CODEWITHSUNDEEP
c#arraylisttextbox
Skufler
Skufler

Reputation: 307

How to add numbers to ArrayList or List<int> from textbox

I want to add numbers to ArrayList or List from textBox. I think that when user writes numbers to textBox , textBoxe's text converts to string and splits on ArrayList elements. But I have no idea how to do it. I've tried very long time and always had an InvalidCastException.

    ArrayList Integers = new ArrayList();
    private void button1_Click_1(object sender, EventArgs e)
    {
        for (int i = 0; i < textBox1.Text.Split(new char[] { ' ' }).Length; i++)
        {
            Integers.Add();
        }
    }

Give me a hint please

Upvotes: 0

Views: 4374

Answers (3)

user7145771
user7145771

Reputation: 1

  1. Declare your list globally as 

    List<int> listInt = new List<int>();

In the click event of your button, add following code

 if(!string.IsNullOrEmpty(textBox1.Text))
                listInt.Add(Convert.ToInt32(textBox1.Text));

This would only insert Int32 values. Any other input would give an exception.

Upvotes: 0

Innat3
Innat3

Reputation: 3576

Declare an Integer List inside your Form class and use TryParse to convert the TextBox string to integer and manage possible exceptions when you add values 

    List<int> myNumbers = new List<int>();

    private void button1_Click(object sender, EventArgs e)
    {
        int i;
        foreach (string str in textBox1.Text.Split(' '))
        {
            if (int.TryParse(str, out i))
                myNumbers.Add(int.Parse(str));
        }
    }

Upvotes: 3

Saad Suri
Saad Suri

Reputation: 1382

Unless you show your code It would be hard to suggest something just a hint

TextItem is by default a string so Might be Your List is an int Try:

var a =int.Parse(textbox1.Text);
myList.Add(a);

Would be helpful for you.

Upvotes: 0

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