C# 如何在C语言的整个代码中加入一个随机生成器

我目前正在做一个C窗口形式的数学游戏。我必须生成2个随机数1-99，并为每个数学函数显示它们。我有两个按钮，一个启动游戏，一个提交答案。我的错误是我做了两组不同的随机数，使得“开始”按钮与“提交”按钮的随机数不同。我希望每个部分都有相同的随机数，我该怎么做？我有一个想法，那就是把它放在公共课form1中，但它一直说我有一个错误

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace MathLearning
{

    public partial class Form1 : Form
    {
        //This is where I believe it is supposed to go
        //Random ranNum = new Random();
        //int num1 = ranNum.Next(1, 100);
        //int num2 = ranNum.Next(1, 100);
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {

        }
        private void btnStart_Click(object sender, EventArgs e)
        {
            btnStart.Text = "Next";
            if (rdoAddition.Checked)
            {
                int answer = num1 + num2;
                lblQuestion.Text = $"{num1 + " + " + num2 + "?"}";
            }
            if (rdoSubtraction.Checked)
            {
                int answer = num1 / num2;
                lblQuestion.Text = $"{num1 + " / " + num2 + "?"}";
            }
            if (rdoMultiplication.Checked)
            {
                int answer = num1 * num2;
                lblQuestion.Text = $"{num1 + " * " + num2 + "?"}";
            }
            if (rdoDivison.Checked)
            {
                int answer = num1 / num2;
                lblQuestion.Text = $"{num1 + " / " + num2 + "?"}";
            }
        }

        private void btnSubmit_Click(object sender, EventArgs e)
        {
            Random ranNum = new Random();
            int num1 = ranNum.Next(1, 100);
            int num2 = ranNum.Next(1, 100);
            int i = 0;
            if(rdoGenderM.Checked)
            {
                if (rdoAddition.Checked)
                {
                    int answer = num1 + num2;
                    if(int.Parse(txtAnswer.Text) == answer)
                    {
                        lblQuestion.Text = $"{"Good Job Sir\nYou got " + i + " correct Out of " + i + " problems."}";
                    }
                    else
                        lblQuestion.Text = $"{num1 + " + " + num2 + "?\nThe answer is " + answer}";
                }
            }
            //else if(rdoGenderF.Checked)
            //{
            //    lblQuestion.Text = $"{"Good Job Madam\nYou got " + i + " correct Out of " + i + " problems."}";
            //}
            //else
            //   lblQuestion.Text = $"{"Good Job Unknown gender\nYou got " + i + " correct Out of " + i + " problems."}";
        }
    }
}

---

您走的是正确的道路，只需在构造函数中初始化它们，或者在任何有意义的地方初始化它们

private Random ranNum = new Random();
private int num1;
private int num2;

public Form1()
{
    InitializeComponent();
    num1 = ranNum.Next(1, 100);
    num2 = ranNum.Next(1, 100);
}

长话短说

---

字段/属性初始值设定项无法访问非静态成员（如随机场），如果是这种情况，它将引入依赖顺序的初始化逻辑，该逻辑很容易被破坏，并且依赖于实现。但是，您可以访问构造函数中的实例成员。调用构造函数时，已调用所有其他字段和属性初始值设定项，这样可以安全地调用实例成员。

这应该可以工作，每次单击“开始”时，它都会生成新的数字

using System.Collections.Generic;
using System;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace MathLearning
{

    public partial class Form1 : Form
    {
        //This is where I believe it is supposed to go
        Random ranNum = new Random();
        int num1 = 0;
        int num2 = 0;
        int i = 0;
        int numProblems = 0;

        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {

        }
        private void btnStart_Click(object sender, EventArgs e)
        {
            btnStart.Text = "Next";
            int num1 = ranNum.Next(1, 100);
            int num2 = ranNum.Next(1, 100);
            if (rdoAddition.Checked)
            {
                int answer = num1 + num2;
                lblQuestion.Text = $"{num1 + " + " + num2 + "?"}";
            }
            if (rdoSubtraction.Checked)
            {
                int answer = num1 / num2;
                lblQuestion.Text = $"{num1 + " / " + num2 + "?"}";
            }
            if (rdoMultiplication.Checked)
            {
                int answer = num1 * num2;
                lblQuestion.Text = $"{num1 + " * " + num2 + "?"}";
            }
            if (rdoDivison.Checked)
            {
                int answer = num1 / num2;
                lblQuestion.Text = $"{num1 + " / " + num2 + "?"}";
            }

            numProblems++;
        }

        private void btnSubmit_Click(object sender, EventArgs e)
        {
            
            if(rdoGenderM.Checked)
            {
                if (rdoAddition.Checked)
                {
                    int answer = num1 + num2;
                    if(int.Parse(txtAnswer.Text) == answer)
                    {
                        i++;
                        lblQuestion.Text = $"{"Good Job Sir\nYou got " + i + " correct Out of " + numProblems + " problems."}";
                    }
                    else
                        lblQuestion.Text = $"{num1 + " + " + num2 + "?\nThe answer is " + answer}";
                }
            }
            //else if(rdoGenderF.Checked)
            //{
            //    lblQuestion.Text = $"{"Good Job Madam\nYou got " + i + " correct Out of " + numProblems + " problems."}";
            //}
            //else
            //   lblQuestion.Text = $"{"Good Job Unknown gender\nYou got " + i + " correct Out of " + numProblems + " problems."}";
        }
    }
}

---

你相信得对。将代码从btnSubmit_中删除，单击并将其放在您认为合适的位置。当您执行9/2时，您还应该使用十进制而不是int，因为int的答案是4，而不是4.5。您需要十进制或双精度来获取十进制数。OP在btnStart_Click方法中声明int-answer。你也这么做了。但是它不起作用——如果你想展示所有的代码，你应该确保它能工作。