c# 文件/文件夹相关方法

1 判断文件夹是否存在

 1         /// <summary>文件夹是否存在
 2 /// </summary>
 3 /// <param name="dir"></param>
 4 /// <returns></returns>
 5         public static Boolean isFolderExist(string dir)
 6         {
 7             if (System.IO.Directory.Exists(dir))
 8                 return true;
 9             return false;
10         }

2 判断文件夹是否为空

 1         /// <summary>文件夹是否为空
 2 /// </summary>
 3 /// <param name="dir"></param>
 4 /// <returns></returns>
 5         public static Boolean isFolderEmpty(string dir)
 6         {
 7             if (!isFolderExist(dir)) return false;
 8             
 9             System.IO.DirectoryInfo di = new DirectoryInfo(dir);
10             if (di.GetFiles().Length + di.GetDirectories().Length == 0)
11                 return true;
12             return false;
13         }

3 创建文件夹

1         /// <summary>创建文件夹
2 /// </summary>
3 /// <param name="dir"></param>
4 /// <returns></returns>
5         public static void createFolder(string dir)
6         {
7             if (!isFolderExist(dir))
8                 System.IO.Directory.CreateDirectory(dir);
9         }

4 判断文件名是否合法

 1         /// <summary>判断文件名/文件夹名是否合法
 2 /// </summary>
 3 /// <param name="fileName"></param>
 4 /// <returns></returns>
 5         public static bool IsValidFileName(string fileName)
 6          {
 7             bool isValid = true;
 8             string errChar = "\\/:*?\"<>|";  //
 9             if (string.IsNullOrEmpty(fileName))
10             {
11                 isValid = false;
12             }
13             else
14             {
15                 for (int i = 0; i < errChar.Length; i++)
16                 {
17                     if (fileName.Contains(errChar[i].ToString()))
18                    {
19                         isValid = false;
20                         break;
21                     }
22                 }
23             }
24             return isValid;
25         }

5 删除文件夹

 1 /// <summary>删除文件夹及其内容
 2 /// </summary>
 3 /// <param name="from">原文件夹地址</param>
 4         public static void deleteFolder(string from)
 5         {
 6             if (!Directory.Exists(from))
 7                 return;
 8 
 9             foreach (string sub in Directory.GetDirectories(from))
10                 deleteFolder(sub + "\\");
11 
12             foreach (string file in Directory.GetFiles(from))
13                 File.Delete(file);
14 
15         }

6 拷贝文件夹

 1 /// <summary>拷贝文件夹及其内容
 2 /// </summary>
 3 /// <param name="from">原文件夹地址</param>
 4 /// <param name="to">目标文件夹地址</param>
 5         public static void copyFolder(string from, string to)
 6         {
 7             if (!Directory.Exists(to))
 8                 Directory.CreateDirectory(to);
 9 
10             foreach (string sub in Directory.GetDirectories(from))
11                 copyFolder(sub + "\\", to +"\\"+ System.IO.Path.GetFileName(sub));
12 
13             foreach (string file in Directory.GetFiles(from))
14                 File.Copy(file, to + "\\" + System.IO.Path.GetFileName(file), true);
15 
16         }

7 打开指定文件夹

1         /// <summary>打开指定文件夹
2 /// </summary>
3 /// <param name="dir"></param>
4         public static void openFolderInWindow(string dir)
5         {
6             System.Diagnostics.Process.Start("explorer.exe", dir);
7         }