给用户控件ucQRCode增加属性：
private PictureBox _pictureBoxFSHLQrCode;
public PictureBox PictureBoxFSHLQrCode
{
get { return _pictureBoxFSHLQrCode; }
set { this.pictureBoxFSHLQrCode = value; }
}
在Form1窗体直接调用即可：
ucQRCode uQRCode=new ucQRCode();
ucQRCode.PictureBoxFSHLQrCode.属性= 要复制或传给用户控件上的控件的值;
