C#：文本文件读写操作 FileHelper

 1     public class FileHelper
 2     {
 3         /// <summary>
 4         /// 获取指定路径下所有文件
 5         /// </summary>        
 6         public static List<string> GetFiles(string path)
 7         {            
 8             //using System.IO;
 9             if (!Directory.Exists(path))  //路径不存在
10                 return null;           
11             List<string> result = new List<string>();            
12             DirectoryInfo dir = new DirectoryInfo(path);            
13             DirectoryInfo[] subfolder = dir.GetDirectories();
14             if (subfolder != null&&subfolder.Length>0)
15             {
16                 foreach(DirectoryInfo item in subfolder)
17                 {                    
18                     List<string> subFiles = GetFiles(item.FullName);  //FullName:完整路径
19                     if (subFiles != null && subFiles.Count > 0)
20                         result.AddRange(subFiles);
21                 }
22             }
23             FileInfo[] files = dir.GetFiles();
24             if(files!=null)
25             {
26                 foreach(FileInfo file in files)
27                 {
28                     result.Add(file.FullName);
29                 }
30             }
31             return result;
32         }
33 
34         /// <summary>
35         /// 获取指定文件内容
36         /// 注：这里适用于读取文本类型文件
37         /// </summary>
38         public static List<string> GetTxtFileContent(string fileName)
39         {
40             if (!File.Exists(fileName)) //文件不存在
41                 return null;
42             FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
43             StreamReader reader = new StreamReader(fs, Encoding.Default);
44             List<string> result = new List<string>();
45             string line = "";
46             while((line=reader.ReadLine())!=null)
47             {
48                 result.Add(line);
49             }
50             reader.Close();
51             fs.Close();
52             return result;            
53         } 
54 
55         /// <summary>
56         /// 删除指定文件
57         /// </summary>        
58         public static void DeleteFile(string fileName)
59         {
60             File.Delete(fileName);
61         }
62 
63         /// <summary>
64         /// 创建文件
65         /// </summary>
66         /// <param name="path">文件全路径</param>
67         /// <param name="content">写入内容</param>
68         public static void CreateFile(string fileName,List<string> content=null)
69         {
70             if(!File.Exists(fileName))
71             {
72                 FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write);
73                 if (content != null && content.Count > 0)
74                 {
75                     StreamWriter sw = new StreamWriter(fs);
76                     foreach (string line in content)
77                     {
78                         sw.WriteLine(line);
79                     }
80                     sw.Close();
81                 }
82                 fs.Close();
83             }            
84         }
85         
86     }