C# 建立文件夹

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C#中对文件夹操作需要用到Directory Class。其中提供了创建、删除、移动、枚举等静态方法。该类不能被继承。

以下代码实现了创建文件夹。

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if (!Directory.Exists(sPath))
{
     Directory.CreateDirectory(sPath);
}

以下是MSDN上Directory Class的Sample code。

http://msdn.microsoft.com/en-us/library/system.io.directory.aspx

以下代码首先检查指定的文件夹是否存在，若存在则删除之，否则创建之。接下来移动文件夹，在其中创建文件并统计文件夹中文件数目。

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using System;
using System.IO;
 
class Test 
{
    publicstatic voidMain() 
    {
        // Specify the directories you want to manipulate.
        stringpath = @"c:\MyDir";
        stringtarget = @"c:\TestDir";
 
        try
        {
            // Determine whether the directory exists.
            if(!Directory.Exists(path)) 
            {
                // Create the directory it does not exist.
                Directory.CreateDirectory(path);
            }
 
            if(Directory.Exists(target)) 
            {
                // Delete the target to ensure it is not there.
                Directory.Delete(target,true);
            }
 
            // Move the directory.
            Directory.Move(path, target);
 
            // Create a file in the directory.
            File.CreateText(target +@"\myfile.txt");
 
            // Count the files in the target directory.
            Console.WriteLine("The number of files in {0} is {1}",
                target, Directory.GetFiles(target).Length);
        }
        catch(Exception e) 
        {
            Console.WriteLine("The process failed: {0}", e.ToString());
        }
        finally{}
    }
}

以下代码演示了如何计算文件夹大小。

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// The following example calculates the size of a directory
// and its subdirectories, if any, and displays the total size
// in bytes.
 
using System;
using System.IO;
 
public class ShowDirSize 
{
    publicstatic longDirSize(DirectoryInfo d) 
    {   
        longSize = 0;    
        // Add file sizes.
        FileInfo[] fis = d.GetFiles();
        foreach(FileInfo fi infis) 
        {     
            Size += fi.Length;   
        }
        // Add subdirectory sizes.
        DirectoryInfo[] dis = d.GetDirectories();
        foreach(DirectoryInfo di indis) 
        {
            Size += DirSize(di);  
        }
        return(Size); 
    }
    publicstatic voidMain(string[] args)
    {
        if(args.Length != 1) 
        {
            Console.WriteLine("You must provide a directory argument at the command line.");   
        }
        else
        { 
            DirectoryInfo d =new DirectoryInfo(args[0]);
            longdsize = DirSize(d);
            Console.WriteLine("The size of {0} and its subdirectories is {1} bytes.", d, dsize);
        }
    }
}