Develop Reference

Getting the basedir and filename from a path in C#

Is there any easy way to isolate the last 2 elements of the path (basedir + filename) in C# or do I need to make some complex string regex? All examples I found online show either isolating the filename, or the full path minus filename.
Example of the input:
string1 = C:\dir\example\1\test.txt
string2 = C:\dir\example\2\anotherdir\example\file.ext
string3 = /mnt/media/hdd/test/1/2/3/4/dir/file
Expected output:
string1cut = 1\test.txt
string2cut = example\file.ext
string3cut = dir/file

You can do this:
string path = #"C:\dir\example\1\test.txt";
string path2 = #"/mnt/media/hdd/test/1/2/3/4/dir/file";
string lastFolderName =
Path.GetFileName(Path.GetDirectoryName(path));
string fileName = Path.GetFileName(path);
string envPathChar = path.Contains("/") ? "/" : #"\";
string string1Cut = #$"{lastFolderName}{envPathChar}{fileName}";
outputs : 1\test.txt
path2 outputs : dir/file

Trim() doesn't work

Why does my fileName equals with something like "29.06.2014 17:04:23.pdf" ?
string dateTime = DateTime.Now.ToString();
string fileName = dateTime.Trim() + ".pdf";
I don't understand why there is a space between date and time. Even
string fileName = Datetime.Now.Date.ToString() + Datetime.Now.Hour.ToString() + ".pdf";
doesn't work.

You should use String.Replace method
string dateTimeStr = DateTime.Now.ToString();
string fileName = String.Format("{0}.pdf"
dateTimeStr.Replace(" ", String.Empty));
Because String.Trim method deals only with whitespaces at the beginning and the end of the string

Insert string into a filepath string before the file extension C#

I have a string that defines the path of a file:
string duplicateFilePath = D:\User\Documents\processed\duplicate_files\file1.jpg;
I am going to move a file to this location but sometimes a file with the identical name exists all ready. In this case I want to differentiate the filename. I have the crc value of each file available so I figured that may be good to use to ensure individual file names. I can create:
string duplicateFilePathWithCrc = duplicateFilePath + "(" + crcValue + ")";
But this gives:
D:\User\Documents\processed\duplicate_files\file1.jpg(crcvalue);
and I need:
D:\User\Documents\processed\duplicate_files\file1(crcvalue).jpg;
How can I put the crcvalue into the string before the file extension, bearing in mind there could be other .'s in the file path and file extensions vary?

Use the static methods in the System.IO.Path class to split the filename and add a suffix before the extension.
string AddSuffix(string filename, string suffix)
{
string fDir = Path.GetDirectoryName(filename);
string fName = Path.GetFileNameWithoutExtension(filename);
string fExt = Path.GetExtension(filename);
return Path.Combine(fDir, String.Concat(fName, suffix, fExt));
}
string newFilename = AddSuffix(filename, String.Format("({0})", crcValue));

int value = 42;
var path = #"D:\User\Documents\processed\duplicate_files\file1.jpg";
var fileName = String.Format("{0}({1}){2}",
Path.GetFileNameWithoutExtension(path), value, Path.GetExtension(path));
var result = Path.Combine(Path.GetDirectoryName(path), fileName);
Result:
D:\User\Documents\processed\duplicate_files\file1(42).jpg

Something like this
string duplicateFilePath = #"D:\User\Documents\processed\duplicate_files\file1.jpg";
string crcValue = "ABCDEF";
string folder = Path.GetDirectoryName(duplicateFilePath);
string filename = Path.GetFileNameWithoutExtension(duplicateFilePath);
string extension = Path.GetExtension(duplicateFilePath);
string newFilename = String.Format("{0}({1}){2}", filename, crcValue, extension);
string path_with_crc = Path.Combine(folder,newFilename );

This can also be achieved by using Replace:
using System.IO;
string duplicateFilePathWithCrc = duplicateFilePath.Replace(
Path.GetFileNameWithoutExtension(duplicateFilePath),
Path.GetFileNameWithoutExtension(duplicateFilePath + "(" + crcValue + ")"),
);

Try using the Path class (it's in the System.IO namespace):
string duplicateFilePathWithCrc = Path.Combine(
Path.GetDirectoryName(duplicateFilePath),
string.Format(
"{0}({1}){2}",
Path.GetFileNameWithoutExtension(duplicateFilePath),
crcValue,
Path.GetExtension(duplicateFilePath)
)
);

Change file name of image path in C#

My image URL is like this:
photo\myFolder\image.jpg
I want to change it so it looks like this:
photo\myFolder\image-resize.jpg
Is there any short way to do it?

This following code snippet changes the filename and leaves the path and the extenstion unchanged:
string path = #"photo\myFolder\image.jpg";
string newFileName = #"image-resize";
string dir = Path.GetDirectoryName(path);
string ext = Path.GetExtension(path);
path = Path.Combine(dir, newFileName + ext); // #"photo\myFolder\image-resize.jpg"

You can use Path.GetFileNameWithoutExtension method.
Returns the file name of the specified path string without the extension.
string path = #"photo\myFolder\image.jpg";
string file = Path.GetFileNameWithoutExtension(path);
string NewPath = path.Replace(file, file + "-resize");
Console.WriteLine(NewPath); //photo\myFolder\image-resize.jpg
Here is a DEMO.

This is what i use for file renaming
public static string AppendToFileName(string source, string appendValue)
{
return $"{Path.Combine(Path.GetDirectoryName(source), Path.GetFileNameWithoutExtension(source))}{appendValue}{Path.GetExtension(source)}";
}

I would use a method like this:
private static string GetFileNameAppendVariation(string fileName, string variation)
{
string finalPath = Path.GetDirectoryName(fileName);
string newfilename = String.Concat(Path.GetFileNameWithoutExtension(fileName), variation, Path.GetExtension(fileName));
return Path.Combine(finalPath, newfilename);
}
In this way:
string result = GetFileNameAppendVariation(#"photo\myFolder\image.jpg", "-resize");
Result: photo\myFolder\image-resize.jpg

Or the File.Move method:
System.IO.File.Move(#"photo\myFolder\image.jpg", #"photo\myFolder\image-resize.jpg");
BTW: \ is a relative Path and / a web Path, keep that in mind.

You can try this
string fileName = #"photo\myFolder\image.jpg";
string newFileName = fileName.Substring(0, fileName.LastIndexOf('.')) +
"-resize" + fileName.Substring(fileName.LastIndexOf('.'));
File.Copy(fileName, newFileName);
File.Delete(fileName);

try this
File.Copy(Server.MapPath("~/") +"photo/myFolder/image.jpg",Server.MapPath("~/") +"photo/myFolder/image-resize.jpg",true);
File.Delete(Server.MapPath("~/") + "photo/myFolder/image.jpg");

How do I properly auto append to filename if file exist

Here is what I have tried, please note that lblImageAlt.Text property has been set to 'Images/'
string ImgPath1 = lblImageAlt1.Text.ToString();
string ImgPath2 = lblImageAlt2.Text.ToString();
string ImgPath3 = lblImageAlt3.Text.ToString();
string filename1 = "";
string filename2 = "";
string filename3 = "";
if (fileuploadimages1.HasFile)
{
if (File.Exists(Server.MapPath(ImgPath1 + filename1)))
{
string extension = Path.GetExtension(filename1);
string name = Path.GetFileNameWithoutExtension(filename1);
int fileMatchCount = 1;
while (File.Exists(Server.MapPath(ImgPath1 + name + "(" + fileMatchCount + ")" + extension)))
fileMatchCount++;
fileuploadimages1.SaveAs(Server.MapPath(ImgPath1 + name + "(" + fileMatchCount + ")" + extension));
}
else
{
fileuploadimages1.SaveAs(Server.MapPath(ImgPath1 + filename1));
}
}
else
{
filename1 = "noImage.jpg";
}
but the same image does not get a number appended to it. What am I doing wrong here?

Path.GetFileName returns the whole filename with the extension.
Thus your code is checking if a file exists with a name like this:
image.jpg1
You should change the code to split the filename in two parts, the base filename and the extension, then check if the filename exists and then rebuild the filename from its parts adding the increment number until you find a non existant filename
// Extract just the filename from the posted file removing the path part (image.jpg)
filename1 = Path.GetFileName(fileuploadimages1.PostedFile.FileName);
baseFile = Path.GetFileNameWithoutExtension(fileuploadimages1.PostedFile.FileName);
extension = Path.GetExtension(fileuploadimages1.PostedFile.FileName);
int fileMatchCount = 1;
// Check if a file with the given name exists in the Images1 subfolder of the root folder of your site
while(File.Exists(Server.MapPath(Path.Combine(ImgPath1, filename1)))
{
// The given file exists already, so we now need to build
// a different (but related) filename using a counter....
// This will create a filename like 'image(001).jpg'
// and then we will restart the loop
fileName1 = string.Format("{0}({1:D3}){2}", baseFile, fileMatchCount, extension);
// ... but first increment the counter in case even the new name exists
fileMatchCount++;
}
// We exit the loop with a name that should not exists in the destination folder
fileuploadimages1.SaveAs(Server.MapPath(Path.Combine(ImgPath1, filename1));

You're not actually modifying filename1. You're checking if it ends in a (0), (1), etc. and incrementing your index, but never actually modifying the variable.

Try using
if(File.Exists(Server.MapPath(ImgPath1 + filename1)))
{
string extension = Path.GetExtension(filename1);
string name = Path.GetFileNameWithoutExtension(filename1);
int fileMatchCount = 1;
while(File.Exists(Server.MapPath(ImgPath1 + name + "(" + fileMatchCount + ")" + extension)))
fileMatchCount++;
fileuploadimages1.SaveAs(Server.MapPath(ImgPath1 + name + "(" + fileMatchCount + ")" + extension));
}
else
fileuploadimages1.SaveAs(Server.MapPath(ImgPath1 + filename1));