Rename a File in C#

Rename a file in C#

Take a look at System.IO.File.Move, "move" the file to a new name.

System.IO.File.Move("oldfilename", "newfilename");

Renaming a directory in C#

There is no difference between moving and renaming; you should simply call Directory.Move.

In general, if you're only doing a single operation, you should use the static methods in the File and Directory classes instead of creating FileInfo and DirectoryInfo objects.

For more advice when working with files and directories, see here.

Rename existing file name

Try to use only:

if (File.Exists("newfilename"))
{
    System.IO.File.Delete("newfilename");
}

System.IO.File.Move("oldfilename", "newfilename");

How to rename a file in C#

You have several problems, looking up the value in the XML file, and renaming the file.

To look up the number corresponding to Gallery2 or whatever, I would recommend having a look at Stack Overflow question How to implement a simple XPath lookup which explains how to look up nodes/values in an XML file.

To rename a file in .NET, use something like this:

using System.IO;

FileInfo fi = new FileInfo("c:\\images\\gallery\\add.gif");
if (fi.Exists)
{
    fi.MoveTo("c:\\images\\gallery\\thumb3.gif");
}

Of course, you would use string variables instead of string literals for the paths.

That should give you enough information to piece it together and solve your particular lookup-rename problem.

Renaming a file in C# and excluding the extension of the file

To rename a single file

FileInfo currentFile = new FileInfo("c:\\Blue_ 327 132.pdf");
currentFile.MoveTo(currentFile.Directory.FullName + "\\" + newName);

where newName is your new name without path. For example, "new.pdf"

If you need to keep old file extension

FileInfo currentFile = new FileInfo("c:\\Blue_ 327 132.pdf");
currentFile.MoveTo(currentFile.Directory.FullName + "\\" + newName + currentFile.Extension);

To rename multiple files

DirectoryInfo d = new DirectoryInfo("c:\\temp\\"); 
FileInfo[] infos = d.GetFiles();
foreach(FileInfo f in infos)
{
    File.Move(f.FullName, f.FullName.ToString().Replace("abc_","");
}

Renaming files in folder c#

You can try with this code

DirectoryInfo d = new DirectoryInfo(@"C:\DirectoryToAccess");
FileInfo[] infos = d.GetFiles();
foreach(FileInfo f in infos)
{
    File.Move(f.FullName, f.FullName.Replace("abc_","")); // Careful!! This will replaces the text "abc_" anywhere in the path, including directory names.
}

Is there a way to rename the uploaded file without saving it?

Well, I finally found a way that's really simple - I guess I was overthinking this a bit. I figured I'll just share the solution, since some of you might need it. I tested it and it works for me.

You just have to create your own class HttpPostedFileBaseDerived that inherits from HttpPostedFileBase. The only difference between them is that you can make a constructor there.

    public class HttpPostedFileBaseDerived : HttpPostedFileBase
    {
        public HttpPostedFileBaseDerived(int contentLength, string contentType, string fileName, Stream inputStream)
        {
            ContentLength = contentLength;
            ContentType = contentType;
            FileName = fileName;
            InputStream = inputStream;
        }
        public override int ContentLength { get; }

        public override string ContentType { get; }

        public override string FileName { get; }

        public override Stream InputStream { get; }

        public override void SaveAs(string filename) { }

    }
}

Since constructor is not affected by ReadOnly, you can easily copy in the values from your original file object to your derived class's instance, while putting your new name in as well:

HttpPostedFileBase renameFile(HttpPostedFileBase file, string newFileName)
{
    string ext = Path.GetExtension(file.FileName); //don't forget the extension

    HttpPostedFileBaseDerived test = new HttpPostedFileBaseDerived(file.ContentLength, file.ContentType, (newFileName + ext), file.InputStream);
    return (HttpPostedFileBase)test; //cast it back to HttpPostedFileBase 
}

Once you are done you can type cast it back to HttpPostedFileBase so you wouldn't have to change any other code that you already have.

Hope this helps to anyone in the future. Also thanks to Manoj Choudhari for his answer, thanks to I learned of where not to look for the solution.

Filestream renaming file

If your document management system (DMS apparently) is using the FileStream.Name Property (which seems weird to say the least) you are out of luck, this can't be changed (easily).

You will have to see if there is an override to take the file name in your DMS call
Or rename it before you open it

E.g

System.IO.File.Move("oldfilename", "newfilename");

Or because this is stackoverflow, you could set the name with reflection

Note : i do not recommend this, this may change with future versions of .net, and who knows what issues you could have, however it does work to change the Name property

// some FileStream 
FileStream file = new FileStream(@"D:\test.txt", FileMode.Open);

var myField = file.GetType()
                  .GetField( "_fileName", BindingFlags.Instance | BindingFlags.NonPublic)

// set the name
myField.SetValue(file, "blah");

Using file.move to rename new files in C#

There are a few problems with your code.

First, you should use e.FullPath instead of e.Name, otherwise the code will try to rename the file in the current directory, instead of watched directory.

Second, to receive Created event you should include NotifyFilters.FileName.

However, this will not help you much, because the file is locked in the created and changed events until the file is copied, so you'll get an exception. Also, you'll probably receive more than one Changed event (in my tests I always receive two, regardless of the file size, but it may be different on the different versions of Windows or .Net framework).

To fix this, you may use timers or threads to accomplish the task. Here's an example using ThreadPool thread. Whenever created is fired, you create a new thread. In the thread you check whether a file is locked (trying to open file), and when the file is unlocked, do the rename.

public class FileMon
{
    public static void Run()
    {
        FileSystemWatcher fsWatcher = new FileSystemWatcher();
        fsWatcher.Path = @"C:\Test\";        
        fsWatcher.Filter = "*.*" ;
        fsWatcher.IncludeSubdirectories = true;

        // Monitor all changes specified in the NotifyFilters.
        fsWatcher.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.FileName ;

        fsWatcher.EnableRaisingEvents = true;

        // Raise Event handlers.
        fsWatcher.Changed += OnChanged;
        fsWatcher.Created += OnCreated;
        Console.WriteLine("[Enter] to end"); Console.ReadLine();
        fsWatcher.EnableRaisingEvents = false;
    }

    static void Worker(object state)
    {
        FileSystemEventArgs fsArgs = state as FileSystemEventArgs;
        bool done = false;
        FileInfo fi = new FileInfo(fsArgs.FullPath);

        do
        {
            try
            {
                using (File.Open(fsArgs.FullPath, FileMode.Open))
                {
                    done = true;
                }
            }
            catch
            {
                done = false;
            }
            Thread.Sleep(1000);
        } while (!done);
        Console.WriteLine("DOne");
        string dateStamp = DateTime.Now.ToString("fff");
        string fName = fi.FullName;
        string newFile = fsArgs.FullPath + dateStamp;
        File.Move(fsArgs.FullPath, newFile);
    }

    private static void OnCreated(object sender, FileSystemEventArgs e)
    {
        Console.WriteLine($"Created {e.ChangeType} : {e.Name}");
        ThreadPool.QueueUserWorkItem(Worker, e);
    }

    static void OnChanged(object sender, FileSystemEventArgs e)
    {
        Console.WriteLine($"{e.ChangeType} : {e.FullPath}");
    }
}