asp.net提交过程

Question

我有一个表格,有2个标签初始化随机数和一个文本框,以检查添加两个随机数后答案是否正确.我遇到的问题是SUBMIT处理下一组随机数,因此结果总是不正确的.这是我到目前为止的代码.

namespace _2ndGradeMath
{

    public partial class Default : System.Web.UI.Page
    {
        Random random = new Random();

        protected void Page_Load(object sender, EventArgs e)
        {
            lblNum1.Text = random.Next(0, 10).ToString();
            lblNum3.Text = random.Next(0, 10).ToString();
            int num1 = int.Parse(lblNum1.Text);
            int num2 = int.Parse(lblNum3.Text);
            lblAnswer.Text = (num1 + num2).ToString();
            lblAnswer.Visible = false;
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            if (TextBox1.Text != lblAnswer.Text)
            {
                Button1.Attributes.Add("onClick", "javascript:alert('Incorrect');");
            }

            else if (TextBox1.Text == lblAnswer.Text)
            {
                Button1.Attributes.Add("onClick", "javascript:alert('Correct');");
            }

            TextBox1.Text = "";           
        }
    }
}

Answer 1

使用IsPostBack仅在最初加载页面时运行初始化代码:

protected void Page_Load(object sender, EventArgs e)
{
   if (!IsPostBack)    
   {
        lblNum1.Text = random.Next(0, 10).ToString();
        lblNum3.Text = random.Next(0, 10).ToString();
        int num1 = int.Parse(lblNum1.Text);
        int num2 = int.Parse(lblNum3.Text);
        lblAnswer.Text = (num1 + num2).ToString();
        lblAnswer.Visible = false;
  }
}