If a folder does not exist, create it

Question

I use a FileUploader control in my application. I want to save a file to a specified folder. If this folder does not exist, I want to first create it, and then save my file to this folder. If the folder already exists, then just save the file in it.

How can I do this?

Answer 1

Use System.IO.Directory.CreateDirectory.

According to the official ".NET" docs, you don't need to check if it exists first.

System.io   >   Directory   >   Directory.CreateDirectory

Any and all directories specified in path are created, unless they already exist or unless some part of path is invalid. If the directory already exists, this method does not create a new directory, but it returns a DirectoryInfo object for the existing directory.

        — learn.microsoft.com/dotnet/api/

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Answer 2

Use the below code as per How can I create a folder dynamically using the File upload server control?:

string subPath ="ImagesPath"; // Your code goes here

bool exists = System.IO.Directory.Exists(Server.MapPath(subPath));

if(!exists)
    System.IO.Directory.CreateDirectory(Server.MapPath(subPath));

Answer 3

Just write this line:

System.IO.Directory.CreateDirectory("my folder");

• If the folder does not exist yet, it will be created.
• If the folder exists already, the line will be ignored.

Reference: Article about Directory.CreateDirectory at MSDN

Of course, you can also write using System.IO; at the top of the source file and then just write Directory.CreateDirectory("my folder"); every time you want to create a folder.

Answer 4

Directory.CreateDirectory explains how to try and to create the FilePath if it does not exist.

Directory.Exists explains how to check if a FilePath exists. However, you don't need this as CreateDirectory will check it for you.

Answer 5

You can create the path if it doesn't exist yet with a method like the following:

using System.IO;

private void CreateIfMissing(string path)
{
  bool folderExists = Directory.Exists(Server.MapPath(path));
  if (!folderExists)
    Directory.CreateDirectory(Server.MapPath(path));
}

Answer 6

This method will create the folder if it does not exist and do nothing if it exists:

Directory.CreateDirectory(path);

Answer 7

You can use a try/catch clause and check to see if it exist:

  try
  {
    if (!Directory.Exists(path))
    {
       // Try to create the directory.
       DirectoryInfo di = Directory.CreateDirectory(path);
    }
  }
  catch (IOException ioex)
  {
     Console.WriteLine(ioex.Message);
  }

Answer 8

if (!Directory.Exists(Path.GetDirectoryName(fileName)))
{
    Directory.CreateDirectory(Path.GetDirectoryName(fileName));
}

Answer 9

Create a new folder, given a parent folder's path:

string pathToNewFolder = System.IO.Path.Combine(parentFolderPath, "NewSubFolder");
DirectoryInfo directory = Directory.CreateDirectory(pathToNewFolder); 
// Will create if does not already exist (otherwise will ignore)

• path to new folder given
• directory information variable so you can continue to manipulate it as you please.

Answer 10

using System.IO

if (!Directory.Exists(yourDirectory))
    Directory.CreateDirectory(yourDirectory);

Answer 11

The following code is the best line(s) of code I use that will create the directory if not present.

System.IO.Directory.CreateDirectory(HttpContext.Current.Server.MapPath("~/temp/"));

If the directory already exists, this method does not create a new directory, but it returns a DirectoryInfo object for the existing directory. >

Answer 12

Use this code if the folder is not presented under the image folder or other folders

string subPath = HttpContext.Current.Server.MapPath(@"~/Images/RequisitionBarCode/");

bool exists = System.IO.Directory.Exists(subPath);
if(!exists)
    System.IO.Directory.CreateDirectory(subPath);

string path = HttpContext.Current.Server.MapPath(@"~/Images/RequisitionBarCode/" + OrderId + ".png");

Answer 13

Use the below code. I use this code for file copy and creating a new folder.

string fileToCopy = "filelocation\\file_name.txt";
String server = Environment.UserName;
string newLocation = "C:\\Users\\" + server + "\\Pictures\\Tenders\\file_name.txt";
string folderLocation = "C:\\Users\\" + server + "\\Pictures\\Tenders\\";
bool exists = System.IO.Directory.Exists(folderLocation);

if (!exists)
{
   System.IO.Directory.CreateDirectory(folderLocation);
   if (System.IO.File.Exists(fileToCopy))
   {
     MessageBox.Show("file copied");
     System.IO.File.Copy(fileToCopy, newLocation, true);
   }
   else
   {
      MessageBox.Show("no such files");
   }
}

Answer 14

string folderName = @"D:\Demo Folder";
         // If directory does not exist, create it
         if (!Directory.Exists(folderName)) {
            Directory.CreateDirectory(folderName);
         }

Answer 15

A fancy way is to extend the FileUpload with the method you want.

Add this:

public static class FileUploadExtension
{
    public static void SaveAs(this FileUpload, string destination, bool autoCreateDirectory) { 

        if (autoCreateDirectory)
        {
            var destinationDirectory = new DirectoryInfo(Path.GetDirectoryName(destination));

            if (!destinationDirectory.Exists)
                destinationDirectory.Create();
        }

        file.SaveAs(destination);
    }
}

Then use it:

FileUpload file;
...
file.SaveAs(path,true);

Answer 16

By looking at the answers above, clearly lots of people are still not aware of the "Directory.CreateDirectory", or they don't read the official documentation carefully.

Answer 17

string root = @"C:\Temp";

string subdir = @"C:\Temp\Mahesh";

// If directory does not exist, create it.

if (!Directory.Exists(root))
{

Directory.CreateDirectory(root);

}

The CreateDirectory is also used to create a sub directory. All you have to do is to specify the path of the directory in which this subdirectory will be created in. The following code snippet creates a Mahesh subdirectory in C:\Temp directory.

// Create sub directory

if (!Directory.Exists(subdir))
{

Directory.CreateDirectory(subdir);

}

Answer 18

Derived/combined from multiple answers, implementing it for me was as easy as this:

public void Init()
{
    String platypusDir = @"C:\platypus";
    CreateDirectoryIfDoesNotExist(platypusDir);
}

private void CreateDirectoryIfDoesNotExist(string dirName)
{
    System.IO.Directory.CreateDirectory(dirName);
}