriter("D://result.txt"); 
for(int i=0;i<10;i++) 
\{ 
　sw.WriteLine("这是第"+i.ToString()+"行数据"); 
\}