PowerPoint Paragraph Formatting in C# and VB.NET
When building presentations, formatting paragraphs is essential for better visibility and readability. All the textual content in paragraphs can be inserted in text boxes or even shapes.
GemBox.Presentation supports TextParagraphFormat
options like alignment, indentation, spacing and many others. You can use it to edit your presentations programmatically in C# and VB.NET.
The following example shows some of the available paragraph-formatting options and how to insert them into your PowerPoint files.

using GemBox.Presentation;
class Program
{
static void Main()
{
// If using the Professional version, put your serial key below.
ComponentInfo.SetLicense("FREE-LIMITED-KEY");
var presentation = new PresentationDocument();
// Create new slide.
var slide = presentation.Slides.AddNew(SlideLayoutType.Custom);
// Create new text box.
var textBox = slide.Content.AddTextBox(
ShapeGeometryType.RoundedRectangle, 2, 2, 10, 4, LengthUnit.Centimeter);
// Create new paragraph.
var paragraph = textBox.AddParagraph();
// Set paragraph text.
paragraph.AddRun("This paragraph has the following properties: alignment is justify, after spacing is 100% of the text size, before spacing is 250% of the text size, line spacing is 200% of the text size.");
// Set selected paragraph format.
var format = paragraph.Format;
format.Alignment = HorizontalAlignment.Justify;
format.SpacingAfter = TextSpacing.Single;
format.SpacingBefore = TextSpacing.Multiple(2.5);
format.SpacingLine = TextSpacing.Double;
// Create new paragraph.
paragraph = textBox.AddParagraph();
// Set paragraph text.
paragraph.AddRun("This paragraph has the following properties: alignment is left, indentation before text is 15 points and first line indentation is 25 points.");
// Set selected paragraph format.
paragraph.Format.Alignment = HorizontalAlignment.Left;
paragraph.Format.IndentationBeforeText = Length.From(15, LengthUnit.Point);
paragraph.Format.IndentationSpecial = Length.From(25, LengthUnit.Point);
presentation.Save("Paragraph Formatting.%OutputFileType%");
}
}
Imports GemBox.Presentation
Module Program
Sub Main()
' If using the Professional version, put your serial key below.
ComponentInfo.SetLicense("FREE-LIMITED-KEY")
Dim presentation = New PresentationDocument
' Create New slide.
Dim slide = presentation.Slides.AddNew(SlideLayoutType.Custom)
' Create New text box.
Dim textBox = slide.Content.AddTextBox(
ShapeGeometryType.RoundedRectangle, 2, 2, 10, 4, LengthUnit.Centimeter)
' Create New paragraph.
Dim paragraph = textBox.AddParagraph()
' Set paragraph text.
paragraph.AddRun("This paragraph has the following properties: alignment is justify, after spacing is 100% of the text size, before spacing is 250% of the text size, line spacing is 200% of the text size.")
' Set selected paragraph format.
Dim format = paragraph.Format
format.Alignment = HorizontalAlignment.Justify
format.SpacingAfter = TextSpacing.Single
format.SpacingBefore = TextSpacing.Multiple(2.5)
format.SpacingLine = TextSpacing.Double
' Create New paragraph.
paragraph = textBox.AddParagraph()
' Set paragraph text.
paragraph.AddRun("This paragraph has the following properties: alignment is left, indentation before text is 15 points and first line indentation is 25 points.")
' Set selected paragraph format.
paragraph.Format.Alignment = HorizontalAlignment.Left
paragraph.Format.IndentationBeforeText = Length.From(15, LengthUnit.Point)
paragraph.Format.IndentationSpecial = Length.From(25, LengthUnit.Point)
presentation.Save("Paragraph Formatting.%OutputFileType%")
End Sub
End Module
See also
Next steps
Published: December 13, 2018 | Modified: December 19, 2022 | Author: Damir Stipinovic