图片框不可见

Question

抱歉，我还有一个问题。在我的代码中，我现在可以让它将图片随机分配给图片框，但不幸的是，我无法让任何图片框变得可见，单击它们后，应该会发生此事件：

    private void pictureBox1_Click(object sender, EventArgs e)
    {
        // The timer is only on after two non-matching  
        // icons have been shown to the player,  
        // so ignore any clicks if the timer is running 
        if (timer1.Enabled == true)
        {
            return;
        }


        PictureBox clickedpicturebox = sender as PictureBox;

        if (clickedpicturebox == null)
        {
            // If the clicked picture is visible, the player clicked 
            // an icon that's already been revealed -- 
            // ignore the click 
            if (clickedpicturebox.Visible == true)
                return;

            // If firstClicked is null, this is the first icon 
            // in the pair that the player clicked,  
            // so set firstClicked to the picturebox that the player  
            // clicked, make it visible, and return 
            if (firstClicked.Tag == null)
            {
                clickedpicturebox = firstClicked;
                firstClicked.Tag = clickedpicturebox.Tag;
                firstClicked.Visible = true;

            }

            // If the player gets this far, the timer isn't 
            // running and firstClicked isn't null, 
            // so this must be the second icon the player clicked 
            // Set its property to visible
            clickedpicturebox = secondClicked;
            secondClicked.Tag = clickedpicturebox.Tag;
            secondClicked.Visible = true;

            // If the player gets this far, the player  
            // clicked two different icons, so start the  
            // timer (which will wait three quarters of  
            // a second, and then hide the icons)
            timer1.Start();
        }

    }

但出于某种原因，即使我将其简化为一行：

PictureBox clickedpicturebox = 作为 PictureBox 的发件人； clickedpicturebox.Visible = true;

还是不行，是不是因为我同时选择了多张图片来应用事件？

另外，如果你需要的话，我这里有第一个图片框的属性，其他的图片框基本相同。

// 
        // pictureBox1
        // 
        this.pictureBox1.BackColor = System.Drawing.Color.Transparent;
        this.pictureBox1.Dock = System.Windows.Forms.DockStyle.Fill;
        this.pictureBox1.Location = new System.Drawing.Point(5, 5);
        this.pictureBox1.Name = "pictureBox1";
        this.pictureBox1.Size = new System.Drawing.Size(125, 119);
        this.pictureBox1.TabIndex = 0;
        this.pictureBox1.TabStop = false;
        this.pictureBox1.Visible = false;
        this.pictureBox1.Click += new System.EventHandler(this.pictureBox1_Click);

编辑：谢谢大家，现在问题已经解决了，我已经使用了标签让我可以轻松地在前景色和背景色之间进行交互，从而可以轻松地在标签和图片框之间进行转换。

Answer 1

H W和ASh都正确，问题解决了。