C# File.AppendAllText path parameter change itself-CodePudding

I'm trying to use System.IO.File function like AppendAllText(string path, string content)

I have a project located on my Desktop (test project) and a file located on my desktop too

and here is my main function:

    static void Main(string[] args)
    {
        string path = @"‪C:\Users\Joevin\Desktop\MyFile.txt";
        string message = "Hello World !";
        File.AppendAllText(path, message);
    }

Based on what I have seen on the C# Documentation it should append my message on my txt file

But if I run my project, I have this error:

System.IO.IOException: 'The syntax of the file, directory or volume name is incorrect.: 'C:\Users\Joevin\Desktop\MyProject\MyProject\bin\Debug\net5.0\‪C:\Users\Joevin\Desktop\MyFile.txt''

So, it's appeared that when the function AppendAllText is called the path that I give is now the path of the executable generated my path stored in the "path" variable.

And i have the same error with others System.IO.FIle function that take a path as parameter

I feel that the problem is on my way to give the path to the function but I don't know how.

Can someone explain me why and how I can fix it?

CodePudding user response：

You probably copied the value for your path variable from somewhere and it contains (in the current codepage) not visible characters. It causes Path.GetFullPath to interpret your path as a relative path.

Since you copied your actual code in your question I copied your line into notepad and changed the codepage to ansi and it reveals the hidden characters

@"â€ªC:\Users\Joevin\Desktop\MyFile.txt";

CodePudding user response：

Path seems to be wrong in your case.

You can use the below code to get the desktop path.

string desktopPath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);



string path = Path.Combine(desktopPath, “MyFileName.txt”);

And then use the Path.Combine method to get the complete file path and pass to the AppendAllText method.