员工姓名和电话没有信息

问题描述

我想用C＃编写没有数据库。 First Textbox有名字，第二个姓氏和第三个电话号码。

Button1保存内存中3个文本框的信息，当我按下button2时，我会看到列表框中的信息



我在下面写的时候会收到NullReferencesException错误



我试过的：

I want to write with C# without database. First Textbox has got name,second surname and third tel no.
Button1 keeps information from 3 textboxes in memory and when I press button2 I will see the information in the listbox

I get NullReferencesException error when I write below

What I have tried:

class Class1
    {
        public string[] information;
        public int counter=1;
        public string[] solution(string name, string surname, string telno)
        {
            information = new string[counter];
            
            for (int i = 0; i < information.Length; i++)
            {
                information[i] += name + surname + telno;
                counter++;
            }
            return information;
        }
        public string[] show()
        {
            string[] information= new string[counter];

            for (int i = 0; i < information.Length; i++)
            {
                information[i] += information[i].ToString();
                counter++;
            }
            return information;
        }
    }


private void button1_Click(object sender, EventArgs e)
        {
           
            Class1 yeni = new Class1();
            string[] dizi = yeni.solution(textBox1.Text, textBox2.Text, textBox3.Text);
            string metin = "";
            for (int i = 0; i < dizi.Length; i++)
                metin += dizi[i];
           
        }

        private void button2_Click(object sender, EventArgs e)
        {
          
            Class1 yeni = new Class1();
            listBox1.Items.Add(yeni.show());
           
        }

推荐答案

Class1 yeni;

private void button1_Click(object sender, EventArgs e)
{
    yeni = new Class1();
    string[] dizi = yeni.solution(textBox1.Text, textBox2.Text, textBox3.Text);
    string metin = "";
    for (int i = 0; i < dizi.Length; i++)
        metin += dizi[i];

}

private void button2_Click(object sender, EventArgs e)
{
    listBox1.Items.Add(yeni.show());

}

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