错误：返回 void，return 关键字后面不能跟对象表达式

    private void QuestionAnswer_Load(object sender, EventArgs e)
    {

        txtQuestion.Enabled = false;
        txtQuestion.BackColor = Color.White;
        grpMultipleChoice.Enabled = false;
        grpSingleChoice.Enabled = false;

        btnCheckAnswer.Enabled = false;
        btnNext.Enabled = false;
        btnQuit.Enabled = false;

        //force student to enter registration details
        if (txtStudentName.Text == "" && txtStudentNumber.Text == "" && txtModuleNumber.Text == "")
        {
            btnStart.Enabled = false;
            MessageBox.Show("You must enter your registration details at the upper right corner");
        }

        //declare a list
        lstNumbers = new ArrayList();

        //create a random number generator
        Random rndNumber = new Random();

        //generate 70 random numbers
        //int number = (int)(rndNumber.NextDouble() * 69) + 1;

        //lstNumbers.Add(number);
        ///use this counter to loop whenever a number is generated
        int count = 0;
        int maximumNumber = 69;

        ///disable answer button 
        btnCheckAnswer.Enabled = false;
        do
        {

            int number = (int)(rndNumber.NextDouble() * maximumNumber) + 1;
            lstNumbers.Add(number);
            if (!lstNumbers.Contains(number))
            {
                lstNumbers.Add(number);
            }
            count++;

        } while (count <= 15 * 70);//
        btnCheckAnswer_Click(sender, e);
        return lstNumbers;//returns once list is built
     }

解释： 我创建了一个数组列表，允许我在 1-70 之间随机生成，但注意到 我的数字有些重复。为了防止这种情况发生，我注意到我得到了一个 错误消息如下：

错误 1 ​​自 'wwTestAppV1.GenKnow.QuestionAnswer_Load(object, System.EventArgs)'返回 void，return 关键字后面不能跟对象表达式

我已尽一切努力来解决这个问题。当我删除它时，程序运行良好 语句但显示重复值。能否请你帮忙？

您的方法签名是：

private void QuestionAnswer_Load(object sender, EventArgs e)

返回类型void意味着您不能/不打算退回任何东西。然而，在底部，你有：

return lstNumbers;//returns once list is built

你要退货了！编译器抱怨你告诉它冲突的指令。要么将返回类型更改为ArrayList或者不返回任何东西。

话虽如此，可以对代码进行一些改进以使其更具可读性，这也将帮助您破译问题。考虑将您的代码提交到https://codereview.stackexchange.com/ https://codereview.stackexchange.com/.