SignatureField
Overview
SignatureField is a class in Aspose.PDF FOSS for .NET.
Inherits from: Field.
SignatureField.Sign(signature) applies a digital signature to a form field, and Flatten() can make the signature appearance permanent in the document.
This class provides 27 methods for working with SignatureField objects in .NET programs.
Available methods include: Accept, ChangeAfterResize, Clone, CopyTo, ExecuteFieldJavaScript, ExportToJson, ExportValueToJson, ExtractCertificate, ExtractCertificateObject, ExtractImage, Field, Flatten, and 12 additional methods.
All public members are accessible to any .NET application after installing the Aspose.PDF FOSS for .NET package.
Properties: Action, Actions, ActiveState, Alignment, AlternateName, AnnotationFlags, and 73 more.
Properties
| Name | Type | Access | Description |
|---|---|---|---|
SignedBytes | byte[]? | Read | Returns the latest signed bytes, or null when this field hasn’t been signed via Sign(Signature). |
Signature | Signature? | Read | Information about the digital signature in this field. |
Type | FieldType | Read | The field type. |
FullName | string? | Read | The fully qualified field name. |
Name | string? | Read/Write | The fully qualified field name (alias for FullName). |
TextHorizontalAlignment | Aspose.Pdf.HorizontalAlignment | Read/Write | Text-specific horizontal alignment override applied to the field’s widget appearance. |
PageIndex | int | Read | 1-based index of the page that owns this field’s widget. |
PartialName | string? | Read/Write | The partial field name (/T). |
NormalAppearance | XForm? | Read | The field’s “Normal” appearance (the /AP /N entry). |
Appearance | Aspose.Pdf.Annotations.AppearanceDictionary | Read | The field widget’s appearance streams (the /AP entry), keyed by appearance name. |
OnActivated | Annotations.PdfAction? | Read/Write | The action triggered when this field is activated (/A entry). |
Value | string? | Read/Write | The field value (/V). |
Count | int | Read | Number of kids in this field’s /Kids array — either child fields (hierarchy nodes) or widget annotations (a terminal field with multiple visual widgets, such as a grouped checkbox/radio). |
Fields | Field[] | Read | Field-typed child kids of this field as a snapshot array — convenience accessor mirroring Fields on the form. |
DefaultValue | string? | Read | The default value (/DV). |
AlternateName | string? | Read/Write | The alternate field name / tooltip (/TU entry). |
Flags | Aspose.Pdf.Annotations.AnnotationFlags | Read/Write | The widget annotation flags (/F entry), e.g. |
TabOrder | int | Read/Write | Tab order index for this field. |
IsReadOnly | bool | Read | Whether the field is read-only. |
ReadOnly | bool | Read/Write | Whether the field is read-only (settable alias for API parity). |
IsRequired | bool | Read | Whether the field is required. |
Characteristics | Aspose.Pdf.Annotations.Characteristics | Read | Appearance characteristics (border / background colors, widget rotation). |
DefaultAppearance | Aspose.Pdf.Annotations.DefaultAppearance | Read/Write | Default appearance (font, size, colour) of the field — per published reference on WidgetAnnotation. |
Rect | Rectangle? | Read/Write | The field rectangle. |
Border | Border? | Read/Write | The field border. |
Color | Color | Read/Write | The field color (stored in /DA default appearance string as RGB). |
AnnotationIndex | int | Read/Write | 1-based index of the widget annotation used by AcroForm rendering when the field has multiple widgets. |
FitIntoRectangle | bool | Read/Write | Global flag: when true, a field’s value is auto-resized to fit its widget rectangle. |
IsGroup | bool | Read | Whether this field is a container/group of child fields. |
IsSharedField | bool | Read/Write | Whether this field belongs to a shared-fields group. |
IsSynchronized | bool | Read | Whether the collection is thread-safe. |
SyncRoot | object | Read | Synchronization root; returns this instance. |
MaxFontSize | double | Read/Write | Maximum font size used by the field’s appearance auto-fit. |
MinFontSize | double | Read/Write | Minimum font size used by the field’s appearance auto-fit. |
MappingName | string? | Read/Write | Mapping name used by external scripts to identify the field. |
AnnotationType | AnnotationType | Read | Always Widget. |
Actions | AnnotationActionCollection | Read | Action slots for the widget’s /AA tree. |
Exportable | bool | Read/Write | Whether the widget’s value should be exported on form submit. |
Highlighting | HighlightingMode | Read/Write | Visual highlighting mode used when the user clicks the widget (/H entry). |
Parent | Forms.Field? | Read | Parent Field when this widget is the visual child of an AcroForm field. |
Required | bool | Read/Write | Whether the widget must be filled before submit (/Ff bit 2). |
HighlightMode | string | Read | The highlight mode (/H entry). |
DefaultAppearanceString | string? | Read | The default appearance string (/DA entry). |
FieldValue | string? | Read | The field value (/V entry). |
DefaultFieldValue | string? | Read | The default field value (/DV entry). |
FieldType | string? | Read | The field type (/FT entry). |
Width | double | Read/Write | The width of the annotation rectangle. |
Height | double | Read/Write | The height of the annotation rectangle. |
ActiveState | string? | Read/Write | Currently-active appearance state (/AS entry). |
Alignment | TextAlignment | Read/Write | Text alignment (for free-text / widget annotations carrying rich text). |
HorizontalAlignment | Aspose.Pdf.HorizontalAlignment | Read/Write | Horizontal alignment, exposed in addition to Alignment; the two are independently settable. |
States | AppearanceDictionary | Read | Appearance-state dictionary (the per-state sub-dict of AP/N, e.g. |
UpdateAppearanceOnConvert | bool | Read/Write | Whether to regenerate the appearance stream when the annotation is saved into a converted document. |
UseFontSubset | bool | Read/Write | Whether the embedded font (if any) should be subsetted. |
Contents | string? | Read/Write | The annotation contents (text). |
Opacity | double | Read/Write | Annotation opacity (0.0 = transparent, 1.0 = opaque). |
InteriorColor | Color? | Read/Write | The annotation interior color (/IC entry, for circle/square/line annotations). |
Title | string? | Read/Write | The annotation title (author for markup annotations). |
Subject | string? | Read/Write | The annotation subject (/Subj entry). |
ModifiedDate | string? | Read | The modification date. |
Modified | DateTime | Read/Write | The /M (modified) date as a typed DateTime. |
AnnotationFlags | AnnotationFlags | Read/Write | Typed alias of Flags exposing AnnotationFlags as a property. |
Action | PdfAction? | Read/Write | The action associated with this annotation (/A entry). |
Author | string? | Read | The annotation author (/T entry). |
AnnotationState | string? | Read | The annotation state (/State entry), e.g. |
AnnotationStateModel | string? | Read | The annotation state model (/StateModel entry), e.g. |
ReplyType | string? | Read | The reply type (/RT entry), e.g. |
InReplyTo | Annotation? | Read/Write | The annotation this one is replying to (/IRT entry). |
QuadPoints | Point[] | Read/Write | QuadPoints as an array of Point values. |
Page | Page? | Read | The page that owns this annotation, or null when it can’t be resolved (e.g. |
VerticalAlignment | VerticalAlignment | Read/Write | Vertical alignment applied to this paragraph. |
Margin | MarginInfo? | Read/Write | Outer-margin info applied to this paragraph. |
IsFirstParagraphInColumn | bool | Read/Write | Force the paragraph to start a new column. |
IsKeptWithNext | bool | Read/Write | Keep this paragraph on the same page as the next one. |
IsInNewPage | bool | Read/Write | Force the paragraph to start on a new page. |
IsInLineParagraph | bool | Read/Write | Inline paragraph flag (does not start a new line). |
HyperlinkText | string? | Read/Write | Legacy string-typed hyperlink target. |
Hyperlink | Hyperlink? | Read/Write | Typed hyperlink decoration applied to the paragraph. |
ZIndex | int | Read/Write | Z-order index used by the DOM renderer. |
Methods
| Signature | Description |
|---|---|
SignatureField(doc: Document, rect: Rectangle) | Create an empty signature field on doc’s first page sized to rect. |
SignatureField(page: Page, rect: Rectangle) | Create an empty signature field on page sized to rect. |
Sign(signature: Signature) | Sign this field with the supplied signature’s embedded certificate. |
Sign(signature: Signature, pfx: Stream, pass: string) | Sign with a PFX from a stream + password — convenience over Sign(Signature). |
ExtractCertificate() | Extract the signing certificate of this field’s /V as a DER byte stream (.cer). |
ExtractCertificateObject() | Extract the signing certificate as an X509Certificate2. |
ExtractImage() | Extract the visible-signature appearance (the /AP /N stream) as a Stream. |
ExtractImage(format: System.Drawing.Imaging.ImageFormat) | Extract the visible-signature appearance and re-encode it as format. |
Field(doc: Document) | Create a field bound to a document. |
GetEnumerator() | Iterates widget annotations for this field’s kids in the /Kids array. |
CopyTo(array: Aspose.Pdf.Annotations.WidgetAnnotation[], index: int) | Copy widget annotations into an array starting at index. |
ExecuteFieldJavaScript(javaScriptAction: Aspose.Pdf.Annotations.JavascriptAction) | Execute the supplied JavaScript action against this field. |
ExportToJson(stream: Stream) | Serialise this field to JSON (a single FieldExportingData object) via the supplied stream. |
ExportValueToJson(outputJsonStream: Stream, indented: bool) | Write the field’s name, flags and value to a JSON stream. |
Flatten() | Flatten this field — turn its value into static page content. |
GetWidgetEnumerator() | Enumerator typed to WidgetAnnotation. |
ImportValueFromJson(inputJsonStream: Stream) | Read this field’s value from a JSON stream. |
Recalculate() | Recalculate the field’s value from its calculation script. |
SetPosition(point: Aspose.Pdf.Point) | Move the field’s first widget rectangle to the supplied point (top-left corner). |
WidgetAnnotation(doc: Document) | Programmatic ctor — creates a bare widget annotation associated with doc’s reader. |
GetCheckedStateName() | Returns the appearance state name that represents the “on” / “checked” state of this widget (typically “Yes”), looked up from the /AP/N dict’s keys (anything that isn’t “Off”). |
Accept(visitor: AnnotationSelector) | Calls Accept on this SignatureField instance. |
GetRectangle(considerRotation: bool) | Bounding rectangle adjusted by considerRotation. |
ChangeAfterResize(transform: Matrix) | Adjust the annotation’s geometry after the user resized the page or the host rectangle. |
UpdateAppearances() | Regenerate the normal appearance stream (/AP /N) from the annotation’s current geometry and colours. |
WriteXfdf(writer: System.Xml.XmlWriter) | Serialize this annotation as an XFDF element to writer (PDF 32000 §12.7.8 / XFDF 3.0). |
Clone() | Shallow clone — copies scalar/ref-shared state. |