【译】在Asp.Net中操作PDF – iTextSharp -利用块，短语，段落添加文本

       在ASP.NET中创建PDF-iTextSharp起步

       在Asp.Net中操作PDF - iTextSharp - 使用字体

 

Chunks

      

 

块（Chunks）是容纳文本的最小容器，就像ASP.Net中的<asp:Label>一样。就像使用Label一样，对于块的使用需要小心.下面代码展示如何为块设置文本，然后将其写入PDF 3次.

 

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

 

Rectangle r = new Rectangle(400, 300);

 

Document doc = new Document(r);

 

PdfWriter.GetInstance(doc, new FileStream(path + "/Blocks.pdf", FileMode.Create));

 

doc.Open();

 

Chunk c1 = new Chunk("A chunk represents an isolated string. ");

 

for (int i = 1; i < 4; i++)

 

{

 

    doc.Add(c1);

 

}

[接下来的一段你要格外注意，我们后面还要用到]

   结果如下，可以看出文本已经被加入文档，但显示出来却是一团乱麻.Chunk并不知道文本长度何时超过文档宽度并自动换行。你可以使用”\n”或者Environment.NewLine,甚至是Chunk.NEWLINE作为给Chunk对象赋值的一部分.

   

    Chunk有一系列方法允许你为文本设置样式，比如setUnderLine(), setBackGround(), 和 setTextRise()以及一些构造函数来设置字体类型以及风格.

 

 

 

Chunk chunk = new Chunk("Setting the Font", FontFactory.GetFont("dax-black"));

chunk.SetUnderline(0.5f, -1.5f);

 

 

 

   

    

PHRASE

    Phrase是比Chunk大一级的容器,Phrase可以理解为一组Chunk,并且会在长度超过文档宽度后自动换行，每一行之间的行距（测量方法其实是每行底部之间的距离)是字体大小的1.5倍，因为在iTextSharp行距之间的举例是12pt，所以下面代码之间的行距为16pt.你可以在Phrase初始化的时候设置字体和行距.当然也可以通过其多种构造函数重载来在初始化时为Phrase添加内容.

     下面代码展示了前面3个chunk加入Phrase后展示的结果:

 

 

       Phrase phrase = new Phrase();

 

for (int i = 1; i < 4; i++)

 

{

 

      phrase.Add(c1);

 

}

 

 

   

 

Paragraphs

     目前为止，我们已经看到了如何在PDF中添加最基本的文本块.而事实上你应该用的最多的类是Paragraphs.Paragraph其实是一组有序Phrase和Chunk的集合。Paragraph派生于Phrase,所以和Phrase一样，Paragraph也会在长度超过文档长度时自动换行.不仅如此，Paragraph和Paragraph之间也会自动空一行（就像文字处理软件那样),在本文前面Chunk部分对部分文字设置格式是我们日常经常需要的，所以下面代码中，我会将格式化的文本通过Chunk和Phrase来添加到Paragraphs中:

  

 

 

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

 

Rectangle r = new Rectangle(400, 300);

 

Document doc = new Document(r);

 

 

 

try

 

{

 

    PdfWriter.GetInstance(doc, new FileStream(path + "/Blocks2.pdf", FileMode.Create));

 

    doc.Open();

 

 

 

    string text = @"The result can be seen below, which shows the text

 

                  having been written to the document but it looks a

 

                  mess. Chunks have no concept of how to force a new

 

                   line when the length exceeds the available width in

 

                  the document. Really, all they should be used for is

 

                  to change or set the style of a word or phrase inline. ";

 

    text = text.Replace(Environment.NewLine, String.Empty).Replace("  ", String.Empty);

 

    Font brown = new Font(Font.COURIER, 9f, Font.NORMAL, new Color(163, 21, 21));

 

    Font lightblue = new Font(Font.COURIER, 9f, Font.NORMAL, new Color(43, 145, 175));

 

    Font courier = new Font(Font.COURIER, 9f);

 

    Font georgia = FontFactory.GetFont("georgia", 10f);

 

    georgia.Color = Color.GRAY;

 

    Chunk beginning = new Chunk(text, georgia);

 

    Phrase p1 = new Phrase(beginning);

 

    Chunk c1 = new Chunk("You can of course force a newline using \"", georgia);

 

    Chunk c2 = new Chunk(@"\n", brown);

 

    Chunk c3 = new Chunk("\" or ", georgia);

 

    Chunk c4 = new Chunk("Environment", lightblue);

 

    Chunk c5 = new Chunk(".NewLine", courier);

 

    Chunk c6 = new Chunk(", or even ", georgia);

 

    Chunk c7 = new Chunk("Chunk", lightblue);

 

    Chunk c8 = new Chunk(".NEWLINE", courier);

 

    Chunk c9 = new Chunk(" as part of the string you give a chunk.", georgia);

 

    Phrase p2 = new Phrase();

 

    p2.

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