Referencing Text file in folder in ASP.NET Project

Question

In my ASP.NET MVC project, I have a text file called name.txt in a folder called data. I would like to write to it but I'm having a difficult time trying to reference it. My attempt:

string path = Path.Combine(Environment.CurrentDirectory, @"data/", name + ".txt");
StreamWriter file = new StreamWriter(path);
file.WriteLine("Write something in file");
file.Close();

Unfortunately, the error I receive is the path does not exist. Is there a simple and easy way to get the file path of the folders in an ASP.NET project?

Thanks

Request for clarification: one of the tags is asp.net-core, is this an ASP.NET MVC project (.NET Framework) or an ASP.NET Core MVC project (.NET Core)? — Adam Vincent
– Adam Vincent, Commented Mar 6, 2021 at 3:39

Adam Vincent · Accepted Answer · 2021-03-11 00:13:42Z

Couple things.

In ASP.NET Core, you'll want to retrieve the path that the app is running on from the IWebHostEnvironment interface. In the code below, you'll see in the constructor it's using Dependency Injection to get access to that.

It has two properties,

ContentRootPath is the root of the application
WebRootPath is the wwwroot folder

Also to simplify things I've refactored writing to the file with File.WriteAllText() which is a newer convenience wrapper around StreamWriter and does exactly what is shown in the answer.

Last thing that is personal preference I've opted for string interpolation $"" instead of concatenating with the +.

    public class FileSystemFileController : Controller
    {
        private readonly IWebHostEnvironment webHostEnvironment;

        public FileSystemFileController(IWebHostEnvironment webHostEnvironment)
        {
            this.webHostEnvironment = webHostEnvironment;
        }

        public IActionResult Index(string name)
        {
            string path = Path.Combine(webHostEnvironment.ContentRootPath, $"data/{name}.txt");
            System.IO.File.WriteAllText(path, "Write something on file");
            return View();
        }
    }

Joey · Accepted Answer · 2021-03-06 02:50:26Z

0

I think you're looking for something like this,

string path = Path.Combine(Environment.CurrentDirectory, @"data/", name + ".txt");
using (StreamWriter file = new StreamWriter(path))
{
    file.Write("Write something on file");
}
file.Close();

Take note, using will fail on your second attempt, so you might want to look at the solution provided by @Danny Tuppeny on this question how to create .txt file and write it c# asp.net

Regards,

Joey

answered Mar 6, 2021 at 2:50

Joey

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