扫描条码软件，计数并保存在dataGridView中

Question

就是运行起来有问题，计数不会自动加1，DataGridView也没有保存数据!帮忙看看啊

Answer 1

private int a = 1;
 private void textBox3_KeyDown(object sender, KeyEventArgs e)//记录条码
 {
            if (e.KeyValue == 13)
            {
               a = a + 1;                this.label7.Text = a.ToString();//显示扫描数量
               
                float finish;//完成数
                float target;//目标数
                float pop = 0;
                finish = Convert.ToSingle(label7.Text);
                target = Convert.ToSingle(label6.Text);
                pop = finish / target * 100;//计算达成率
                label13.Text = pop.ToString() + "%";//以%形式输出达成率 
                for (int i = 0; i < dataGridView1.RowCount; i++)//存入表格
                {
                    dataGridView1[0, i].Value = textBox1.Text;
                    dataGridView1[1, i].Value = textBox3.Text;//扫描到的条码
                    dataGridView1[2, i].Value = "成功";
                }
            }
        } 

Answer 2

请注意　TextBox3 里面有没这个 事件  textBox3_KeyDown

Answer 3

private int a = 1;
private void textBox3_KeyDown(object sender, KeyEventArgs e)//记录条码
 {
             if (e.KeyValue == 13)
             {
                a = a + 1;
                this.label7.Text = Convert.ToInt32(a).ToString();//显示扫描数量
                a = a + 1;
                float finish;//完成数
                float target;//目标数
                float pop = 0;
                finish = Convert.ToSingle(label7.Text);
                target = Convert.ToSingle(label6.Text);
                pop = finish / target * 100;//计算达成率
                label13.Text = pop.ToString() + "%";//以%形式输出达成率                 if (dataGridView1.Columns.Count == 0)
                {
                    DataGridViewTextBoxColumn dgtbc1 = new DataGridViewTextBoxColumn();
                    dataGridView1.Columns.Add(dgtbc1);
                }
                DataGridViewRow newnow1 = new DataGridViewRow();
                DataGridViewRow newnow2 = new DataGridViewRow();
                DataGridViewRow newnow3 = new DataGridViewRow();
                dataGridView1.Rows.Add(newnow1);
                dataGridView1.Rows.Add(newnow2);
                dataGridView1.Rows.Add(newnow3);
                dataGridView1.Rows[dataGridView1.Rows.Count - 4].Cells[0].Value = textBox1.Text.ToString();
                dataGridView1.Rows[dataGridView1.Rows.Count - 3].Cells[0].Value = textBox3.ToString();
                dataGridView1.Rows[dataGridView1.Rows.Count - 2].Cells[0].Value = "成功";
              }
}