获取指定文件夹内的文件

首先需要定义文件信息记录类：

 1     public class FileData
 2     {
 3         private string myFullName;
 4         private string myName;
 5         private string myExtension;
 6         private long myLength;
 7 
 8         public  FileData(){}
 9 
10         public  FileData( string strFullName, string strName, string strExtension, long intLength )
11         {
12             this.myFullName = strFullName;
13             this.myName = strName;
14             this.myExtension = strExtension;
15             this.myLength = intLength;
16         }
17 
18         public string FullName
19         {
20             get
21             {
22                 return this.myFullName;
23             }
24         }
25 
26         public string Name
27         {
28             get
29             {
30                 return this.myName;
31             }
32         }
33 
34         public string Extension
35         {
36             get
37             {
38                 return this.myExtension;
39             }
40         }
41 
42         public long Length
43         {
44             get
45             {
46                 return this.myLength;
47             }
48         }
49 
50         public override string ToString()
51         {
52             return this.myFullName;
53         }
54     }

定义查找文件类（可递归）：

  1     public class FileExplorer
  2     {
  3         public ArrayList FileList = new ArrayList();
  4         public ArrayList Extensions = null;
  5         private string Path = "";
  6         private bool Recursive = true;
  7 
  8         public FileExplorer( string path  )
  9         {
 10             this.Path = path;
 11             this.Recursive = false;
 12             this.FileList = this.getFiles();
 13         }
 14 
 15         public FileExplorer( string path, ArrayList extensions  )
 16         {
 17             this.Path = path;
 18             this.Extensions = extensions;
 19             this.Recursive = false;
 20             this.FileList = this.getFiles();
 21         }
 22 
 23         public FileExplorer( string path, bool recursive  )
 24         {
 25             this.Path = path;
 26             this.Recursive = recursive;
 27             this.FileList = this.getFiles();
 28         }
 29 
 30         public FileExplorer( string path, ArrayList extensions, bool recursive  )
 31         {
 32             this.Path = path;
 33             this.Extensions = extensions;
 34             this.Recursive = recursive;
 35             this.FileList = this.getFiles();
 36         }
 37 
 38         public ArrayList getFiles()
 39         {
 40             DirectoryInfo   dir = new DirectoryInfo( this.Path );
 41             FileInfo[]      files;
 42             DirectoryInfo[] dirs;
 43             ArrayList List = new ArrayList();
 44                    if (! dir.Exists)
 45             {
 46                 throw new Exception("文件夹不存在: " + this.Path );
 47             }
 48 
 49             files = dir.GetFiles();
 50 
 51             foreach(FileInfo file in files)
 52             {
 53                 if( this.Extensions == null )
 54                 {
 55                     List.Add( new FileData( file.FullName, file.Name, file.Extension, file.Length ) );
 56                 }
 57                 else 
 58                 {
 59                     if( this.checkFile( file.Extension ) )
 60                     {
 61                         List.Add( new FileData( file.FullName, file.Name, file.Extension, file.Length ) );
 62                     }
 63                 }
 64             }
 65 
 66             files = null;
 67         
 68             if (! this.Recursive)
 69             {
 70                 return List;
 71             }
 72 
 73             dirs = dir.GetDirectories();
 74 
 75             foreach(DirectoryInfo subdir in dirs)
 76             {
 77                 this.Path = subdir.FullName;
 78                 ArrayList temp = new ArrayList();
 79                 temp = getFiles();
 80                 for(int i=0; i < temp.Count; i++)
 81                 {
 82                     FileData TempData = (FileData)temp[i];
 83                     List.Add( new FileData( TempData.FullName, TempData.Name, TempData.Extension, TempData.Length ) );
 84                 }
 85             }
 86         
 87             dirs = null;
 88         
 89             dir = null;
 90 
 91             return List;
 92         }
 93 
 94         private bool checkFile( string strExtension )
 95         {
 96             bool throwaway = true;
 97             for(int j=0; j<this.Extensions.Count; j++)
 98             {
 99                 if( this.Extensions[j].ToString() == strExtension )
100                 {
101                     throwaway = false;
102                 }
103             }
104 
105             if( throwaway )
106             {
107                 return false;
108             }
109             else
110             {
111                 return true;
112             }
113         }
114 
115     }