Question

我创建了一个标签数组，只需单击按钮即可看到，但由于我有许多按钮，我想指定一个按钮，只显示一个标签我在制作一个可以看到多个标签的按钮时遇到了麻烦

这是我使用的代码：

var labels = Controls.OfType<Label>().ToArray();
//And then randomly make on of them visible.
var random = new Random();
var label = labels[random.Next(0, labels.Count - 1)];
label.Visible = true;

Answer 1

在Winforms中，您只需声明一个私有Random变量，然后在其中一个按钮的Click事件中，您可以选择一个在标签数组的有效索引范围内的随机数，像：

private Label[] labels = new Label[10];  // Presumably this array is filled somewhere
private Random rnd = new Random();

private void Form1_Load(object sender, EventArgs e)
{
    for(int i = 0; i < labels.Length; i++)
    {
        labels[i] = new Label
        {
            Height = 20,
            Left = 10,
            Name = $"Label{i}",
            Tag = i,
            Text = $"Label{i}",
            Top = 10 + 20 * i,
            Visible = false
        };

        this.Controls.Add(labels[i]);
    }
}

private void button1_Click(object sender, EventArgs e)
{
    if (labels != null && labels.Length > 0)
    {
        // If needed, this will hide any currently visible labels in the array
        foreach(var label in labels.Where(label => label != null && label.Visible))
        {
            label.Visible = false;
        }

        // Pick a random label and make it visible
        labels[rnd.Next(0, labels.Length)].Visible = true;
    }
}

将按钮分配为仅显示一个随机标签

1 个答案: