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

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.

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.

61.3k9 gold badges171 silver badges165 bronze badges

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

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

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

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.

Collectives™ on Stack Overflow

C# Need Help on Converting String to Int?

4 Answers 4

1 Comment

3 Comments

Comments

Comments

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

1 Comment

3 Comments

Comments

Comments

Related