if (File.Exists(@"C:\\Users" + Environment.UserName + "\\Desktop\\test"))
{ /\
this file has no file extension
}
The file test
has no extension and I need help to either move or rename this file to something with a extension
Having no extension has no bearing on the function. Also, a rename is really just a move "in disguise", so what you want to do is
File.Move(@"C:\Users\Username\Desktop\test", @"C:\Users\Username\Desktop\potato.txt")
Please bear in mind the @ before the string, as you haven't escaped the backslashes.
There's nothing special about extensionless files. Your code is broken because you use string concatenation to build a path and you're mixing verbatim and regular string literal syntax. Use the proper framework method for this: Path.Combine()
.
string fullPath = Path.Combine(@"C:\Users", Environment.UserName, @"Desktop\test");
if(File.Exists(fullPath))
{
}
You also should use the proper framework method to get the desktop path for the current user, see How to get a path to the desktop for current user in C#? :
string desktopPath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
string fullPath = Path.Combine(desktopPath, "test");
Then you can call File.Move()
to rename the file, see Rename a file in C# :
if(File.Exists(fullPath))
{
string newPath = fullPath + ".txt";
File.Move(fullPath, newPath);
}
You can get all files without extension in this way:
var files = Directory.EnumerateFiles(@"C:\Users\Username\Desktop\")
.Where(fn => string.IsNullOrEmpty(Path.GetExtension(fn)));
Now you can loop them and change the extension:
foreach (string filePath in filPaths)
{
string fileWithNewExtension = Path.ChangeExtension(filePath, ".txt");
string newPath = Path.Combine(Path.GetDirectoryName(filePath), fileWithNewExtension);
File.Move(filePath, newPath);
}
As you can see, the Path
-class is a great help.
Update : if you just want to change the extension of a single file that you already know it seems that Dasanko has already given the answer.
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