C#怎么将 HTML转换为图片或 PDF？
导读：收集整理的这篇文章主要介绍了C#怎么将 HTML转换为图片或 PDF？，觉得挺不错的，现在分享给大家，也给大家做个参考。首先是把 HTML 转换为图片。public partial class Form1 : Form {public...
收集整理的这篇文章主要介绍了C#怎么将 HTML转换为图片或 PDF？，觉得挺不错的，现在分享给大家，也给大家做个参考。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();
}
}
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 = \"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();
}
}
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 = \"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();
}
}
}
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 = \"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();
}
}
View Code以上就是C#怎么将 HTML转换为图片或 PDF？的详细内容，更多请关注其它相关文章！
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