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(); //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();
}
}
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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 = \"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();
}
}
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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 = \"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();
}
}
}
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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 = \"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();
}
}
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以上就是c#怎么将 html转换为图片或 pdf？的详细内容。