背景变色问题？

Question

我一次动态生成5个pictureBox,怎样才能点击哪个pictureBox让其背景变为红色呢，当再次点击另一个时，前面点击的又恢复原色。 public void ssss()
        {
            for (int i = 0; i < 5; i++)
            {
                PictureBox pic = new PictureBox();
                pic.Image = Bitmap.FromFile(file);
                pic.Location = new Point(0, i * 70);
                this.panel1.Controls.Add(pic);
                pic.Click += new EventHandler(pic_Click);
            }
        }        void pic_Click(object sender, EventArgs e)
        {
            //怎么办呢？
        }

Answer 1

  
 每创建个 PictureBox 的时候 pic.name="pic"+i.tostring()用来标志每个 PictureBox ；
void pic_Click(object sender, EventArgs e) 
        { 
            PictureBox pic =( PictureBox)sender;
            switch(pic.name)
           {
              case pic1: this.pic1.backcolor=color.red; break;
              case pic2: this.pic1.backcolor=color.red; this.pic1.backcolor=默认的颜色；break;
              ..........        }

Answer 2

private PictureBox oldPic = null;
void pic_Click(object sender, EventArgs e) 
        { 
           if(oldPic!=null) oldPic.BackColor = Color.默认颜色;
           oldPic = ((PictureBox)sender);
           oldPic.BackColor = Color.Red;    
             
 }

Answer 3

获取focus 然后设置backgroundColor