File open string problem~

See more:

WPF

C#5.0

[Serializable]
class SerializableNifti
{
	private ushort[] _data;

	public ushort[] Data => _data;

	public int[] Dimensions => _dimensions;

	private int[] _dimensions;
	public SerializableNifti(ushort[] data, int[] dimensions)
	{
		 _data = data;
		 _dimensions = dimensions;
	}
}

namespace NiftiNET
{

	
	class Program
	{

		public static void JsonSerialize<T>(T c, string path)
		{
			// var sr = new StreamReader(s);
			// var data = sr.ReadToEnd();
			string jsonString = JsonSerializer.Serialize(c);	
			
			if (File.Exists(path))
				File.Delete(path);
			File.WriteAllText(path, jsonString);
		}
		public static void SerializeNow<T>(T c, string path) {  
			// File f = new File("temp.dat");  
			// Stream s = f.Open(FileMode.Create);  
			if (File.Exists(path))
				File.Delete(path);
			Stream s = File.Create(path);
			BinaryFormatter b = new BinaryFormatter();  
			b.Serialize(s, c);  
			s.Close();  
		}  
		public static T DeSerializeNow<T>(string path) {  
			// File f = new File("temp.dat");
			Stream s = File.OpenRead(path);
			// Stream s = f.Open(FileMode.Open);  
			BinaryFormatter b = new BinaryFormatter();  
			var c = (T) b.Deserialize(s);  
			// Console.WriteLine(c.name);  
			s.Close();
			return c;
		}  
		
		
		static void Main(string[] args)
		{

			string inPath = @"C:\Users\User\Desktop";

            if (args.Length > 0)
				inPath = args[0];
			else
			{
				Console.WriteLine("Please give path to nii file");
				return;
			}


            Console.WriteLine($"Reading... From {inPath}");
			Nifti.NET.Nifti nifti = null; 
			if (!inPath.EndsWith("ole"))
				 nifti = NiftiFile.Read(inPath);
			Console.WriteLine($"Completed Nifti generation from {inPath}");

			var outPath = string.Empty;
			
			if (args.Length >= 2)
				outPath = args[1];

			var filetype = inPath.Split(".")
				.Skip(1) // First part is not filetype
				.Where(s => !int.TryParse(s, out _)) // ".01." is subversion and should be part of filename
				.Aggregate((acc, s) => $"{acc}.{s}");
			var filename = inPath.Split("\\/".ToCharArray()).Last().Replace("." + filetype, ""); 
				
			var jsonPath = $"{outPath}{filename}.json";
			
			if (outPath.EndsWith("json", StringComparison.InvariantCultureIgnoreCase))
				jsonPath = outPath;

I try to implement again the old C# .nii(nifti) file source.
But something strange~

string inPath = @"C:\Users\User\Desktop";

            if (args.Length > 0)
				inPath = args[0];
			else
			{
				Console.WriteLine("Please give path to nii file");
				return;
			}

For this implement,
string inPath = "C:\Users\User\Desktop";
was default. But after running my code,
surely good .nii (nifti) file exist but...
no matter how I've tried to correct to others..
Just directly go for
else
{
Console.WriteLine("Please give path to nii file");
return;
}
like manually CMD .exe running below output.

C:\Users\User\source\test\NevrolensNiftiTool\bin\x64\Debug\net5.0>NevrolensNiftiTool.exe
Please give path to nii file

C:\Users\User\source\test\NevrolensNiftiTool\bin\x64\Debug\net5.0>NevrolensNiftiTool.exe
Please give path to nii file

What's the problem?

What I have tried:

1. I've tried to change

string inPath = "C:\Users\User\Desktop";

to

var inPath = "C:\Users\User\Desktop";

or

var inPath = @"\\C:\Users\User\Desktop";

string inPath = @"\\C:\Users\User\Desktop";

string inPath = @"\\C:\Users\User\Desktop\xxx.nii";

string inPath = "C:\Users\User\Desktop\xxx.nii";

var inPath = "C:\Users\User\Desktop\xxx.nii";

Verbatim strings~
But failed and same message "Please give path to nii file"