[英]Render User Controls and call their Page_Load
由於控件(第1頁,第2頁,第3頁)要求調用其“ Page_Load”事件,因此以下代碼將不起作用。
using System;
using System.IO;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using iTextSharp.text;
using iTextSharp.text.html.simpleparser;
using iTextSharp.text.pdf;
public partial class utilities_getPDF : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
// add user controls to the page
AddContentControl("controls/page1");
AddContentControl("controls/page2");
AddContentControl("controls/page3");
// set up the response to download the rendered PDF...
Response.ContentType = "application/pdf";
Response.ContentEncoding = System.Text.Encoding.UTF8;
Response.AddHeader("Content-Disposition", "attachment;filename=FileName.pdf");
Response.Cache.SetCacheability(HttpCacheability.NoCache);
// get the rendered HTML of the page
System.IO.StringWriter stringWrite = new StringWriter();
System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
this.Render(htmlWrite);
StringReader reader = new StringReader(stringWrite.ToString());
// write the PDF to the OutputStream...
Document doc = new Document(PageSize.A4);
HTMLWorker parser = new HTMLWorker(doc);
PdfWriter.GetInstance(doc, Response.OutputStream);
doc.Open();
parser.Parse(reader);
doc.Close();
}
// the parts are probably irrelevant to the question...
private const string contentPage = "~/includes/{0}.ascx";
private void AddContentControl(string page)
{
content.Controls.Add(myLoadControl(page));
}
private Control myLoadControl(string page)
{
return TemplateControl.LoadControl(string.Format(contentPage, page));
}
}
所以我的問題是:
如何獲得HTML控件?
首先,要使動態添加的控件參與頁面生命周期,您需要在頁面PreInit事件中創建它們。 請參見ASP.NET頁面生命周期
然后,要獲取完整的HTML,請確保已處理所有頁面事件,您可以重寫頁面Render方法,如下所示:
using System;
using System.IO;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using iTextSharp.text;
using iTextSharp.text.html.simpleparser;
using iTextSharp.text.pdf;
public partial class utilities_getPDF : System.Web.UI.Page
{
protected void Page_PreInit(object sender, EventArgs e)
{
// add user controls to the page
AddContentControl("controls/page1");
AddContentControl("controls/page2");
AddContentControl("controls/page3");
}
// the parts are probably irrelevant to the question...
private const string contentPage = "~/includes/{0}.ascx";
private void AddContentControl(string page)
{
content.Controls.Add(myLoadControl(page));
}
private Control myLoadControl(string page)
{
return TemplateControl.LoadControl(string.Format(contentPage, page));
}
protected override void Render(HtmlTextWriter writer)
{
//ignore asp.net writer and use your own.
//base.Render(writer);
// set up the response to download the rendered PDF...
Response.ContentType = "application/pdf";
Response.ContentEncoding = System.Text.Encoding.UTF8;
Response.AddHeader("Content-Disposition", "attachment;filename=FileName.pdf");
Response.Cache.SetCacheability(HttpCacheability.NoCache);
// get the rendered HTML of the page
System.IO.StringWriter stringWrite = new StringWriter();
System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
base.Render(htmlWrite);
htmlWrite.Flush();
htmlWrite.Close();
StringReader reader = new StringReader(stringWrite.ToString());
System.IO.MemoryStream stream = new MemoryStream();
// write the PDF to the OutputStream...
Document doc = new Document(PageSize.A4);
HTMLWorker parser = new HTMLWorker(doc);
PdfWriter.GetInstance(doc, stream);
doc.Open();
parser.Parse(reader);
doc.Close();
//binary write your pdf file
Response.Clear();
Response.BinaryWrite(stream.GetBuffer());
Response.End();
}
}
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