C# delete file if exists and delete all files in folder, with the specified files and folders

There are different deletion methods according to different deletion requirements. If you want to delete all subfolders and files in a folder, you can delete this folder; if you want to delete a specified file or folder in a folder, you have to iterate and delete it.

For different needs, different code examples are given below to meet the various needs of different users, starting with the simplest.

I. C# delete file if exists

1. Physical path

public void DeleteFileIfExists(string path)
       {
              if (File.Exists(path))
                     File.Delete(path);
       }

Call: DeleteFileIfExists(@"F:\temp\test.txt");

2. Virtual path

public void DeleteFileIfExistsVirtualPath(string path)
       {
              path = Server.MapPath(path);//Convert virtual path to physical path
              if (File.Exists(path))
                     File.Delete(path);
       }

Call: DeleteFileIfExistsVirtualPath("/htm/test.html");

II. C# delete all files in folder

/// <summary>
       /// C# delete all files and subfolders in a folder
       /// </summary>
       /// <param name="dirPath">Path of the folder to be deleted</param>
       /// <returns>Delete return true, otherwise return false</returns>
       private bool DelForlder(string dirPath)
       {
              if (Directory.Exists(dirPath))
              {
                     DirectoryInfo di = new DirectoryInfo(dirPath);
                     di.Delete(true);//true means delete subdirectories and files
                     return true;
              }
              return false;
       }

Call: DelForlder(@"E:\files\test");

III. C# delete all files in folder

/// <summary>
       /// C# delete all files in directory
       /// </summary>
       /// <param name="dirPath">Path of the folder to be deleted</param>
       /// <returns>Delete all files return true, otherwise return false</returns>
       private bool DelFiles(string dirPath)
       {
              DirectoryInfo di = new DirectoryInfo(dirPath);
              FileInfo[] arrFi = di.GetFiles("*.*");
              try
              {
                     foreach (FileInfo fi in arrFi)
                     {
                            File.Delete(di + "\\" + fi.Name);
                     }
                     returntrue;
              }
              catch
              {
                     return false;
              }
       }

Call: DelFiles(@"E:\files\test");

IV. C# delete all subfolders in a folder in batches

/// <summary>
       /// C# delete all subfolders in a folder
       /// </summary>
       /// <param name="dirPath">Path of the folder to be deleted</param>
       /// <returns>Delete all folders return true, otherwise return false</returns>
       private bool DelFolders(string dirPath)
       {
              DirectoryInfo di = new DirectoryInfo(dirPath);
              DirectoryInfo[] arrDi = di.GetDirectories();
              try
              {
                     foreach (DirectoryInfo dirInfo in arrDi)
                     {
                            Directory.Delete(di + "\\" + dirInfo.ToString(), true);
                     }
                     return true;
              }
              catch
              {
                     return false;
              }
       }

Call: DelFolders(@"G:\files\test");

V. C# delete filess to be pecified in the folder in batches

/// <summary>
       /// C# delete filess to be pecified in the folder
       /// </summary>
       /// <param name="dirPath">Path of the folder to be deleted</param>
       /// <param name="files">File array to be deleted</param>
       /// <returns>Delete all specified files return true, otherwise return false</returns>
       private bool DelAppointFiles(string dirPath, string[] files)
       {
              DirectoryInfo di = new DirectoryInfo(dirPath);
              FileInfo[] arrFi = di.GetFiles("*.*");
              try
              {
                     foreach (FileInfo fi in arrFi)
                     {
                            foreach (string s in files)
                            {
                                   if(fi.Name.Equals(s))
                                   File.Delete(di + "\\" + fi.Name);
                            }
                     }
                     return true;
              }
              catch
              {
                      return false;
              }
       }

Call:

string[] arr = { "test.txt1", "test.txt2" };

DelAppointFiles(@"E:\files\test", arr);