Question

我有4个标签，有4个答案。一个是正确的。当我按下按钮时，我希望隐藏2个答案。所以我有：

string[] possible_answers = { "A", "B", "C", "D" };
string correct_answer= keyletter;
string[] wrong_answers= posibile_variante.Where(val => val != correct_answer ).ToArray();

和标签

label_0
label_2
label_1
label_3

假设

label_0 = A
label_1 = B
label_2 = C
label_3 = D

如何隐藏2个错误答案标签？

Answer 1

拥有一个包含

标签的词典

var labels = Dictionary<string, Label> { { "A", label_0 }, { "B", label_1 }, ... };

然后按下按钮点击

foreach (var wa in wrong_answers)
    labels[wa].Visible = false;

也许它不完全像你需要它，但你可以从中得到一个想法。

Answer 2

汇总了一个过于精细的例子，假设您可能想要更改给定问题的可能答案数。它根据possible_answers（ResetLabels()）中的元素数量动态设置屏幕上的标签数量，然后随机选择N（显示的＃Items - 要显示的数字）错误的数量从屏幕RemoveWrongLabels中删除的答案。 @Ondrej建议使用Take（2），但是静态地选择列表中的前2个元素（例如，用户将始终知道剩余项目中的正确答案是什么）。 MSDN：Returns a specified number of contiguous elements from the start of a sequence.

 string[] possible_answers = { "A", "B", "C", "D" };
    private void button2_Click(object sender, EventArgs e)
    {
        ResetLabels();

    }
    private void ResetLabels()
    {
        for (int i = 0; i < this.labelContainer.Controls.Count - 1; i++)
        {
            this.labelContainer.Controls[i].Dispose();
        }
        this.labelContainer.Controls.Clear();
        for (int i = possible_answers.Count() - 1; i >= 0; i--)
        {
            Label l = new Label();
            l.Text = possible_answers[i];
            l.Dock = DockStyle.Top;
            this.labelContainer.Controls.Add(l);
        }
    }
    private void button3_Click(object sender, EventArgs e)
    {
        RemoveWrongLabels(3, 2);
    }
    private void RemoveWrongLabels(int RightAnswer, int ItemsToDisplay)
    {

        Random rand = new Random();
        List<int> AnswersToHide = new List<int>();
        while (AnswersToHide.Count < labelContainer.Controls.Count - ItemsToDisplay)
        {
            int indexToHide = rand.Next(0, labelContainer.Controls.Count);
            if (!AnswersToHide.Contains(indexToHide) && labelContainer.Controls[indexToHide].Text != possible_answers[RightAnswer])
            {
                AnswersToHide.Add(indexToHide);
            }
        }


        foreach (var item in AnswersToHide)
        {
            this.labelContainer.Controls[item].Visible = false;


        }
    }

删除标签foreach

2 个答案: