Format Exception

I get "Input string was not in a correct format." on the following when attempting to pass a null value:

ProductType = new clsProductType();

ProductType.SortOrder = Int32.Parse(txtSortOrder.Text); <----- This Line.
//ProductType.SortOrder = Convert.ToInt32(txtSortOrder.Text); <----- Also tried this

Sort Order is declared as such:

public int? SortOrder { get; set; }

In the constructor for the class i have SortOrder = null, and elsewhere in the code have it take a number from a textbox

SortOrder is used to pass a variable so that it can be written to an SQL Table. The value needs to accept an integer but can also be null-able.

Any Ideas?

VS 2008

Just guessing here, but have you tried:

Here is my class:

Code:

---

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

namespace WindowsFormsApplication1
{
   
    class clsProductType
    {
        private int sortorder;

        public clsProductType()
        {
            // sortorder = null;  <<--- this won't compile for me
        }

        public int SortOrder
        {
            get
            {
                return sortorder;
            }
            set
            {
                sortorder = value;
            }
        }
    }
}

---

Here is the calling code: (WinForm)

Code:

---

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            clsProductType ProductType = new clsProductType();
            ProductType.SortOrder = System.Convert.ToInt32(this.textBox1.Text);
            MessageBox.Show("SortOrder = " + ProductType.SortOrder);

        }


}

---

Does this help you?

robert

Hey Rob,

Well first off, yours won't compile because you don't have a set + get for that declaration.

And secondly, no that didn't do anything different. Same error. Thanks for your input though!

P.S. My problem persists if anyone would like to give some pointers

Strange, mine compiles and runs.

I put a number in the tb and get a msg for the value.

right. now try it with a null value.

k, now I see. :)

Since the int is not nullable, there needs to be a value you can set to signify that no sort has been specified. Like zero or -1 or 999 or some integer and trap it in the catch:

Code:

---


private void button2_Click(object sender, EventArgs e)
        {
            const int NOSORTSPECIFIED = 0;
            clsProductType ProductType = new clsProductType();
            try
            {
                ProductType.SortOrder = Convert.ToInt32(this.textBox1.Text);

            }
            catch (FormatException exf)
            {
                ProductType.SortOrder = NOSORTSPECIFIED;
            }
            MessageBox.Show("SortOrder = " + ProductType.SortOrder);
        }

---

Beautiful! Okay that fixed it. Thanks Robert

I would have thought that "int?" would have worked....

Quote:

---

Originally Posted by WileeDarklight

I get "Input string was not in a correct format." on the following when attempting to pass a null value:

ProductType = new clsProductType();

ProductType.SortOrder = Int32.Parse(txtSortOrder.Text); <----- This Line.
[..]

---

Isn't that simply down to what is in the text box?