Question

I am trying to create a new object of type Invoice. I pass in the necessary parameters in the correct order.

However, it is telling me that I have included invalid arguments. I might be overlooking something very simple here, but maybe someone can point it out.

I am working on homework, however the Invoice.cs file was included for use with the project.

The only solution I am seeking is why my object will not accept the values. I have never had an issue with objects before.

Here is the code I have:

static void Main(string[] args)
{
    Invoice myInvoice = new Invoice(83, "Electric sander", 7, 57.98);
}

And here is the actual Invoice.cs file:

// Exercise 9.3 Solution: Invoice.cs
// Invoice class.
public class Invoice
{
   // declare variables for Invoice object
   private int quantityValue;
   private decimal priceValue;

   // auto-implemented property PartNumber
   public int PartNumber { get; set; }

   // auto-implemented property PartDescription
   public string PartDescription { get; set; }

   // four-argument constructor
   public Invoice( int part, string description,
      int count, decimal pricePerItem )
   {
      PartNumber = part;
      PartDescription = description;
      Quantity = count;
      Price = pricePerItem;
   } // end constructor

   // property for quantityValue; ensures value is positive
   public int Quantity
   {
      get
      {
         return quantityValue;
      } // end get
      set
      {
         if ( value > 0 ) // determine whether quantity is positive
            quantityValue = value; // valid quantity assigned
      } // end set
   } // end property Quantity

   // property for pricePerItemValue; ensures value is positive
   public decimal Price
   {
      get
      {
         return priceValue;
      } // end get
      set
      {
         if ( value >= 0M ) // determine whether price is non-negative
            priceValue = value; // valid price assigned
      } // end set
   } // end property Price

   // return string containing the fields in the Invoice in a nice format
   public override string ToString()
   {
      // left justify each field, and give large enough spaces so
      // all the columns line up
      return string.Format( "{0,-5} {1,-20} {2,-5} {3,6:C}",
         PartNumber, PartDescription, Quantity, Price );
   } // end method ToString
} // end class Invoice

Answer 1

Your method is expecting a decimal parameter where as you are passing a double value (57.98).

Per MSDN (see Remarks section),

There are no implicit conversions between floating-point types and the
decimal type.

For decimals you should add suffix ‘m’ or ‘M’

So, in your case, pass 57.98m instead of 57.98

This SO answer lists all kinds of suffixes.