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Gios PDF .NET library

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18 Apr 2005LGPL3
A .NET library for generating impressive PDF reports.

Image 1


This article describes how to use the Gios Pdf.NET open source library, a complete object-oriented .NET library for generating impressive reports with few lines of code.


I started writing this library because I really couldn’t find a good C# library for exporting my reports. When you open a PDF document with Notepad to find out if it’s possible to edit it… well… you change your mind!

...But if you download the PDF format specifications from Adobe’s official site… you can demystify everything!

In this article, it’s not my intention to teach “how to write a clone of my library” but “how to use it” … By the way, if you want to try to write your own library… try it: it’s not impossible and it's a good (and difficult!) exercise!

Using the code

Start instantiating the document with a new PdfDocument object. Remember to set the document format. In this case we specify width and height in centimeters. Document format is provided by the PdfDocumentFormat class:

PdfDocument myPdfDocument = 
  new PdfDocument(PdfDocumentFormat.InCentimeters(21,29.7));

Now we create a table of 100 lines, 6 columns and 4 points of padding:

PdfTable myPdfTable = 
  myPdfDocument.NewTable(new Font("Verdana",12),200,6,4);

Importing data from the datatables... (also column names for the headers!):


Set the format for correct date-time representation:


Now we set our Graphic Design: Colors and Borders...


With just one method, we can set the proportional width of the columns. It's a "percentage like" assignment, but the sum can be different from 100.

myPdfTable.SetColumnsWidth(new int[]{5,25,16,20,20,15});

You can also set colors for a range of cells, in this case, a row:


Now we set some alignment... for the whole table and then, for a column:


This is the most important feature of the library: each page generated by the table can be managed in all the details:

while (!myPdfTable.AllTablePagesCreated)
    // we create a new page to put the generation of the new TablePage:

    PdfPage newPdfPage=myPdfDocument.NewPage();
    PdfTablePage newPdfTablePage = 
      myPdfTable.CreateTablePage(new PdfArea(myPdfDocument,48,120,500,670));

    // we also put a Label 
    PdfTextArea pta=new PdfTextArea(new Font("Verdana",26, FontStyle.Bold), 
      Color.Red, new PdfArea(myPdfDocument,0,20,595,120), 
      ContentAlignment.MiddleCenter,"Contact List");

    // nice thing: we can put all the objects
    // in the following lines, so we can have
    // a great control of layer sequence... 


    // Now we create a loop for serching for people born in 1968. If we find
    // one, we will draw a circle over
    // the birthday cell. This is possible using the
    // the CellArea, that is the Area occupied by a rasterized Cell.
    for (int index=newPdfTablePage.FirstRow;index<=newPdfTablePage.LastRow;index++)
       if (((DateTime)myPdfTable.Rows[index][2].Content).Year==1968)
          PdfCircle pc=newPdfTablePage.CellArea(index,2).InnerCircle(Color.Blue,2);

    // we save each generated page before start rendering the next.


At last... remember to save the document!


And this is the result:

Image 2

Remember, you can also output the PDF to a generic Stream. These are the lines for a Web Response:



  • April 18, 2005 - Initial release.


This article, along with any associated source code and files, is licensed under The GNU Lesser General Public License (LGPLv3)


About the Author

Paolo Gios
Web Developer
Italy Italy
Freelance software ASPNET / C# Software Developer

I live in Torino, Italy

my homepage is:

Comments and Discussions

GeneralRe: It works! Pin
Paolo Gios18-May-05 1:53
memberPaolo Gios18-May-05 1:53 
GeneralRe: Security Exception Pin
Diego F.18-May-05 2:50
memberDiego F.18-May-05 2:50 
GeneralRe: Security Exception Pin
Diego F.19-May-05 7:01
memberDiego F.19-May-05 7:01 
GeneralRe: Finally solved! Pin
Diego F.25-May-05 22:46
memberDiego F.25-May-05 22:46 
GeneralRe: I have the same problem Pin
Mad_Force16-Jun-05 20:11
memberMad_Force16-Jun-05 20:11 
GeneralRe: I have the same problem (fixed) Pin
Mad_Force16-Jun-05 20:45
memberMad_Force16-Jun-05 20:45 
GeneralPrinting the PDF. Pin
raindog10-May-05 11:25
memberraindog10-May-05 11:25 
GeneralRe: Printing the PDF. Pin
Paolo Gios12-May-05 21:47
memberPaolo Gios12-May-05 21:47 
GeneralRe: Printing the PDF. Pin
raindog13-May-05 7:51
memberraindog13-May-05 7:51 
GeneralPreloading a PDF document template Pin
gpadilla5-May-05 9:10
membergpadilla5-May-05 9:10 
GeneralRe: Preloading a PDF document template Pin
Paolo Gios5-May-05 11:36
memberPaolo Gios5-May-05 11:36 
GeneralImages on the fly Pin
NickNuss5-May-05 8:35
memberNickNuss5-May-05 8:35 
GeneralRe: Images on the fly Pin
Paolo Gios5-May-05 11:31
memberPaolo Gios5-May-05 11:31 
GeneralRe: Images on the fly Pin
NickNuss6-May-05 13:15
memberNickNuss6-May-05 13:15 
Thank you for your response Paolo!

Well, we found a solution to our problem so I thought I would share it. This may be a hack, but it works!

Put the following virtual method in the PdfObject class so we can override it in the PdfImage class:

internal virtual void DeleteSourceFile(){}

Then, put the override method in the PdfImage class:

internal override void DeleteSourceFile()<br />
{<br />
        <br />
    this.bmp.Dispose(); <br />
    try<br />
    {<br />
        File.Delete(this.file); <br />
    }<br />
    catch (Exception err)<br />
    {<br />
        Console.WriteLine(" DeleteSourceFile: " + err.Message ); <br />
    }<br />
    <br />
    return;<br />

Put the following method in the PdfDocument class:

/// This guy deletes the original file used to create the pdfimage object.
/// Note: Make sure you save your document to a file or stream first or
/// you won't get any images in your document.

public void DeleteImageFiles()<br />
{<br />
     for (int x=1;x<=this._nextid;x++)<br />
     {<br />
	PdfObject o=this.PdfObjects[x.ToString()+" 0 obj\n"] as PdfObject;<br />
	if (o!=null)<br />
	{<br />
             try {o.DeleteSourceFile();}<br />
	     catch {throw new Exception("Error Deleting Image File.");}<br />
	}<br />
      }<br />

Since we don't really know all the ins and outs of your code, we just kind of hacked around until we found a solution. Hope this helps if anyone else is doing this same kind of thing.

Nicholas Nuss
Application Developer
GeneralRe: Images on the fly Pin
ed_rotthoff3-Jun-05 13:30
membered_rotthoff3-Jun-05 13:30 
GeneralInclude Images Pin
JK_net4-May-05 3:41
memberJK_net4-May-05 3:41 
GeneralRe: Include Images Pin
Paolo Gios4-May-05 4:10
memberPaolo Gios4-May-05 4:10 
GeneralAnother Problem please help Pin
Kelvin Ka Yiu Lok30-Apr-05 5:07
memberKelvin Ka Yiu Lok30-Apr-05 5:07 
GeneralRe: Another Problem please help Pin
anewark19-May-08 16:34
memberanewark19-May-08 16:34 
GeneralPlease help Pin
Kelvin Ka Yiu Lok30-Apr-05 5:05
memberKelvin Ka Yiu Lok30-Apr-05 5:05 
GeneralRe: Please help Pin
Diego F.12-May-05 11:34
memberDiego F.12-May-05 11:34 
Generalplease help Pin
Kelvin Ka Yiu Lok30-Apr-05 3:52
memberKelvin Ka Yiu Lok30-Apr-05 3:52 
QuestionHow to use this in VB.NET Pin
Kelvin Ka Yiu Lok29-Apr-05 2:29
memberKelvin Ka Yiu Lok29-Apr-05 2:29 
GeneralInfo Pin
Kevin Alexandre28-Apr-05 23:59
memberKevin Alexandre28-Apr-05 23:59 
GeneralRe: Info Pin
Paolo Gios29-Apr-05 0:09
memberPaolo Gios29-Apr-05 0:09 

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Posted 18 Apr 2005


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