C# Html网页生成图片解决方案1

1.使用System.Windows.Forms命名空间下的WebBrowser控件加载网页并生成图片

GiHub参考地址：

https://github.com/tianma3798/FileOparate/

使用方法：

public static void TestOne()
{
    ThumbnailImg img = new ThumbnailImg("e:\one.png");
    //img.SetToJpeg();
    //img.SetToGif();
    ThumbnailOperate _operate = new ThumbnailOperate("http://korea.weilanliuxue.cn", img);
    _operate.GenerateImg();
    Console.WriteLine("保存成功");
}

核心代码类：

    /// <summary>
    /// 网页生成生成图片帮助类
    /// </summary>
    public class Thumbnail
    {
        /// <summary>
        /// 网页生成的图片
        /// </summary>
        private Bitmap _bitmap;
        private string _url;
        private int _browserWidth, _browserHeight, _tWidth, _tHeight;
        /// <summary>
        /// 是否使用，指定的宽度和高度
        /// </summary>
        public bool IsCustumer { get; set; }
        /// <summary>
        /// 指定网页地址，使用页面的body的高度
        /// 生成图片的，宽度和高度与body相同
        /// </summary>
        /// <param name="url">网页地址</param>
        /// <param name="browserWidth">浏览器宽度</param>
        public Thumbnail(string url, int browserWidth)
        {
            IsCustumer = false;
            _url = url;
            _browserWidth = browserWidth;
        }
        /// <summary>
        /// 初始化构造
        /// </summary>
        /// <param name="url">网页地址</param>
        /// <param name="browserWidth">浏览器宽度</param>
        /// <param name="browserHeight">浏览器高度</param>
        /// <param name="tWidth">生成图片宽度</param>
        /// <param name="tHeight">生成图片高度</param>
        public Thumbnail(string url, int browserWidth, int browserHeight, int tWidth, int tHeight)
        {
            IsCustumer = true;
            _url = url;
            _browserWidth = browserWidth;
            _browserHeight = browserHeight;
            _tWidth = tWidth;
            _tHeight = tHeight;
        }
        /// <summary>
        /// 获取网页的图片
        /// </summary>
        /// <param name="url">网页地址</param>
        /// <param name="browserWidth">浏览器宽度</param>
        /// <param name="browserHeight">浏览器高度</param>
        /// <param name="tWidth">生成图片宽度</param>
        /// <param name="tHeight">生成图片高度</param>
        public static Bitmap GetThumbnail(string url, int browserWidth, int browserHeight, int tWidth, int tHeight)
        {
            Thumbnail thumb = new Thumbnail(url, browserWidth, browserHeight, tWidth, tHeight);
            return thumb.GenerateImage();
        }
        /// <summary>
        /// 生成图片信息
        /// </summary>
        /// <returns></returns>
        public Bitmap GenerateImage()
        {
            Thread thread = new Thread(new ThreadStart(_GenerateImage));
            thread.SetApartmentState(ApartmentState.STA);
            thread.Start();
            thread.Join();
            return _bitmap;
        }
        /// <summary>
        /// 使用WebBrowser生成图片
        /// </summary>
        private void _GenerateImage()
        {
            WebBrowser browser = new WebBrowser();
            browser.ScrollBarsEnabled = false;
            browser.ScriptErrorsSuppressed = false;
            browser.Navigate(_url);
            browser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(_DocumentCompleted);
            while (browser.ReadyState != WebBrowserReadyState.Complete)
                Application.DoEvents();
            browser.Dispose();
        }
        /// <summary>
        /// 页面加载完成事件
        /// </summary>
        private void _DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            WebBrowser browser = sender as WebBrowser;
            if (IsCustumer)
            {
                //生成自定义宽度和高度的图片
                browser.ClientSize = new Size(_browserWidth, _browserHeight);
                _bitmap = new Bitmap(browser.Bounds.Width, browser.Bounds.Height);
                browser.DrawToBitmap(_bitmap, browser.Bounds);
                _bitmap = (Bitmap)_bitmap.GetThumbnailImage(_tWidth, _tHeight, null, IntPtr.Zero);
            }
            else
            {
                //生成默认body宽度和高度的图片（最常用）
                _browserHeight = 5000;
                if (browser.Document.Body != null)
                {
                    _browserHeight = browser.Document.Body.OffsetRectangle.Height;
                    browser.ClientSize = new Size(_browserWidth, _browserHeight);
                    Rectangle bodyRect = browser.Document.Body.OffsetRectangle;
                    _bitmap = new Bitmap(_browserWidth, bodyRect.Height);
                    browser.BringToFront();
                    browser.DrawToBitmap(_bitmap, bodyRect);
                    _bitmap = (Bitmap)_bitmap.GetThumbnailImage(_browserWidth, bodyRect.Height, null, IntPtr.Zero);
                }
                else
                {
                    browser.ClientSize = new Size(_browserWidth, _browserHeight);
                    _bitmap = new Bitmap(_browserWidth, _browserHeight);
                    browser.BringToFront();
                    browser.DrawToBitmap(_bitmap, new Rectangle(0,0,_browserWidth,_browserHeight));
                    _bitmap = (Bitmap)_bitmap.GetThumbnailImage(_browserWidth, _browserHeight, null, IntPtr.Zero);
                }
     
                //_bitmap = (Bitmap)_bitmap.GetThumbnailImage(bodyRect.Width, bodyRect.Height, null, IntPtr.Zero);
            }
        }
    }