C# 使用 iTextSharp，如何右对齐文本容器（但保持各行左对齐）

With iTextSharp, how to rightalign a container of text (but keeping the individual lines leftaligned)

提问by T.J.Kjaer

I don't know the width of the texts in the textblock beforehand, and I want the the textblock to be aligned to the right like this, while still having the individual lines left-aligned:

我事先不知道文本块中文本的宽度，我希望文本块像这样向右对齐，同时仍然使各行左对齐：

                                Mr. Petersen      |
                                Elmstreet 9       |
                                888 Fantastic City|

(| donotes the right edge of the document)

(| 表示文档的右边缘)

It should be simple, but I can't figure it out.

它应该很简单，但我无法弄清楚。

I've tried to put all the text in a paragraph and set paragraph.Alignment = Element.ALIGN_RIGHT, but this will rightalign the individual lines.

我试图将所有文本放在一个段落中并设置paragraph.Alignment = Element.ALIGN_RIGHT，但这将使各个行右对齐。

I've tried to put the paragraph in a cell inside a table, and rightalign the cell, but the cell just takes the full width of the table.

我试图将段落放在表格内的单元格中，并右对齐单元格，但该单元格只占用表格的整个宽度。

If I could just create a container that would take only the needed width, I could simply rightalign this container, so maybe that is really my question.

如果我可以创建一个只占用所需宽度的容器，我可以简单地右对齐这个容器，所以也许这真的是我的问题。

采纳答案by kuujinbo

Just set the Paragraph.Alignproperty:

只需设置Paragraph.Align属性：

using (Document document = new Document()) {
  PdfWriter.GetInstance(
    document, STREAM
  );
  document.Open();
  for (int i = 1; i < 11; ++i) {
    Paragraph p = new Paragraph(string.Format(
      "Paragraph {0}", i
    ));
    p.Alignment = Element.ALIGN_RIGHT;
    document.Add(p);
  } 
}

It even works with a long string like this:

它甚至适用于像这样的长字符串：

string longString = @"
iText ? is a library that allows you to create and manipulate PDF documents. It enables developers looking to enhance web- and other applications with dynamic PDF document generation and/or manipulation.
";
Paragraph pLong = new Paragraph(longString);
pLong.Alignment = Element.ALIGN_RIGHT;
document.Add(pLong);

EDIT: After looking at the "picture" you drew...

编辑：看了你画的“图片”后......

It doesn't match with the title. The onlyway you can align individual Paragraphobjects like your picture is if the "paragraph" does NOTexceed the Documentobject's "content" box (for a lack of a better term). In other words, you won't be able to get that type of alignment if the amount of text exceeds that which willfit on a single line.

它与标题不符。该只可以对准个体化的道路Paragraph就像你的图片对象是如果“段落”不不超过Document对象的“内容”框（因为缺少一个更好的词）。换句话说，如果文本量超过单行可容纳的量，您将无法获得这种类型的对齐方式。

With that said, if you want that type of alignment you need to:

话虽如此，如果您想要这种类型的对齐方式，您需要：

1. Calculate the widest value from the collection of strings you intend to use.
2. Use that value to set a common left indentation value for the Paragraphs.

1. 从您打算使用的字符串集合中计算最宽的值。
2. 使用该值为Paragraphs设置一个通用的左缩进值。

Something like this:

像这样的东西：

using (Document document = new Document()) {
  PdfWriter.GetInstance(
    document, STREAM
  );
  document.Open();
  List<Chunk> chunks = new List<Chunk>();
  float widest = 0f;
  for (int i = 1; i < 5; ++i) {
    Chunk c = new Chunk(string.Format(
      "Paragraph {0}", Math.Pow(i, 24)
    ));
    float w = c.GetWidthPoint();
    if (w > widest) widest = w;
    chunks.Add(c);
  } 
  float indentation = document.PageSize.Width
    - document.RightMargin
    - document.LeftMargin
    - widest
  ;
  foreach (Chunk c in chunks) {
    Paragraph p = new Paragraph(c);
    p.IndentationLeft = indentation;
    document.Add(p);
  }
}

UPDATE 2:

更新 2：

After reading your updated question, here's another option that lets you add text to the left side of the "container":

阅读更新后的问题后，这里有另一个选项可让您在“容器”的左侧添加文本：

string textBlock = @"
Mr. Petersen
Elmstreet 9
888 Fantastic City  
".Trim();
// get the longest line to calcuate the container width  
var widest = textBlock.Split(
    new string[] {Environment.NewLine}
    , StringSplitOptions.None
  )
  .Aggregate(
    "", (x, y) => x.Length > y.Length ? x : y
  )
;
// throw-away Chunk; used to set the width of the PdfPCell containing
// the aligned text block
float w = new Chunk(widest).GetWidthPoint();
PdfPTable t = new PdfPTable(2);
float pageWidth = document.PageSize.Width 
  - document.LeftMargin 
  - document.RightMargin
;
t.SetTotalWidth(new float[]{ pageWidth - w, w });
t.LockedWidth = true;  
t.DefaultCell.Padding = 0;
// you can add text in the left PdfPCell if needed
t.AddCell("");
t.AddCell(textBlock);
document.Add(t);