C# PictureBox上的动态单击事件

我正在从一个目录中获取一个图片列表，并将文件名存储在

列表中。然后，我循环浏览其中的每一个，并为它们创建一个
PictureBox
，然后向它们添加相同的单击事件。控件位于
FlowLayoutPanel

foreach(String file in this._files){
    PictureBox box = new PictureBox();
    box.Height = 50;
    box.Width = 50;
    box.ImageLocation = file;
    box.SizeMode = PictureBoxSizeMode.Zoom;
    box.Click += this.PictureClick;

    this.flowLayoutPanel1.Controls.Add(box);
}

private void PictureClick(object sender, EventArgs e){
    // how do I get the one that has been clicked and set its border color
}

如何获取已单击的图片并设置其边框颜色？
发送者

参数实际上是您的

图片框

，向下转换为对象。通过以下方式访问它：

var pictureBox = sender as PictureBox;

在其周围绘制边框并不容易，因为您必须覆盖PictureBox的

OnPaint

方法，或者处理

Paint

事件

可以使用此类在图像周围绘制黑色细边框

public class CustomBorderPictureBox : PictureBox
{
    public bool BorderDrawn { get; private set; }

    public void ToggleBorder()
    {
        BorderDrawn = !BorderDrawn;
        Invalidate();
    }

    protected override void OnPaint(PaintEventArgs pe)
    {
        base.OnPaint(pe);
        if (BorderDrawn)
            using (var pen = new Pen(Color.Black))
                pe.Graphics.DrawRectangle(pen, 0, 0, Width - 1, Height - 1);
    }
}

---

sender

是单击的

PictureBox

：

private void PictureClick(object sender, EventArgs e) {
    PictureBox oPictureBox = (PictureBox)sender;
    // add border, do whatever else you want.
}