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How to: Create a Package

This topic shows how to use the classes in the Open XML SDK 2.0 for Microsoft Office to programmatically create a word processing document package from content in the form of WordprocessingML XML markup.

The following assembly directives are required to compile the code in this topic.

using System.Text;
using System.IO;
using DocumentFormat.OpenXml;
using DocumentFormat.OpenXml.Packaging;

An Open XML document is stored as a package, whose format is defined by ISO/IEC 29500-2. The package can have multiple parts with relationships between them. The relationship between parts controls the category of the document. A document can be defined as a word-processing document if its package-relationship item contains a relationship to a main document part. If its package-relationship item contains a relationship to a presentation part it can be defined as a presentation document. If its package-relationship item contains a relationship to a workbook part, it is defined as a spreadsheet document. In this how-to topic, you will use a word-processing document package.

In the Open XML SDK, the WordprocessingDocument class represents a Word document package. To create a Word document, you create an instance of the WordprocessingDocument class and populate it with parts. At a minimum, the document must have a main document part that serves as a container for the main text of the document. The text is represented in the package as XML using WordprocessingML markup.

To create the class instance you call the Create(String, WordprocessingDocumentType) method. Several Create methods are provided, each with a different signature. The sample code in this topic uses the Create method with a signature that requires two parameters. The first parameter takes a full path string that represents the document that you want to create. The second parameter is a member of the WordprocessingDocumentType enumeration. This parameter represents the type of document. For example, there is a different member of the WordProcessingDocumentType enumeration for each of document, template, and the macro enabled variety of document and template.

NoteNote

Carefully select the appropriate WordProcessingDocumentType and verify that the persisted file has the correct, matching file extension. If the WordProcessingDocumentType does not match the file extension, an error occurs when you open the file in Microsoft Word. The code that calls the Create method is part of a using statement followed by a bracketed block, as shown in the following code example.

using (WordprocessingDocument wordDoc = WordprocessingDocument.Create(document, WordprocessingDocumentType.Document))
{
   // Insert other code here. 
}

The using statement provides a recommended alternative to the typical .Create, .Save, .Close sequence. It ensures that the Dispose () method (internal method used by the Open XML SDK to clean up resources) is automatically called when the closing bracket is reached. The block that follows the using statement establishes a scope for the object that is created or named in the using statement, in this case wordDoc. Because the WordprocessingDocument class in the Open XML SDK automatically saves and closes the object as part of its System.IDisposable implementation, and because Dispose is automatically called when you exit the bracketed block, you do not have to explicitly call Save and Close─as long as you use using.

Once you have created the Word document package, you can add parts to it. To add the main document part you call the AddMainDocumentPart() method of the WordprocessingDocument class. Having done that, you can set about adding the document structure and text.

The basic document structure of a WordProcessingML document consists of the document and body elements, followed by one or more block level elements such as p, which represents a paragraph. A paragraph contains one or more r elements. The r stands for run, which is a region of text with a common set of properties, such as formatting. A run contains one or more t elements. The t element contains a range of text. The WordprocessingML markup for the document that the sample code creates is shown in the following code example.

<w:document xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main">
  <w:body>
    <w:p>
      <w:r>
        <w:t>Create text in body - CreateWordprocessingDocument</w:t>
      </w:r>
    </w:p>
  </w:body>
</w:document>

Using the Open XML SDK 2.0, you can create document structure and content using strongly-typed classes that correspond to WordprocessingML elements. You can find these classes in the DocumentFormat.OpenXml.Wordprocessing namespace. The following table lists the class names of the classes that correspond to the document, body, p, r, and t elements:

WordprocessingML Element

Open XML SDK 2.0 Class

Description

document

Document

The root element for the main document part.

body

Body

The container for the block level structures such as paragraphs, tables, annotations, and others specified in the ISO/IEC 29500 specification.

p

Paragraph

A paragraph.

r

Run

A run.

t

Text

A range of text.

First, the code creates a WordprocessingDocument object that represents the package based on the name of the input document. The code then calls the AddMainDocumentPart method to create a main document part as /word/document.xml in the new package.

// To create a new package as a Word document.
public static void CreateNewWordDocument(string document)
{
    using (WordprocessingDocument wordDoc = WordprocessingDocument.Create(document, WordprocessingDocumentType.Document))
    {
        // Set the content of the document so that Word can open it.
        MainDocumentPart mainPart = wordDoc.AddMainDocumentPart();

        SetMainDocumentContent(mainPart);
    }
}

The code then calls the SetMainDocumentContent method to populate the new main document part.

// Set the content of MainDocumentPart.
public static void SetMainDocumentContent(MainDocumentPart part)
{
    const string docXml =
     @"<?xml version=""1.0"" encoding=""UTF-8"" standalone=""yes""?> 
<w:document xmlns:w=""http://schemas.openxmlformats.org/wordprocessingml/2006/main"">
<w:body>
    <w:p>
        <w:r>
            <w:t>Hello world!</w:t>
        </w:r>
    </w:p>
</w:body>
</w:document>";

    using (Stream stream = part.GetStream())
    {
        byte[] buf = (new UTF8Encoding()).GetBytes(docXml);
        stream.Write(buf, 0, buf.Length);
    }
}

The following is the complete code sample that you can use to create an Open XML word processing document package from XML content in the form of WordprocessingML markup. In your program, you can invoke the method CreateNewWordDocument by using the following call:

CreateNewWordDocument(@"C:\Users\Public\Documents\MyPkg4.docx");

After you run the program, open the created file “myPkg4.docx” and examine its content; it should be one paragraph that contains the phrase “Hello world!”

Following is the complete sample code in both C# and Visual Basic.

// To create a new package as a Word document.
public static void CreateNewWordDocument(string document)
{
   using (WordprocessingDocument wordDoc = WordprocessingDocument.Create(document, WordprocessingDocumentType.Document))
   {
      // Set the content of the document so that Word can open it.
      MainDocumentPart mainPart = wordDoc.AddMainDocumentPart();

      SetMainDocumentContent(mainPart);
   }
}

// Set the content of MainDocumentPart.
public static void SetMainDocumentContent(MainDocumentPart part)
{
   const string docXml =
    @"<?xml version=""1.0"" encoding=""UTF-8"" standalone=""yes""?> 
    <w:document xmlns:w=""http://schemas.openxmlformats.org/wordprocessingml/2006/main"">
        <w:body>
            <w:p>
                <w:r>
                    <w:t>Hello world!</w:t>
                </w:r>
            </w:p>
        </w:body>
    </w:document>";

    using (Stream stream = part.GetStream())
    {
        byte[] buf = (new UTF8Encoding()).GetBytes(docXml);
        stream.Write(buf, 0, buf.Length);
    }
}

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