ushort and short not supported

class Options 
{
    [Option('p', "port", Required = false, HelpText = "port number")]
    public int Port { get;set; }
}

If i change the type of Port to ushort or short I get an error when starting the program:

“ERROR(S): Error setting value to option ‘p, port’: Check if Option or Value attribute values are set properly for the given type.”

Expected behavior:

1. clear error message that the type is not supported
2. support the types ushort and short

[moh-hassan]

Default is object and need to be casted. Parser fail when trying to cast object value to short because Impossible cast from object to short More cast details

class Options
{
  [Option("port", Default = (ushort)5001)]
  public ushort Port { get; set; }

  [Option(Default=(short)100 )]
  public short ShortVal { get; set; }

  [Option( Default = (bool)true)]
  public bool? Vsible { get; set; }
	
  [Option( Default = (double)5001.4)]
  public double DoubleValue { get; set; }

  [Option( Default = (float)401.3)]
  public float FloatValue { get; set; }
}

For decimal values, it can not be casted like

//this is not allowed
//Compiler Error: CS0182 An attribute argument must be a constant expression, typeof expression or array creation expression of an attribute parameter type	
[Option( Default = (decimal)401.3)]
public decimal DecimalValue { get; set; }

decimal type is not a valid Attribute Parameter (c# language constraint).

[danielbisar]

Ok, I found it:

class Options
{
    [Option("port", Default = 5001)]
    public ushort Port { get; set; }
}

The error seems to be that I set Default to a value not of type string or uint. An explicit cast (ushort)5001 is necessary. It would be helpful if the error message on the terminal would not say:

Error setting value to option 'port': Check if Option or Value attribute values are set properly for the given type.

but more something like:

...: Expected type 'ushort', DefaultValue type 'int'

Which by the way could easily be solved, but I understand that since even dotnet needs a cast, it is more a question of if it should be done like this or not.

Maybe the parser could have an option: strict. If that is set to false the int would be converted (use Convert class from dotnet) otherwise the error message should appear.