pictureBox

private void pictureBox1_Click(object sender, EventArgs e)

        {

            openFileDialog1.Filter="*.jpg|*.jpg|*.bmp|*.bmp";//设置筛选列表

                DialogResult dr=openFileDialog1.ShowDialog();//显示打开文件对话框

            if(dr==DialogResult.OK )

            {

                pictureBox1.Image=new Bitmap(openFileDialog1.FileName);//添加将要显示的图像

                pictureBox1.SizeMode=PictureBoxSizeMode.StretchImage;//图像被拉伸或收缩以合适大小



            }

        }