Rename some files in a folder

I have a task of changing the names of some files (that is, adding id to each name dynamically) in a folder using C#.

Example: help.txt to 1help.txt

How can I do this?

Have a look at FileInfo.

Do something like this:

void RenameThem()
{
    DirectoryInfo d = new DirectoryInfo("c:/dir/");
    FileInfo[] infos = d.GetFiles("*.myfiles");
    foreach(FileInfo f in infos)
    {
        // Do the renaming here
        File.Move(f.FullName, Path.Combine(f.DirectoryName, "1" + f.Name));
    }
}

I'll just dump this here since I needed to write this code for my own purposes.

using System;
using System.IO;

public static class FileSystemInfoExtensions
{
	public static void Rename(this FileSystemInfo item, string newName)
	{
		if (item == null)
		{
			throw new ArgumentNullException("item");
		}

		FileInfo fileInfo = item as FileInfo;
		if (fileInfo != null)
		{
			fileInfo.Rename(newName);
			return;
		}

		DirectoryInfo directoryInfo = item as DirectoryInfo;
		if (directoryInfo != null)
		{
			directoryInfo.Rename(newName);
			return;
		}

		throw new ArgumentException("Item", "Unexpected subclass of FileSystemInfo " + item.GetType());
	}

	public static void Rename(this FileInfo file, string newName)
	{
		// Validate arguments.
		if (file == null)
		{
			throw new ArgumentNullException("file");
		}
		else if (newName == null)
		{
			throw new ArgumentNullException("newName");
		}
		else if (newName.Length == 0)
		{
			throw new ArgumentException("The name is empty.", "newName");
		}
		else if (newName.IndexOf(Path.DirectorySeparatorChar) >= 0
			|| newName.IndexOf(Path.AltDirectorySeparatorChar) >= 0)
		{
			throw new ArgumentException("The name contains path separators. The file would be moved.", "newName");
		}

		// Rename file.
		string newPath = Path.Combine(file.DirectoryName, newName);
		file.MoveTo(newPath);
	}

	public static void Rename(this DirectoryInfo directory, string newName)
	{
		// Validate arguments.
		if (directory == null)
		{
			throw new ArgumentNullException("directory");
		}
		else if (newName == null)
		{
			throw new ArgumentNullException("newName");
		}
		else if (newName.Length == 0)
		{
			throw new ArgumentException("The name is empty.", "newName");
		}
		else if (newName.IndexOf(Path.DirectorySeparatorChar) >= 0
			|| newName.IndexOf(Path.AltDirectorySeparatorChar) >= 0)
		{
			throw new ArgumentException("The name contains path separators. The directory would be moved.", "newName");
		}

		// Rename directory.
		string newPath = Path.Combine(directory.Parent.FullName, newName);
		directory.MoveTo(newPath);
	}
}

The function that you are looking for is File.Move(source, destination) of the System.IO namespace. Also take a look at the DirectoryInfo class (of the same namespace) to access the contents of the folder.

On .NET Framework 4.0 I use FileInfo.MoveTo() method that only takes 1 argument

Just to move files my method looks like this

private void Move(string sourceDirName, string destDirName)
{
	DirectoryInfo dir = new DirectoryInfo(sourceDirName);
	FileInfo[] files = null;
		
	files = dir.GetFiles();
	
	foreach (FileInfo file in files)
	{
		string temppath = Path.Combine(destDirName, file.Name);
		file.MoveTo(temppath);
	}
}

to rename files my method looks like this

private void Rename(string folderPath)
{
   int fileCount = 0;
   
   DirectoryInfo dir = new DirectoryInfo(folderPath);

   files = dir.GetFiles();

   foreach (FileInfo file in files)
   {
       fileCount += 1;
       string newFileName = fileCount.ToString() + file.Name;
       string temppath = Path.Combine(folderPath, newFileName);

       file.MoveTo(temppath);
   }
}

AS you can see to Rename file it syntax is almost the same as to Move it, just need to modify the filename before using MoveTo() method.

Check out How can I rename a file in C#?. I didn't know that C# doesn't have a rename... It seems you have to use System.IO.File.Move(oldFileName, newFileName)

You can use File.Move, like this:

string oldFilePath = Path.Combine( Server.MapPath("~/uploads"), "oldFileName");
string newFilePath = Path.Combine( Server.MapPath("~/uploads"), "newFileName");

File.Move(oldFilePath, newFilePath);