//这段代码是获得网页中的图片，并付值给本类中的ImageList

                do

                {

                    ws = ws.Substring( ws.IndexOf( "a_70" ) + 8 );

                    wiString = ws.Substring( 0, 7 );

                    //图片放置的详细的地址

                    wiString = "http://www.nmc.gov.cn/img/weather/a_70x65/" + wiString;

                    imgStream = ScreenWeather.OpenRead( wiString );

                    wImage.Add(Image.FromStream( imgStream ));

                    i = i + 1;

                }

                while ( ws.IndexOf( "a_70" ) != -1 );

                //这段代码是对页面HTML代码进行分析，提取相关的天气信息

                ws = ws.Substring( ws.IndexOf( "气温" ) + 3 );

                lapse = ws.Substring( 0, ws.IndexOf( "<" ) );

                ws = ws.Substring( ws.IndexOf( "风向" ) + 5 );

                wind = ws.Substring( 0, ws.IndexOf( "<" ) );

                ws = ws.Substring( ws.IndexOf( "日期" ) + 4 );

                date = ws.Substring( 0, ws.IndexOf( "<" ) );

            }       

        }

        //访问网页失败时显示默认的图片

        public void GetLocal()

        {

            wImage.Clear();

            //可以换成任意默认的图片

            wImage.Add(Properties.Resources.na);

        }

        //绘图函数，完成天气的绘制

        public void Paint ( PaintEventArgs e )

        {

            Point imgPoint = wPoint;

            foreach ( Image img in wImage )

            {

                e.Graphics.DrawImage( img, imgPoint );

                imgPoint.X = imgPoint.X + img.Width;

            }

            Rectangle detail=new Rectangle(wPoint.X,wPoint.Y+wImage[0].Height,wImage[0].Width*2,wImage[0].Height);

            e.Graphics.DrawString( city + " " + date + " " + wind + "\n " + lapse + " " + weatherDetail, font, brush, detail );

        }

        //析构函数

        public void Dispose()

        {

            if (brush != null)

                brush.Dispose();

            if (font != null)

                font.Dispose();

        }