动态生成PictureBox控件，涉及：PictureBox控件和flowLayoutPanel面板

box[v].Dispose();
box[v] = null;
GC.Collect();

        private void button4_Click(object sender, EventArgs e)
        {
            if (N!=0)
            {
                for (int v = 0; v < N; v++)
                {
                    box[v].Dispose();
                    box[v] = null;
                    GC.Collect();
                }
            }

            N = int.Parse(comboBox_NUM.Text); //获取要展示的图片数量;
            box = new PictureBox[N];

            DirectoryInfo dir = new DirectoryInfo("c:\\pic");
            ArrayList JpgList = new ArrayList();//链表存放图片全名;
            foreach (FileInfo file in dir.GetFiles("*.jpg")) //得到所有图片全名存入list;
            {
                JpgList.Add(file.FullName);
            }
            int i = 0;
            foreach (string value in JpgList)
            {
                if (i < N)
                {
                    box[i] = new PictureBox();
                    box[i].Size = new System.Drawing.Size(105, 105);//图片框的大小;
                    box[i].Location = new System.Drawing.Point(0, 12 + i * 100);//图片排放位置;
                    box[i].Image = Image.FromFile(value);//图片地址;
                    flowLayoutPanel1.Controls.Add(box[i]); //flowLayoutPanel增加图片
                    i++;
                }
            }
        }