// Open the new document.
Document doc = new Document();
DocumentBuilder builder = new DocumentBuilder(doc);
// Set font formatting properties
doc.Styles.Add(StyleType.Paragraph, "MyStyle");
Font font = builder.Font;
font.Bold = true;
font.Color = System.Drawing.Color.Red;
font.Italic = true;
font.Name = "Arial";
font.Size = 24;
font.Spacing = 5;
font.Underline = Underline.Double;
// Output formatted text.
builder.ParagraphFormat.Style = doc.Styles["MyStyle"];
builder.MoveToDocumentEnd();
builder.Writeln("I'm a very nice formatted string.");
doc.Save("ParagraphStyle.docx");

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public void CreateAndAddAParagraphStyleFeature()
{
using (WordprocessingDocument doc =
WordprocessingDocument.Create(ArtifactsDir + "Create and add a paragraph style - OpenXML.docx",
WordprocessingDocumentType.Document))
{
// Get the Styles part for this document.
// If the Styles part does not exist: add the styles part, and then add the style.
StyleDefinitionsPart part =
doc.MainDocumentPart.StyleDefinitionsPart ?? AddStylesPartToPackage(doc);
// Set up a variable to hold the style ID.
string parastyleId = "OverdueAmountPara";
// Create and add a paragraph style to the specified styles part 
// with the specified style ID, style name, and aliases.
AddParagraphStyle(part,
parastyleId,
"Overdue Amount Para",
"Late Due, Late Amount");
// Add a paragraph with a run and some text.
Paragraph p =
new Paragraph(
new Run(
new Text("This is some text in a run in a paragraph.")));
// Add the paragraph as a child element of the w:body element.
doc.MainDocumentPart.Document.Body.AppendChild(p);
// If the paragraph has no ParagraphProperties object, then create one.
if (!p.Elements<ParagraphProperties>().Any())
{
p.PrependChild(new ParagraphProperties());
}
// Get a reference to the ParagraphProperties object.
ParagraphProperties pPr = p.ParagraphProperties;
// If a ParagraphStyleId object doesn't exist, then create one.
if (pPr.ParagraphStyleId == null)
pPr.ParagraphStyleId = new ParagraphStyleId();
pPr.ParagraphStyleId.Val = parastyleId;
}
}
// Create a new paragraph style with the specified style ID, primary style name, and aliases.
// Add it to the specified style definitions part.
public static void AddParagraphStyle(StyleDefinitionsPart styleDefinitionsPart,
string styleid, string stylename, string aliases = "")
{
// Access the root element of the styles part.
Styles styles = styleDefinitionsPart.Styles;
if (styles == null)
{
styleDefinitionsPart.Styles = new Styles();
styleDefinitionsPart.Styles.Save();
}
// Create a new paragraph style element and specify some of the attributes.
Style style = new Style
{
Type = StyleValues.Paragraph,
StyleId = styleid,
CustomStyle = true,
Default = false
};
// Create and add the child elements (properties of the style).
Aliases aliases1 = new Aliases { Val = aliases };
AutoRedefine autoredefine1 = new AutoRedefine { Val = OnOffOnlyValues.Off };
BasedOn basedon1 = new BasedOn { Val = "Normal" };
LinkedStyle linkedStyle1 = new LinkedStyle { Val = "OverdueAmountChar" };
Locked locked1 = new Locked { Val = OnOffOnlyValues.Off };
PrimaryStyle primarystyle1 = new PrimaryStyle { Val = OnOffOnlyValues.On };
StyleHidden stylehidden1 = new StyleHidden { Val = OnOffOnlyValues.Off };
SemiHidden semihidden1 = new SemiHidden { Val = OnOffOnlyValues.Off };
StyleName styleName1 = new StyleName { Val = stylename };
NextParagraphStyle nextParagraphStyle1 = new NextParagraphStyle { Val = "Normal" };
UIPriority uipriority1 = new UIPriority { Val = 1 };
UnhideWhenUsed unhidewhenused1 = new UnhideWhenUsed { Val = OnOffOnlyValues.On };
if (aliases != "")
style.Append(aliases1);
style.Append(autoredefine1);
style.Append(basedon1);
style.Append(linkedStyle1);
style.Append(locked1);
style.Append(primarystyle1);
style.Append(stylehidden1);
style.Append(semihidden1);
style.Append(styleName1);
style.Append(nextParagraphStyle1);
style.Append(uipriority1);
style.Append(unhidewhenused1);
// Create the StyleRunProperties object and specify some of the run properties.
StyleRunProperties styleRunProperties1 = new StyleRunProperties();
Bold bold1 = new Bold();
Color color1 = new Color { ThemeColor = ThemeColorValues.Accent2 };
RunFonts font1 = new RunFonts { Ascii = "Lucida Console" };
Italic italic1 = new Italic();
// Specify a 12 point size.
FontSize fontSize1 = new FontSize { Val = "24" };
styleRunProperties1.Append(bold1);
styleRunProperties1.Append(color1);
styleRunProperties1.Append(font1);
styleRunProperties1.Append(fontSize1);
styleRunProperties1.Append(italic1);
// Add the run properties to the style.
style.Append(styleRunProperties1);
// Add the style to the styles part.
styles.Append(style);
}
// Add a StylesDefinitionsPart to the document.
public static StyleDefinitionsPart AddStylesPartToPackage(WordprocessingDocument doc)
{
Styles root = new Styles();
var part = doc.MainDocumentPart.AddNewPart<StyleDefinitionsPart>();
root.Save(part);
return part;
}

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