Change File Extension Using C#

Change File Extension Using C#

There is: Path.ChangeExtension method. E.g.:

var result = Path.ChangeExtension(myffile, ".jpg");

In the case if you also want to physically change the extension, you could use File.Move method:

File.Move(myffile, Path.ChangeExtension(myffile, ".jpg"));

How to change file extension when saving selected file in a FileUpload to the server

Use Path.ChangeExtension

string path = "C:\\SomePath\\Somefile.xls";
string newPath = Path.ChangeExtension(path, ".xlsx");

In your case, probably something like this (not tested):

string fileName = Path.GetFileName(FileUpload1.PostedFile.FileName);
fileName = Server.MapPath(Path.Combine("~/ProcessedFiles/", fileName));
FileUpload1.PostedFile.SaveAs(Path.ChangeExtension(fileName, ".xlsx"));

Change extensions of all files in a directory

Path.ChangeExtension only returns a string with the new extension, it doesn't rename the file itself.

You need to use System.IO.File.Move(oldName, newName) to rename the actual file, something like this:

foreach (string myfile in filePaths)
{
filename = Path.ChangeExtension(myfile, ".txt");
System.IO.File.Move(myfile, filename);
}

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_","");
}

Changing extension of file using Path.ChangeExtension

  1. To rename a file. you should use the method File.Rename https://learn.microsoft.com/en-us/dotnet/api/microsoft.visualbasic.fileio.filesystem.renamefile?view=net-6.0

The method Path.ChangeExtension to create a new file name only!


  1. Becareful the destination directory, I guess the directory you deployed your app is not C:\Program Files (x86)\IIS Express\

Check this one.

How to get the installation directory in C# after deploying dll's

Notice that

File.Move(create.PostedFile.FileName, Path.ChangeExtension(create.PostedFile.FileName, ".jpg"));

You didn't create the file before moving. You have to manually create the posted file first

Change file extension when user changes Save As Type in SaveFileDialog

Ed,

I just tested and it works just fine.

I did this:

        SaveFileDialog sfd = new SaveFileDialog();

sfd.FileName = "untitled";
sfd.Filter = "Text (*.txt)|*.txt|Word Doc (*.doc)|*.doc";
sfd.ShowDialog();

And it automatically changes the suggested save name depending on the filter I choose.

I used the .NET 2.0 framework.

But I'm on Windows 7, which I think matters, since you see the system's file-save dialog, and the way it's implemented is what matters here.

How to change extension of string path in C#?

string strFile = @"http://login.contentraven.com/Uploads/g05fgxeto4dvsf5531yb3l45_16_8_2011_1_25_37.DOC";

string strTemp = Path.GetExtension(strFile).ToLower();

if (strTemp==".doc")
{
strFile = Path.ChangeExtension(strFile, "pdf");
}

How can I change the extension of the file name in a SaveFileDialog when the user changes the filter?

As SaveFileDialog can't be inherited, I guess you must build your own, using FileDialog as the base class.



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