C# - Throwing an ArgumentOutOfRangeException - Overclock.net

guitar22891 · 11-15-07

Hey, working on a C# programming project and part of it is to:

Quote:

a. Throw an ArgumentOutOfRangeException exception if the argument for the on hand quantity is zero or less.
b. Throw an ArgumentOutOfRangeException exception if the argument for the product number is zero or less.
c. Create the ArgumentOutOfRangeException with an appropriate error message for 4a - 4b above.

Does this just mean inserting a try / catch??? code and what I have so far is below...

Code:

using System;
using System.Collections.Generic;
using System.Text;

namespace ProductMod
{
    public abstract class Product
    {
        private int productNum;
        private float quantity;
        private string description, unitOfMeasure;
       
        private const string DEF_DESC = "no description";
        private const string DEF_UM = "no unit of measure";
      

        public Product()
        {
            productNum = 0;
            quantity = 0;
            description = DEF_DESC;
            unitOfMeasure = DEF_UM;
        }// default constructor for each value

        public Product(int prN, float qtd, string desc, string un)
        {
            productNum = prN;
            quantity = qtd;

            if (desc != null && desc != "") // property method
                description = desc;
            else
                description = DEF_DESC;

            if (desc != null && un != "")// property method
                unitOfMeasure = un;
            else
                unitOfMeasure = DEF_UM;
        }//overload constructor for each variable

        public abstract double calcStdCost();
        // abstract calcStdCost method

        public override string ToString()
        {
                return
                productNum + " " +
                quantity + " " +
                description + " " +
                unitOfMeasure;       
        }// public method tostring that overides ToString method of Object class

        public int ProductNumber
        {
            get
            {
                return productNum;
            }
            set
            {
                if (value > 0)
                    productNum = value;
                // only update if value is greater than 0
            }
        }

        public float HandOnQuantity
        {
            get
            {
                return quantity;
            }
            set
            {
                if (value > 0) quantity = value;
                // only update if value is greater than 0
            }
        }
        public string Description
        {
            get
            {
                return description;
            }
            set
            {
                if (value != null && value != "") description = value;
                // only update if not blank
            }
        }
        public string UnitOfMeasure
        {
            get
            {
                return unitOfMeasure;
            }
            set
            {
                if (value != null && value != "") unitOfMeasure = value;
                // only update if not blank
            }
        }

    }
}

**BFRD** · 11-15-07

I would use an if statement and then "throw" a specific error depending on the situation. You might even create a private void that throws the error (since it will be reused).

guitar22891 · 11-15-07

Quote:

Originally Posted by BFRD

I would use an if statement and then "throw" a specific error depending on the situation. You might even create a private void that throws the error (since it will be reused).

hmm.. can you give me an example for a?

Kirmie · 11-15-07

He means use the if statement to check for your error inside a try/catch. Then if the if statement is true then do something allong the line of

Code:

throw new ArgumentOutOfRangeException("Your error statement");

and have that exception get cought and handled by the catch.

stupid · 11-15-07

U plugged that all in and I got no exceptions... were you using it in another method? Just the declarations like that shouldn't cause an error...

Kirmie · 11-15-07

Quote:

Originally Posted by stupid

U plugged that all in and I got no exceptions... were you using it in another method? Just the declarations like that shouldn't cause an error...

Unless I'm missing something guitar22891 is trying to create the throw of an error when the number is out of the range of what it should be, not what it can be. Like when the "on hand quantity" is 0 or less. If it is zero you do not have any on hand, and if its negative, well, have you every had -2 apples for lunch? Dosen't make sense but the variable is able to hold the number so you have to specifically check the variable and create a custom throw to be used if the number is incorrect.

Also, I haven't had time to check the code I put above but it should work. If not you have to do something very similar and you can find it by googling "c# force throw error" or something like that

guitar22891 · 11-18-07

Where would I throw the exception though?

Could someone give me an example? Help?

C-bro · 11-18-07

Here's a quick example. It doesn't really apply to your code, and it also probably isn't correct for syntax (I only code Java/C), but you get the idea of how they work.

Code:

public int checkProductStock(int prN)
        {
            int[] product = {12345,21314,12312};
            if (prN > -1 && prN < 3) 
                return product[prN];
            else
                throw new ArgumentOutOfRangeException();

        }

Then in your code where you're using that function, you would go:

Code:

try{

qtyRemaining = checkProductStock(prodNum);

}catch(ArgumentOutOfRangeException() ex){
//do whatever task you want to react to the invalid number
}

guitar22891 · 11-18-07

THanks!! This makes a lot more sense. Now for my code should I throw the exception in the constructor, overload constructor, or the get / set??

This is what I'm thinking:

Code:

public int ProductNumber
        {
            get
            {
                return productNum;
            }
            set
            {
                if (value <= 0)
                    throw new ArgumentOutOfRangeException
                        ("Argument for Product Number is 0 or Less");
                else
                    productNum = value;
               
            }
        }

		Overclock.net - Overclocking.net > Software, Programming and Coding > Coding and Programming > Application Programming
C# - Throwing an ArgumentOutOfRangeException

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)