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  • C# 将 HTML 转换为图片或 PDF

    首先是把 HTML 转换为图片。

    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("http://www.baidu.com");
                
                //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();
            }
        }
    View Code

    上面这种方法是解析指定URL地址的HTML,然后转换为图片。当然,也可以直接写一些HTML标签。如下:

    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 = "60px;">字段1</th><th style = "60px;">字段2</th><th style = "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 html
                webBrowser.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();
            }
        }
    View Code

    然后把图片转换为PDF,这里需要用到 iTextSharp.dll 这个组件。

    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 = "60px;">字段1</th><th style = "60px;">字段2</th><th style = "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 html
                webBrowser.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PDF
                FileStream 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();
                }
            }
        }
    View Code

    不过这种生成图片之后再转成PDF,会造成像素的丢失,所以看起来要比图片模糊一点。

    还有一种办法就是直接生成PDF,这里需要安装 ABCpdf。不过,这个是收费的。。。

    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 = "60px;">字段1</th><th style = "60px;">字段2</th><th style = "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html
                int docID = doc.AddHtml(html);
    
                //设置URL
                //int docID = doc.AddImageUrl("http://www.baidu.com");
    
                //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ID
                    docID = 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();
            }
            
        }
    View Code
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  • 原文地址:https://www.cnblogs.com/Brambling/p/6926503.html
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