PictureBox上的动态点击事件

Question

我从目录中获取图片列表，并将文件名存储在List<String> 。 然后，我遍历所有这些对象，并为每个对象创建一个PictureBox ，然后向每个对象添加相同的click事件。 控件在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
}

如何获得被点击的边框并设置其边框颜色？

Answer 1

sender是被单击的PictureBox ：

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

Answer 2

sender参数确实是您的PictureBox ，向下转换为对象。 通过这种方式访问​​它：

var pictureBox = sender as PictureBox;

在其周围绘制边框并非易事，因为您将要么必须重写PictureBox的OnPaint方法，要么必须处理Paint事件。

您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);
    }
}