[c#] If a folder does not exist, create it

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?

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");

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

Directory.CreateDirectory(path);

using System.IO

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

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");
   }
}

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

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.

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.

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);
}

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));
}

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);

}

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.

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);

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. >

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);
  }

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));