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

C# Replace the end of a string starting from the position of a match

I have a string (from a filename) like this: Mytext_edit1345.jpg
I just want to cut the "_edit1345" so I can get Mytext.jpg as a result.
Is Regex.Replace the best way to go for me?
string result = Regex.Replace(Bildname, pattern, "");
What pattern do i need?

You can use the Path class and string methods like String.Remove
string fileNameWOE = Path.GetFileNameWithoutExtension(fileName);
int indexOfUnderscore = fileNameWOE.IndexOf('_');
if(indexOfUnderscore >= 0)
fileNameWOE = fileNameWOE.Remove(indexOfUnderscore);
fileName = fileNameWOE + Path.GetExtension(fileName);

Use String.Substring with Path.GetExtension like:
string fileName = "Mytext_edit1345.jpg";
string newFileName = fileName;
if (fileName.Contains('_'))
{
newFileName = fileName.Substring(0, fileName.IndexOf('_')) +
Path.GetExtension(fileName);
}

Use the below pattern to match the substring(from_ upto the next .) you want to cut-down,
_[^.]*
DEMO
Your code would be,
string str = "Mytext_edit1345.jpg";
string result = Regex.Replace(str, #"_[^.]*", "");
Console.WriteLine(result);
Console.ReadLine();
IDEONE

error : The given path's format is not supported

Getting this error The given path's format is not supported. at this line
System.IO.Directory.CreateDirectory(visit_Path);
Where I am doing mistake in below code
void Create_VisitDateFolder()
{
this.pid = Convert.ToInt32(db.GetPatientID(cmbPatientName.SelectedItem.ToString()));
String strpath = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);
String path = strpath + "\\Patients\\Patient_" + pid + "\\";
string visitdate = db.GetPatient_visitDate(pid);
this.visitNo = db.GetPatientID_visitNo(pid);
string visit_Path = path +"visit_" + visitNo + "_" + visitdate+"\\";
bool IsVisitExist = System.IO.Directory.Exists(path);
bool IsVisitPath=System.IO.Directory.Exists(visit_Path);
if (!IsVisitExist)
{
System.IO.Directory.CreateDirectory(path);
}
if (!IsVisitPath)
{
System.IO.Directory.CreateDirectory(visit_Path);\\error here
}
}
getting this value for visit_Path
C:\Users\Monika\Documents\Visual Studio 2010\Projects\SonoRepo\SonoRepo\bin\Debug\Patients\Patient_16\visit_4_16-10-2013 00:00:00\

You can not have : in directory name, I suggest you to use this to string to get date in directory name:
DateTime.Now.ToString("yyyy-MM-dd hh_mm_ss");
it will create timestamp like:
2013-10-17 05_41_05
additional note:
use Path.Combine to make full path, like:
var path = Path.Combine(strpath , "Patients", "Patient_" + pid);
and last
string suffix = "visit_"+visitNo+"_" + visitdate;
var visit_Path = Path.Combine(path, suffix);

In general always use Path.Combine to create paths:
String strPath = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);
String path = Path.Combine(strPath,"Patients","Patient_" + pid);
string visitdate = db.GetPatient_visitDate(pid);
this.visitNo = db.GetPatientID_visitNo(pid);
string fileName = string.Format("visit_{0}_{1}", visitNo, visitdate);
string visit_Path = Path.Combine(path, fileName);
bool IsVisitExist = System.IO.Directory.Exists(path);
bool IsVisitPath=System.IO.Directory.Exists(visit_Path);
To replace invalid characters from a filename you could use this loop:
string invalidChars = new string(Path.GetInvalidFileNameChars()) + new string(Path.GetInvalidPathChars());
foreach (char c in invalidChars)
{
visit_Path = visit_Path.Replace(c.ToString(), ""); // or with "."
}

You can't have colons : in file paths

You can't use colons (:) in a path. You can for example Replace() them with dots (.).

Just wanted to add my two cents.
I assigned the path from a text box to string and also adding additional strings, but I forgot to add the .Text to the text box variable.
So instead of
strFinalPath = TextBox1.Text + strIntermediatePath + strFilename
I wrote
strFinalPath = TextBox1 + strIntermediatePath + strFilename
So the path became invalid because it contained invalid characters.
I was surprised that c# instead of rejecting the assignment because of type mismatch, assigned invalid value to the final string.
So look at the path assignment string closely.

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 to get full file path from file name?

How do I get the full path for a given file?
e.g. I provide:
string filename = #"test.txt";
Result should be:
Full File Path = C:\Windows\ABC\Test\test.txt

Try
string fileName = "test.txt";
FileInfo f = new FileInfo(fileName);
string fullname = f.FullName;

Use Path.GetFullPath():
http://msdn.microsoft.com/en-us/library/system.io.path.getfullpath.aspx
This should return the full path information.

You Can use:
string path = Path.GetFullPath(FileName);
it will return the Full path of that mentioned file.

Directory.GetCurrentDirectory
string dirpath = Directory.GetCurrentDirectory();
Prepend this dirpath to the filename to get the complete path.
As #Dan Puzey indicated in the comments, it would be better to use Path.Combine
Path.Combine(Directory.GetCurrentDirectory(), filename)

I know my answer it's too late, but it might helpful to other's
Try,
Void Main()
{
string filename = #"test.txt";
string filePath= AppDomain.CurrentDomain.BaseDirectory + filename ;
Console.WriteLine(filePath);
}

try..
Server.MapPath(FileUpload1.FileName);

try:
string fileName = #"test.txt";
string currentDirectory = Directory.GetCurrentDirectory();
string[] fullFilePath = Directory.GetFiles(currentDirectory, filename, SearchOption.AllDirectories);
it will return full path of all such files in the current directory and its sub directories to string array fullFilePath. If only one file exist it will be in "fullFileName[0]".

private const string BulkSetPriceFile = "test.txt";
...
var fullname = Path.GetFullPath(BulkSetPriceFile);

You can get the current path:
string AssemblyPath = Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location).ToString();
Good luck!