C# Need Help on Converting String to Int?

Question

So... I have this section of code here, everything seems perfect but when I try to run this, it gives a formatting exception handler error.

    private void textBox1_TextChanged(object sender, EventArgs e)
    {
        if (textBox1.Text != null)
        {
            minusTime = Convert.ToInt32(textBox1.Text); // fix this... idk what's even wrong. Just trying to assign user input to minusTime...
        }
        else
        {
            minusTime = 0;
        }
    }

*Note: textbox1 is user input of an integer value. minusTime is a null integer that is to be assigned to the user input.

I've tried running this with just "Convert.ToInt32(textBox1.Text)" but it still gives me an exception saying the user inputted a wrong format... when the user input is clearly an int.

ChrisF · Accepted Answer · 2011-09-05 12:08:57Z

4

You want

bool result = Int32.TryParse(textBox1.Text, out minusTime);

This will cope if the input isn't an integer returning false.

MSDN page

There is another overload that takes in more information about the possible format of the number:

public static bool TryParse(
    string s,
    NumberStyles style,
    IFormatProvider provider,
    out int result
    )

This will cope with currency symbols etc.

answered Sep 5, 2011 at 12:08

ChrisF

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1 Comment

Shaku Over a year ago

Thank you! This worked perfectly! Thanks for getting rid of my headache, haha!

CB. · Accepted Answer · 2011-09-05 12:09:17Z

2

Try using:

minusTime = Int32.Parse(textBox1.Text);

edited Sep 5, 2011 at 12:09

answered Sep 5, 2011 at 12:07

CB.

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3 Comments

Valamas Over a year ago

Also, change this line to if (!string.IsNullOrEmpty(textBox1.Text))

Jesse van Assen Over a year ago

Int32.TryParse is another similar solution

Shaku Over a year ago

Thanks! This worked out great too! This is much simpler than what I was banging my head over...

ppiotrowicz · Accepted Answer · 2011-09-05 12:11:22Z

1

private void textBox1_TextChanged(object sender, EventArgs e)
{
    var minusTime;
    if (textBox1.Text != null && int.TryParse(textBox1.Text, out minusTime))
    {
    }
    else
    {
        minusTime = 0;
    }
}

answered Sep 5, 2011 at 12:11

ppiotrowicz

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Comments

Carlos Quintanilla · Accepted Answer · 2011-09-05 12:12:24Z

0

You can use:

int minusTime=0;
Int32.TryParse(textBox1.Text, out minusTime);

minusTime will be 0 if textBox1.Text is not integer or even if it is null.

answered Sep 5, 2011 at 12:12

Carlos Quintanilla

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