Describe the bug

Passing a filename as an argument using the dotnet App.cs command isn’t working.

There is a bug in the argument validation part.

To Reproduce

if (args.Length == 0)
{
    Console.WriteLine("Filename input is not provided.");
    return;
}

Console.WriteLine($"{Path.Combine(Environment.CurrentDirectory, args[0])}");

• Save this snippet to a file named, say App.cs.
• Then run dotnet App.cs.
• Will print the Console message requesting the filename input.
• Now run dotnet App.cs App.cs.
• It's still printing the earlier Console message as part of input validation.
• Now pass the input without the file extension, like dotnet App.cs App
• Will print the absolute path of the input, of course, without the file extension.
• There is a bug in the argument validation part when the argument has a dot in it.

Exceptions (if any)

Further technical details