C#怎么将 HTML转换为图片或 PDF？

public partial class Form1 : Form      {public Form1()          {              InitializeComponent();          }            WebBrowser webBrowser = null;public void ConvertToImg()          {              webBrowser = new WebBrowser();//是否显式滚动条webBrowser.ScrollBarsEnabled = false;//加载HTML页面的地址webBrowser.Navigate("");            //页面加载完成执行事件webBrowser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser_DocumentCompleted);          }private void webBrowser_DocumentCompleted(object sender, EventArgs e)//这个就是当网页载入完毕后要进行的操作        {//获取解析后HTML的大小System.Drawing.Rectangle rectangle = webBrowser.Document.Body.ScrollRectangle;int width = rectangle.Width;int height = rectangle.Height;//设置解析后HTML的可视区域webBrowser.Width = width;              webBrowser.Height = height;                Bitmap bitmap = new System.Drawing.Bitmap(width, height);              webBrowser.DrawToBitmap(bitmap, new System.Drawing.Rectangle(0, 0, width, height));//设置图片文件保存路径和图片格式，格式可以自定义string filePath = AppDomain.CurrentDomain.BaseDirectory + "../../SaveFIle/" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".png";              bitmap.Save(filePath, System.Drawing.Imaging.ImageFormat.Png);          }private void button1_Click(object sender, EventArgs e)          {              ConvertToImg();          }      }

public partial class Form1 : Form      {public Form1()          {              InitializeComponent();          }            WebBrowser webBrowser = null;public void ConvertToImg()          {string html = "<div><table border = \"1\" cellspacing = \"0\" cellpadding = \"3\" style = \"text-align:center;\"><tr><th style = \"width:60px;\">字段1</th><th style = \"width:60px;\">字段2</th><th style = \"width:60px;\">字段3</th></tr><tr style = \"color:green;\"><td>小明</td><td>22</td><td>185</td></tr><tr style = \"color:red;\"><td>小青</td><td>21</td><td>170</td></tr></table></div>";                webBrowser = new WebBrowser();//是否显式滚动条webBrowser.ScrollBarsEnabled = false;//加载 htmlwebBrowser.DocumentText = html;            //页面加载完成执行事件webBrowser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser_DocumentCompleted);          }private void webBrowser_DocumentCompleted(object sender, EventArgs e)//这个就是当网页载入完毕后要进行的操作        {//获取解析后HTML的大小System.Drawing.Rectangle rectangle = webBrowser.Document.Body.ScrollRectangle;int width = rectangle.Width;int height = rectangle.Height;//设置解析后HTML的可视区域webBrowser.Width = width;              webBrowser.Height = height;                Bitmap bitmap = new System.Drawing.Bitmap(width, height);              webBrowser.DrawToBitmap(bitmap, new System.Drawing.Rectangle(0, 0, width, height));//设置图片文件保存路径和图片格式，格式可以自定义string filePath = AppDomain.CurrentDomain.BaseDirectory + "../../SaveFIle/" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".png";              bitmap.Save(filePath, System.Drawing.Imaging.ImageFormat.Png);          }private void button1_Click(object sender, EventArgs e)          {              ConvertToImg();          }      }

public partial class Form1 : Form      {public Form1()          {              InitializeComponent();          }            WebBrowser webBrowser = null;public void ConvertToImg()          {string html = "<div><table border = \"1\" cellspacing = \"0\" cellpadding = \"3\" style = \"text-align:center;\"><tr><th style = \"width:60px;\">字段1</th><th style = \"width:60px;\">字段2</th><th style = \"width:60px;\">字段3</th></tr><tr style = \"color:green;\"><td>小明</td><td>22</td><td>185</td></tr><tr style = \"color:red;\"><td>小青</td><td>21</td><td>170</td></tr></table></div>";                webBrowser = new WebBrowser();//是否显式滚动条webBrowser.ScrollBarsEnabled = false;//加载 htmlwebBrowser.DocumentText = html;            //页面加载完成执行事件webBrowser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser_DocumentCompleted);          }private void webBrowser_DocumentCompleted(object sender, EventArgs e)//这个就是当网页载入完毕后要进行的操作        {//获取解析后HTML的大小System.Drawing.Rectangle rectangle = webBrowser.Document.Body.ScrollRectangle;int width = rectangle.Width;int height = rectangle.Height;//设置解析后HTML的可视区域webBrowser.Width = width;              webBrowser.Height = height;                Bitmap bitmap = new System.Drawing.Bitmap(width, height);              webBrowser.DrawToBitmap(bitmap, new System.Drawing.Rectangle(0, 0, width, height));//设置图片文件保存路径和图片格式，格式可以自定义string filePath = AppDomain.CurrentDomain.BaseDirectory + "../../SaveFIle/" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".png";              bitmap.Save(filePath, System.Drawing.Imaging.ImageFormat.Png);//创建PDFFileStream fileStream = new FileStream(AppDomain.CurrentDomain.BaseDirectory + "../../SaveFIle/" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".pdf", FileMode.Create);byte[] result = CreatePDF(bitmap, width, height);                fileStream.Write(result, 0, result.Length);                fileStream.Close();              fileStream.Dispose();          }private void button1_Click(object sender, EventArgs e)          {              ConvertToImg();          }public byte[] CreatePDF(Bitmap bitmap, int width, int height)          {using (MemoryStream ms = new MemoryStream())              {                  Document doc = new Document(new iTextSharp.text.Rectangle(0, 0, width, height), 3, 3, 3, 3);    // 左右上下PdfWriter writer = PdfWriter.GetInstance(doc, ms);                    writer.CloseStream = false;                    doc.Open();                    iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(bitmap, System.Drawing.Imaging.ImageFormat.Png);                    img.ScalePercent(100);      // 放缩比例doc.Add(img);       // 添加图片对像                doc.Close();return ms.ToArray();              }          }      }

public partial class Form1 : Form      {public Form1()          {              InitializeComponent();          }public void ConvertToPDF()          {string html = "<div><table border = \"1\" cellspacing = \"0\" cellpadding = \"3\" style = \"text-align:center;\"><tr><th style = \"width:60px;\">字段1</th><th style = \"width:60px;\">字段2</th><th style = \"width:60px;\">字段3</th></tr><tr style = \"color:green;\"><td>小明</td><td>22</td><td>185</td></tr><tr style = \"color:red;\"><td>小青</td><td>21</td><td>170</td></tr></table></div>";//创建一个Doc对象Doc doc = new Doc();//Rect默认是文档整个页面大小,这里的Inset表示将Rect左右留出15的空白,上下留出20的空白doc.Rect.Inset(15, 20);//直接设置htmlint docID = doc.AddHtml(html);//设置URL//int docID = doc.AddImageUrl("");//设置字体doc.AddFont("Arial");while (true)              {//判断是否还有内容if (!doc.Chainable(docID))                  {break;                  }//如果还有内容就添加一页doc.Page = doc.AddPage();//根据ID添加内容并返回页面上该内容对应的新IDdocID = doc.AddImageToChain(docID);              }string filePath = AppDomain.CurrentDomain.BaseDirectory + "../../SaveFIle/" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".pdf";                doc.Save(filePath);                doc.Clear();              doc.Dispose();          }private void button1_Click(object sender, EventArgs e)          {              ConvertToPDF();          }                }