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

            }
        }