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iTextSharp,

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Guidance,

Samples

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iTextSharp in Action.zip （4个子文件）

itextsharp-all-5.1.3.zip 4.36MB

iTextSharp in Action.pdf 933KB

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PdfGenerator_VB.zip 1.28MB

Create PDFs in ASP.NET - getting

started with iTextSharp

The .NET framework does not contain any native way to work with PDF files. So, if you

want to generate or work with PDF files as part of your ASP.NET web application, you will

have to rely on one of the many third party components that are available. Google will

help you to find one that fits your budget, as well as a range of open-source free

components. One of the free components is iTextSharp, which is a port of a well known

Java utility, iText.

The main problem with iTextSharp is that it lacks documentation. There are some basic tutorials

available, but most programmers have to resort to trying to wrestle with the documentation

provided for the Java version - iText - to get going with the component, or you may want to

purchase the book iText In Action. However, this only provides guidance in Java. Many of the code

samples are transferable to C# without a lot of modification, but if you are relatively new to C#, you

may frequently become frustrated with undocumented or inexplicable differences in classes and

method names between the two versions. As a final resort, you can always use Reflector to pick the

dll apart and examine its innards. So, as part of a series of How To articles, here's how to get started

using iTextSharp with code samples in C#.

First thing to do is to download the component from here. You will be presented with a .zip file

containing itextsharp.dll. Unzip this, and save it somewhere on your machine. Now create a new

Web Site from within Visual Studio or Visual Web Developer. Make sure that you have added the

Bin folder from the options in the Add ASP.NET Folder option. Right-click on the Bin folder and

select Add Reference. The dialogue box should appear. Choose the Browse tab, and locate the dll

you saved earlier.

Then select it and click "OK". That's it. The dll will be copied to your Bin directory, and is now

available to the web site or project.

I have also added a folder called PDFs in which I plan to store my generated files. To avoid typing

full references to the dll, it is best to add a couple of using statements to the default ones in your

code-behind:

using iTextSharp.text;

using iTextSharp.text.pdf;

You will also want to reference System.IO, as you will be creating, opening and closing files, and

classes in this namespace are required.

The principal object within iTextSharp is the Document object. You need to create an instance of

this to be able to work with your PDF in memory. So, the first thing to do is to instantiate one:

var doc1 = new Document();

This creates a PDF document object in memory with the default settings. The size of the document

by default is A4 (which measures 210mm x 297mm, or 8.26 inches x 11.69 inches). Margins are set at

half an inch all round. The next thing to do is to commit the document to disk. The

iTextSharp.text.pdf.PdfWriter class is required for this:

//use a variable to let my code fit across the page...

string path = Server.MapPath("PDFs");

PdfWriter.GetInstance(doc1, new FileStream(path + "/Doc1.pdf",

FileMode.Create));

Now to begin actually working with the document, open it, and add a new paragraph, then close it:

doc1.Open();

doc1.Add(new Paragraph("My first PDF"));

doc1.Close();

That's it! If you refresh the PDFs folder in your web site, you will see that a new item - Doc1.pdf - has

been added, and opening it will reveal your success.

It may be, however, that you don't want to always create a PDF with the default size and margins, so

iTextSharp provides ways for you to customise these settings. There are 2 further constructors to

the Document object:

public Document(iTextSharp.text.Rectangle pageSize);

public Document(iTextSharp.text.Rectangle pageSize, float, float, float, float);

The first one can be used like this:

var doc = new Document(PageSize.A5);

The PageSize class contains a number of Rectangle objects representing the most common

paper sizes from A0 to A10, B0 to B10, LEGAL, LEDGER, LETTER, POSTCARD, TABLOID and so on. If

you want to apply a custom size that isn't available within the PageSize class, you define your own

Rectangle object, set its properties and pass that into the constructor as an argument:

var doc = new Document(new Rectangle(100f, 300f));

PdfWriter.GetInstance(doc, new FileStream(path + "/Doc2.pdf",

FileMode.Create));

doc.Open();

doc.Add(new Paragraph("This is a custom size"));

doc.Close();

In this case, a PDF document was created with the width being 100 points, and the height set at 300

points. There are 72 points to an inch, so this particular document isn't very large. It's in fact 1.39

inches x 4.17 inches. (You will probably find that as well as iTextSharp.dll, a calculator will be very

handy....).

The second constructor which takes a Rectangle object and a series of 4 float values allows you to

set your custom margins through the floats. Again, these values are measured in points. The default

half inch margins are 36 points.

If you use the PageSize class constructor, or a Rectangle directly, you can also set the background

colour of the document. This can be done using RGB colour values, or CMYK (Cyan - a kind of blue,

Magenta - a pinkish red, Yellow and "Key", or black). It used to be that if you wanted to prepare a

PDF for printing by a professional lithographic printer, you had to ensure that all colours were

CMYK, but with greater adoption of digital printing by printing companies, RGB is becoming more

acceptable. Certainly, for display on the web, RGB is preferred. To set the background colour, we

use the BackgroundColorproperty of the Rectangle object:

r.BackgroundColor = new CMYKColor(25, 90, 25, 0);

r.BackgroundColor = new Color(191, 64, 124);

Both of the above result in a rather fetching pinkish colour for the document.

iTextSharp - Working with Fonts

Following on from my introduction to iTextSharp, the free PDF utility that lets you work

with PDF files within ASP.NET, this article looks at working with fonts in PDF documents

that you create. If you haven't read the first article in this series, I recommend that you

do so now.

iTextSharp has built-in support for the 14 Type 1 fonts: Courier, Courier Bold, Courier Italic, Courier

Bold and Italic, Helvetica, Helvetica Bold, Helvetica Italic, Helvetica Bold and Italic, Times Roman,

Times Roman Bold, Times Roman Italic, Times Roman Bold and Italic, Symbol, ZapfDingBats® .

Helvetica translates more or less to Windows Arial font, while Times Roman has an equivalent in

Times New Roman. The default font is Helvetica, 12pt, black in the style typically known as Normal.

There are three principal ways to set the font to work with: one is to use the

BaseFont.CreateFont() method, the second is to use the FontFactory.GetFont() method ,

and the third is to instantiate a new Font object. BaseFont.CreateFont() is a lot more limited,

and only sets up the definition of a font. new Font() allows for propogation of font styles from one

font to the next. FontFactory.GetFont() returns a valid and new Font object that you can work

with directly. It also offers 14 overloaded constructors which gives you a lot more options to work

with. For that reason, you are most likely going to use the FontFactory.GetFont() method. But

we will get BaseFont.CreateFont() out of the way first.

BaseFont bfTimes = BaseFont.CreateFont(BaseFont.TIMES_ROMAN, BaseFont.CP1252,

false);

Font times = new Font(bfTimes, 12, Font.ITALIC, Color.RED);

The above lines create a BaseFont object and uses the built-in constant values to set the font

family and encoding. It also specifies false for embedding the font within the PDF document. this

decreases the overall size of the document, but should be set to true if you are using fonts that are

unlikely to be on the user's system, or if you plan to get the PDF printed professionally. A new Font

object is created using the BaseFont object, and further setting the font size in points, the style and

the colour - again, using iTextSharp's constants for these values. Now the font is put to use in a

paragraph:

string path = Server.MapPath("PDFs");

Document doc = new Document();

PdfWriter.GetInstance(doc, new FileStream(path + "/Font.pdf",

FileMode.Create));

doc.Open();

doc.Add(new Paragraph("This is a Red Font Test using Times Roman", times));

doc.Close();

And the result (if all goes well) is as follows:

评论收藏

内容反馈

yanghailun_

2013-04-26

可以作为参考...
wsmjq111

2013-08-10

非常好，找很久这样的教程了！
vicfre

2013-05-11

免費的東西能做到那樣已不錯了
sleep_88

2014-05-26

要是中文的就好了，内容较简洁
weiki516

2014-06-13

非常好写的非常详细虽然是英文的

前往

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Ejnstein

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