string path = "C:\folder1\folder2\file.txt";
What objects or methods could I use that would give me the result folder2?
I would probably use something like:
string path = "C:/folder1/folder2/file.txt";
string lastFolderName = Path.GetFileName( Path.GetDirectoryName( path ) );
The inner call to GetDirectoryName will return the full path, while the outer call to GetFileName() will return the last path component - which will be the folder name.
This approach works whether or not the path actually exists. This approach, does however, rely on the path initially ending in a filename. If it's unknown whether the path ends in a filename or folder name - then it requires that you check the actual path to see if a file/folder exists at the location first. In that case, Dan Dimitru's answer may be more appropriate.
Try this:
string filename = #"C:/folder1/folder2/file.txt";
string FolderName = new DirectoryInfo(System.IO.Path.GetDirectoryName(filename)).Name;
Simple & clean. Only uses System.IO.FileSystem - works like a charm:
string path = "C:/folder1/folder2/file.txt";
string folder = new DirectoryInfo(path).Name;
DirectoryInfo does the job to strip directory name
string my_path = #"C:\Windows\System32";
DirectoryInfo dir_info = new DirectoryInfo(my_path);
string directory = dir_info.Name; // System32
I used this code snippet to get the directory for a path when no filename is in the path:
for example "c:\tmp\test\visual";
string dir = #"c:\tmp\test\visual";
Console.WriteLine(dir.Replace(Path.GetDirectoryName(dir) + Path.DirectorySeparatorChar, ""));
Output:
visual
string Folder = Directory.GetParent(path).Name;
var fullPath = #"C:\folder1\folder2\file.txt";
var lastDirectory = Path.GetDirectoryName(fullPath).Split('\\').LastOrDefault();
It's also important to note that while getting a list of directory names in a loop, the DirectoryInfo class gets initialized once thus allowing only first-time call. In order to bypass this limitation, ensure you use variables within your loop to store any individual directory's name.
For example, this sample code loops through a list of directories within any parent directory while adding each found directory-name inside a List of string type:
[C#]
string[] parentDirectory = Directory.GetDirectories("/yourpath");
List<string> directories = new List<string>();
foreach (var directory in parentDirectory)
{
// Notice I've created a DirectoryInfo variable.
DirectoryInfo dirInfo = new DirectoryInfo(directory);
// And likewise a name variable for storing the name.
// If this is not added, only the first directory will
// be captured in the loop; the rest won't.
string name = dirInfo.Name;
// Finally we add the directory name to our defined List.
directories.Add(name);
}
[VB.NET]
Dim parentDirectory() As String = Directory.GetDirectories("/yourpath")
Dim directories As New List(Of String)()
For Each directory In parentDirectory
' Notice I've created a DirectoryInfo variable.
Dim dirInfo As New DirectoryInfo(directory)
' And likewise a name variable for storing the name.
' If this is not added, only the first directory will
' be captured in the loop; the rest won't.
Dim name As String = dirInfo.Name
' Finally we add the directory name to our defined List.
directories.Add(name)
Next directory
Below code helps to get folder name only
public ObservableCollection items = new ObservableCollection();
try
{
string[] folderPaths = Directory.GetDirectories(stemp);
items.Clear();
foreach (string s in folderPaths)
{
items.Add(new gridItems { foldername = s.Remove(0, s.LastIndexOf('\\') + 1), folderpath = s });
}
}
catch (Exception a)
{
}
public class gridItems
{
public string foldername { get; set; }
public string folderpath { get; set; }
}
An alternative can be to split the path and get the 2nd last element from the path using Index Struct introduced in C# 8.0.
var path = #"C:\folder1\folder2\file.txt";
var folder = path.Split(#"\")[^2]; // 2nd element from the end
Console.WriteLine(folder); // folder2
I don't know why anyone, did not highlight this solution:
string path = "C:/folder1/folder2/file.txt";
string folder = new DirectoryInfo(path).Parent.Name;
Output: folder2
This is ugly but avoids allocations:
private static string GetFolderName(string path)
{
var end = -1;
for (var i = path.Length; --i >= 0;)
{
var ch = path[i];
if (ch == System.IO.Path.DirectorySeparatorChar ||
ch == System.IO.Path.AltDirectorySeparatorChar ||
ch == System.IO.Path.VolumeSeparatorChar)
{
if (end > 0)
{
return path.Substring(i + 1, end - i - 1);
}
end = i;
}
}
if (end > 0)
{
return path.Substring(0, end);
}
return path;
}
Related
I have a requirement where I want to get the Environment.SpecialFolder value from a file path.
Eg -
string filePath = #"C:\Program Files (x86)\text.txt"
//SpecialFolder sf = GetSpecialFolderAssociatedWithPath(filePath); // sf will be ProgramFilesX86
//Need something similar
I want to further use the sf to generate another path, so if we get the path corresponding to that particular SpecialFolder, that will work as well.
You could do it something like this (assuming you want to get the actual enum value for the special folder):
public static Environment.SpecialFolder? FindSpecialFolder(string filePath)
{
filePath = Path.GetFullPath(filePath);
foreach (var folder in Enum.GetValues<Environment.SpecialFolder>())
{
string directory = Environment.GetFolderPath(folder);
if (directory.Length > 0 && filePath.StartsWith(directory, StringComparison.OrdinalIgnoreCase))
return folder;
}
return null;
}
Note that I had to return a nullable because Microsoft failed to follow their own guidelines and didn't include a special "None" zero value in the Environment.SpecialFolder enum that I could return to indicate "not found".
The usage would be something like this:
string filePath = #"C:\Program Files (x86)\text.txt";
var folder = FindSpecialFolder(filePath);
if (folder == null)
Console.WriteLine("No folder found");
else
Console.WriteLine(folder.Value);
If you want both the path and the enum value, you could return them both in a tuple:
public static (Environment.SpecialFolder? specialFolder, string? directory) FindSpecialFolder(string filePath)
{
filePath = Path.GetFullPath(filePath);
foreach (var folder in Enum.GetValues<Environment.SpecialFolder>())
{
string directory = Environment.GetFolderPath(folder);
if (directory.Length > 0 && filePath.StartsWith(directory, StringComparison.OrdinalIgnoreCase))
return (folder, directory);
}
return default;
}
Which you could use like:
var folder = FindSpecialFolder(filePath);
if (folder.specialFolder == null)
Console.WriteLine("No folder found");
else
Console.WriteLine($"{folder.specialFolder.Value}: {folder.directory}");
Actually, it's possible that some of the special folders may be nested underneath other special folders, for example you might have:
C:\Path1\Path2
C:\Path1\Path2\Path3
In that event, the code above will return the first path that it matches, rather than the longest; i.e. looking for "C:\Path1\Path2\Path3\SomeFile.txt" might return the special folder for "C:\Path1\Path2" rather than the one for "C:\Path1\Path2\Path3".
If you want to handle that possibility, you'll have to find the longest matching path, for example:
public static (Environment.SpecialFolder? specialFolder, string? directory) FindSpecialFolder(string filePath)
{
filePath = Path.GetFullPath(filePath);
int longest = 0;
Environment.SpecialFolder? longestFolder = null;
string? longestDir = null;
foreach (var folder in Enum.GetValues<Environment.SpecialFolder>())
{
string directory = Environment.GetFolderPath(folder);
if (directory.Length > longest && filePath.StartsWith(directory, StringComparison.OrdinalIgnoreCase))
{
longestDir = directory;
longestFolder = folder;
longest = directory.Length;
}
}
return (longestFolder, longestDir);
}
And use it like:
var folder = FindSpecialFolder(filePath);
if (folder.specialFolder == null)
Console.WriteLine("No folder found");
else
Console.WriteLine($"{folder.specialFolder.Value}: {folder.directory}");
Another thing to be aware of is that multiple special folders might have the same path. In this case it's not possible to differentiate them, so the code will just return the first match it finds.
Also note the use of filePath = Path.GetFullPath(filePath); to ensure that relative paths are converted to absolute paths, otherwise the matching likely wouldn't work.
I'm not aware of any existing function to do this, but rolling your own isn't too difficult. For example:
private static bool TryGetSpecialFolderAssociatedWithPath(string filePath, out Environment.SpecialFolder sf)
{
foreach (Environment.SpecialFolder value in Enum.GetValues(typeof(Environment.SpecialFolder)))
{
string path = Environment.GetFolderPath(value);
if (!string.IsNullOrEmpty(path) && filePath.StartsWith(path + "\\"))
{
sf = value;
return true;
}
}
sf = default; // Actually the same as Desktop
return false;
}
Usage:
string filePath = #"C:\Program Files (x86)\text.txt";
if (TryGetSpecialFolderAssociatedWithPath(filePath, out Environment.SpecialFolder sf))
{
Console.WriteLine("Special folder is " + sf);
}
This produces the following output:
Special folder is ProgramFilesX86
One fine point to note is that I append a backslash to the returned path. If I didn't, the code snippet would've hit ProgramFiles before ProgramFilesX86.
I am making an app in C# where I am searching if the file exists in the text file or not. If it does not exist then, it would add it in the text file and then append it in a List. But, for some reason the list only takes one file and ends at that point. So, can someone help me with what is the problem in this foreach loop?
static void CheckNewFile()
{
string path_f = #"File_Address_where_Text_file_exists";
var new_file = new List<string>();
if (!File.Exists(path_f)) # Checking if the text file exists or not and then creating it
{
var myFile = File.Create(path_f);
myFile.Close();
}
DirectoryInfo hdDirectoryInWhichToSearch = new DirectoryInfo(#"File_Address_in_which_Files_need_to_be_searched");
FileInfo[] filesInDir = hdDirectoryInWhichToSearch.GetFiles("AC" + "*" + "*.*" + "AC"); # Format of the file to be searched
foreach (FileInfo foundFile in filesInDir) # foreach for the files in the directory
{
string fullName = foundFile.FullName;
int flag = 0;
var lines = File.ReadLines(path_f);
foreach (var line in lines) # Reading line by line and checking if the file exists in the text file before
{
if (String.Equals(line, fullName))
{
flag += 1;
break;
}
}
if (flag < 1)
{
if (new FileInfo(path_f).Length == 0) # File Address is appended in the File
{
//TextWriter tw = new StreamWriter(path_f);
//tw.WriteLine(fullName);
//tw.Close();
}
else
{
//using (var tw = new StreamWriter(path_f, true))
//{
// tw.WriteLine(fullName);
//}
}
new_file.Add(fullName.ToString()); # Adding File Address to the list
flag = 0;
break;
}
}
}
Remove the last break. It is causing the program flow to leave the enclosing foreach loop with the file names.
As the other poster mentioned, you're breaking out of your loop early in the if block.
However, there isn't really a need for the flag (or loop or if block) at all. Your method could be simplified greatly by using a little System.Linq and just using Directory to find the new files by comparing their paths to the contents of the input file.
For example:
static List<string> CheckForNewFiles(string filePath, string searchDir,
string searchPattern)
{
// Create file if it doesn't exist
if (!File.Exists(filePath)) using (File.Create(filePath)) ;
// Get list of files that match search pattern which aren't contained in our file
var newFiles = Directory
.GetFiles(searchDir, searchPattern)
.Where(match => !File.ReadLines(filePath).Contains(match))
.ToList();
// Add the new file paths to our file
File.AppendAllLines(filePath, newFiles);
// Return the list of new files (?)
return newFiles;
}
In use it migth look something like:
public static void Main()
{
Console.WriteLine("Checking for new files...");
var newFiles = CheckForNewFiles(#"c:\temp\paths.txt", #"c:\temp\temp", "*.png");
Console.WriteLine($"{newFiles.Count} files found since last search.");
if (newFiles.Any())
{
Console.WriteLine(" -> " + string.Join(Environment.NewLine + " -> ", newFiles));
}
Console.ReadLine();
}
I want to transfer txt and sql extentions files in their spesific folders. In the below method first createdirectory works well but second gives an IOException error and says me there is already a folder with same name.
What do I miss ?
private void InstallProgram()
{
string _sql = "sql";
string _txt = "txt";
DirectoryInfo d = new DirectoryInfo(executpath);
string destdir = Path.Combine(executpath,_sql);
Directory.CreateDirectory(destdir); // This works
string[] filebox = Directory.GetFiles(executpath, "*." + _sql);
foreach(var item in filebox)
File.Move(item,Path.Combine(destdir,Path.GetFileName(item)));
destdir = Path.Combine(executpath, _txt);
Directory.CreateDirectory(destdir); // Where I get the error
filebox = Directory.GetFiles(executpath, "*." + _txt);
foreach (var item in filebox)
File.Move(item,Path.Combine(destdir,Path.GetFileName(item)));
}
I need find the specific file/folder on my hard drive.
For example i need find a file (do1.bat) and then store the path of the file. But i dont know where can it be stored, so i have to scan all hard drive.
How can i use C# for this?
A simple way would be
var results = Directory.GetFiles("c:\\", "do1.bat", SearchOption.AllDirectories);
This would recurse through all directory and collect all files named do1.bat. Unfortunatly this will not work on complete c:\ since it will throw exceptions if you don't have access to a directory, which surely will happen.
So this is a recursive version:
private static void FindFile(DirectoryInfo currentDirectory, string pattern, List<FileInfo> results)
{
try
{
results.AddRange(currentDirectory.GetFiles(pattern, SearchOption.TopDirectoryOnly));
foreach (DirectoryInfo dir in currentDirectory.GetDirectories("*", SearchOption.TopDirectoryOnly).Where(d => d.Name != "." && d.Name != ".."))
FindFile(dir, pattern, results);
}
catch
{
// probably no access to directory
}
}
This recurses through the directory tree and tries to get the files in a directory and then all subdirectories (except . and ..).
You can use it this way:
DirectoryInfo d = new DirectoryInfo("c:\\");
List<FileInfo> results = new List<FileInfo>();
FindFile(d, "do1.bat", results);
This will find all files named do1.bat in any subdirectory of C:\\ and enlist the FileInfos in the results list.
this should provide you a list of files, matching your search pattern
string[] Result = Directory.GetFiles(#"C:\", "do1.bat", SearchOption.AllDirectories);
Refer: https://msdn.microsoft.com/en-us/library/07wt70x2(v=vs.110).aspx
List<string> lstfilepaths = new List<string>();
public static void ProcessDirectory(string targetDirectory)
{
// Process the list of files found in the directory.
string [] fileEntries = Directory.GetFiles(targetDirectory);
foreach(string fileName in fileEntries) // included as per your logic
{
if(fileName == "do1.bat")
{
ProcessFile(fileName);
}
}
// Recurse into subdirectories of this directory.
string [] subdirectoryEntries = Directory.GetDirectories(targetDirectory);
foreach(string subdirectory in subdirectoryEntries)
ProcessDirectory(subdirectory);
}
public static void ProcessFile(string path)
{
lstfilepaths.Add(path);
}
For one file:
public string FindFileByName(string fileName, string searchPath)
{
string resultPath = null;
DirectoryInfo directoryInWhichToSearch = new DirectoryInfo(searchPath);
FileInfo foundFile = directoryInWhichToSearch.GetFiles(fileName, SearchOption.AllDirectories)[0];
resultPath = foundFile.FullName;
return resultPath;
}
You can then use it like this:
string fileFullPath = FindFileByName("do1.bat", #"C:\");
I am trying to get the 2nd to last level of the directory tree that I used an array to get.
When it gets to the Console.WriteLine part, it doesn't display anything, it seems to skip that entire line.
foreach (string file in files)
{
string thepathoflife = Path.GetFullPath(file);
string filetocopy = file;
string location = file;
bool b = false;
string extension = Path.GetExtension(file);
string thenameofdoom = Path.GetFileNameWithoutExtension(file);
string filename = Path.GetFileName(file);
//here is my attempt
string dirthing = Path.GetDirectoryName(filename); //here is my attempt
System.Console.WriteLine("" + dirthing); //here is my attempt
You can call Path.GetDirectoryName twice to walk up the folder hierarchy:
Path.GetDirectoryName(Path.GetDirectoryName(Path.GetFullPath(file)))
It will return null if you are too "high" in the hierarchy.
Here are a few examples:
var path = Path.GetFullPath("example.png");
// path == "C:\\Users\\dtb\\Desktop\\example.png"
Path.GetFileName(path) // "example.png"
Path.GetFileNameWithoutExtension(path) // "example"
Path.GetExtension(path) // ".png"
Path.GetDirectoryName(Path.GetFileName(path)) // ""
Path.GetDirectoryName(path) // "C:\\Users\\dtb\\Desktop"
Path.GetDirectoryName(Path.GetDirectoryName(path)) // "C:\\Users\\dtb"