Aspose.Pdf使用教程：為FreeTextAnnotation設置格式

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 注釋都包含在一個特定的頁面集合中,每個頁面都有自己的注釋集合。當添加FreeTextAnnotation在PDF文檔中時,我們為之設定格式。使用DefaultAppearance設置字體、大小、顏色等或使用TextStyle屬性指定格式信息。此外,我們還可以更新已經存在于現有的PDF文檔的FreeTextAnnotation的格式。

》》》下載Aspose.Pdf試用版

[TextStyle] 允許設置字體樣式、顏色和大小。

FontName (設置字體樣式)

FontSize (獲取或者設置默認字體大小)

System.Drawing.Color Color (獲取或者設置字體顏色)

TextAligment Alignment (獲取或設置注釋中的文字對齊方式)

下面是添加指定格式的FreeTextAnnotation代碼片段

C#

//open document
Document pdfDocument = new Document("c:/pdftest/TestReport.pdf");
// instantiate DefaultAppearance object
Aspose.Pdf.InteractiveFeatures.DefaultAppearance default_appearance = new DefaultAppearance("Arial", 28, System.Drawing.Color.Red);
//create annotation
FreeTextAnnotation freetext = new FreeTextAnnotation(pdfDocument.Pages[1], new Aspose.Pdf.Rectangle(200, 400, 400, 600), default_appearance);
// specify the contents of annotation
freetext.Contents = "Free Text";
// add anootation to annotations collection of page
pdfDocument.Pages[1].Annotations.Add(freetext);
// save the updated document
pdfDocument.Save("c:/pdftest/Watermarked_output_FreeText.pdf");

 VB.NET

'open document Dim pdfDocument As Document = New Document("c:/pdftest/TestReport.pdf") ' instantiate DefaultAppearance object Dim default_appearance As Aspose.Pdf.InteractiveFeatures.DefaultAppearance = New InteractiveFeatures.DefaultAppearance("Arial", 28, System.Drawing.Color.Red) 'create annotation Dim freetext As FreeTextAnnotation = New FreeTextAnnotation(pdfDocument.Pages(1), New Aspose.Pdf.Rectangle(200, 400, 400, 600), default_appearance) ' specify the contents of annotation freetext.Contents = "Free Text" ' add anootation to annotations collection of page pdfDocument.Pages(1).Annotations.Add(freetext) ' save the updated document pdfDocument.Save("c:/pdftest/Watermarked_output_FreeText.pdf") 

下面是更新已有FreeTextAnnotation格式的代碼片段

C#

Document doc1 = new Document("34471-2.pdf");
//set font size and color of the annotation:
(doc1.Pages[1].Annotations[1] as FreeTextAnnotation).TextStyle.FontSize = 18;
(doc1.Pages[1].Annotations[1] as FreeTextAnnotation).TextStyle.Color = System.Drawing.Color.Green;

VB.NET

Dim doc1 As Document = New Document("34471-2.pdf")
'set font size and color of the annotation:
CType(doc1.Pages(1).Annotations(1), FreeTextAnnotation).TextStyle.FontSize = 18
CType(doc1.Pages(1).Annotations(1), FreeTextAnnotation).TextStyle.Color = System.Drawing.Color.Green