如何设置文件路径到当前目录的根目录

Question

I want to save my log file to the root of the current directory.

Right now my file path is "path": "%temp%\\logs\\log.txt" this is working fine but I want to save it to the root of current directory. For example say my app path is d:\\SampleApp\\Myapp and I want my log to save to d:\\logs\\log.txt the drive 'd' might change on deployment. So want to make it relative of which ever drive is used. I want to resolve this through appsettings.json, not through coding. TIA

Answer 1

To set your root folder where you can save a file, you need to have the direction without the root directory and then use the method Combine() from the Path class contained in System.IO .

To get all the drives, you would make use of DriveInfo class contained in System.IO namespace and their attribute Name to get the root directory.

For example:

 using System.IO; ... ... DriveInfo[] allDrives = DriveInfo.GetDrives(); foreach(DriveInfo x in allDrives) { Console.WriteLine(x.Name); } // Console: "C:\\" // Console: "D:\\" 

And then you can combine the root directory path with the file path as following:

Path.Combine(rootPath, filePathWithoutRoot);

To get the root directory of a path, you can use GetPathRoot() method from Path class that's contained in the namespace System.IO . This method returns to you the root directory from a path passed as string argument.

At this page of Microsoft MSDN you can get more information and this example of how to use it:

 string path = @"\\mydir\\"; string fileName = "myfile.ext"; string fullPath = @"C:\\mydir\\myfile.ext"; string pathRoot; pathRoot = Path.GetPathRoot(fullPath); Console.WriteLine("GetPathRoot('{0}') returns '{1}'", fullPath, pathRoot); // This code produces output similar to the following: // // GetPathRoot('C:\\mydir\\myfile.ext') returns 'C:\\' 

At this page from the Microsoft MSDN site you can get more information about it:

Path.GetPathRoot Method (String)

Answer 2

Try this (using System.IO):

string root = Path.GetPathRoot(System.Reflection.Assembly.GetEntryAssembly().Location); Also, You can use Path.GetFullPath() instead Path.GetPathRoot() and remove unwanted part from the string without hardcoding the folder name And append your folder to it.