We Keep Coding

Get path without file name save dialog

I would like to extract the selected path from Save dialog, excluding the file name.
The following code retrieves the full path + the file name with its extension.
placeToSaveDocument = Path.GetFullPath(saveFileDialog.FileName);
Please do not suggest to use Folder Browser Dialog instead, because I have a reason why not to use it.
Any ideas?

You're probably looking for Path.GetDirectoryName(saveFileDialog.FileName).
Example:
string filePath = #"C:\MyDir\MySubDir\myfile.ext";
string directoryPath = Path.GetDirectoryName(filePath);
//directoryPath = "C:\MyDir\MySubDir"

How to read the text file from the Application Directory text file

I have a text file in the application project classpath Directory of Windows Form Application. Now at the time of installation I am trying to write a text value into the text file. Here is my Installer class code for text file..
File.WriteAllText(AppDomain.CurrentDomain.BaseDirectory + #"\" + "ConnectionString.txt",param3);
After installation I want to retrieve the text that is entered in the "ConnectionString.txt" file and use it in the application but I am not getting how to retrieve the text value present in the text file.

try the following code snippet
Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "ConnectionString.txt")
Read Text File
string result = File.ReadAllText(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "ConnectionString.txt"));

Write file to project folder on any computer

I'm working on a project for a class. What I have to do is export parsed instructions to a file. Microsoft has this example which explains how to write to a file:
// Compose a string that consists of three lines.
string lines = "First line.\r\nSecond line.\r\nThird line.";
// Write the string to a file.
System.IO.StreamWriter file = new System.IO.StreamWriter("c:\\test.txt");
file.WriteLine(lines);
file.Close();
I'm fine with that part, but is there a way to write the file to the current project's environment/location? I'd like to do that instead of hard coding a specific path (i.e. "C:\\test.txt").

Yes, just use a relative path. If you use #".\test.txt" ( btw the # just says I'm doing a string literal, it removes the need for the escape character so you could also do ".\\test.txt" and it would write to the same place) it will write the file to the current working directory which in most cases is the folder containing your program.

You can use Assembly.GetExecutingAssembly().Location to get the path of your main assembly (.exe). Do note that if that path is inside a protected folder (for example Program Files) you won't be able to write there unless the user is an administrator - don't rely on this.
Here is sample code:
string path = System.Reflection.Assembly.GetExecutingAssembly().Location;
string fileName = Path.Combine(path, "test.txt");
This question / answer shows how to get the user's profile folder where you'll have write access. Alternatively, you can use the user's My Documents folder to save files - again, you're guaranteed to have access to it. You can get that path by calling
Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)

If you want to get the current folder location of your program use this code :
string path = Directory.GetParent(System.Reflection.Assembly.GetExecutingAssembly().Location).FullName; // return the application.exe current folder
string fileName = Path.Combine(path, "test.txt"); // make the full path as folder/test.text
Full code to write the data to the file :
string path = Directory.GetParent(System.Reflection.Assembly.GetExecutingAssembly().Location).FullName;
string fileName = Path.Combine(path, "test.txt");
if (!File.Exists(fileName))
{
// Create the file.
using (FileStream fs = File.Create(fileName))
{
Byte[] info =
new UTF8Encoding(true).GetBytes("This is some text in the file.");
// Add some information to the file.
fs.Write(info, 0, info.Length);
}
}

How to get directory of selected file?

I have a program where a user selects a file with an OpenFileDialog, I store that path (ofd.FileName) into a string FilePath, I need to get the name of the folder that the file is in, how do I do that?
Like if user selects file "C:\Users\Name\Documents\hi.txt", how do I get the folder path "C:\Users\Name\Documents" ?

The Path class offers numerous methods to handle File and Path strings
In your case you need to use
string fullFilePath = #"C:\Users\Name\Documents\hi.txt";
string pathOnly = Path.GetDirectoryName(fullFilePath);
Console.WriteLine(pathOnly);

C# getting full path of an input file in win XP

I wrote a simple console tool that reads a file and then writes something out. I intend to just drag and drop files and then out pops the output in the same directory as the input file.
All of the testing works, and when I call it from command-line, everything comes out as expected. However, when I tried dragging and dropping it in explorer, no files were created.
I did a search through the system and found that they were all dumped at Documents and Settings under my user folder, and when I printed out the full path that's what it said.
Which is weird. Wouldn't Path.GetFullPath return the absolute path of the input file? Instead it looks like it just combined that user directory path to the input's filename.
EDIT: here's the code. I feel like I've made a logic error somewhere but can't seem to see it.
filename = System.IO.Path.GetFileName(args[i]);
abspath = Path.GetFullPath(filename);
dirpath = Path.GetDirectoryName(abspath);
....
Console.WriteLine(dirpath);

Path.GetFullPath should return the absolute path of the path string you pass in.
Path.GetFileName(string path) only returns the filename and extension of the file you pass in. For example, System.IO.Path.GetFileName("C:\SomeDirectory\Test.txt"); would just return "Test.txt". You'll want to use the Path.GetDirectoryName to get the path of your input file, like so:
string inputDirectory = System.IO.Path.GetDirectoryName(args[i]);
Alternately, you can use the FileInfo class to retrieve a bunch more information about your input file. For example:
// Assuming args[i] = "C:\SomeDirectory\Test.txt"
FileInfo inputFile = new FileInfo(args[i]);
string inputDirectory = inputFile.DirectoryName; // "C:\SomeDirectory"
string inputFileName = inputFile.Name; // "Test.txt"
string fullInputFile = inputFile.FullName; // "C:\SomeDirectory\Test.txt"