What implements IFormFieldAnnotationObject in IronPDF?

Concrete implementors of IFormFieldAnnotationObject in IronPDF include CheckboxFormField, ComboboxFormField, FormFieldAnnotation, ImageFormField, RadioFormField. Code that accepts IFormFieldAnnotationObject works uniformly across all implementors, with a cast to the concrete type only required when type-specific behavior is needed.

How do you use IFormFieldAnnotationObject in C# code?

Accept IFormFieldAnnotationObject as a parameter or return type in C# code that needs to work uniformly across IronPDF implementors. The interface defines the contract; concrete behavior is provided by the implementor returned at runtime.

What is the difference between IFormFieldAnnotationObject and a concrete implementor?

IFormFieldAnnotationObject is the interface contract; its concrete implementors carry the actual behavior. Reference IFormFieldAnnotationObject when writing code that should work across multiple implementors; use a concrete type when a single implementor's behavior is required.

Where is IFormFieldAnnotationObject located in the IronPDF object model?

IFormFieldAnnotationObject is in the IronSoftware.Forms namespace, shipped in IronPdf.dll. It extends IPdfDocumentObject. Concrete classes such as CheckboxFormField, ComboboxFormField implement it.

Interface IFormFieldAnnotationObject

Refers to an annotation or is an annotation

Inherited Members

IPdfDocumentObject.Client

Namespace: IronSoftware.Forms

Assembly: IronPdf.dll

Syntax

public interface IFormFieldAnnotationObject : IPdfDocumentObject

Use IFormFieldAnnotationObject in IronPDF when C# code works with PDF forms across implementors. It represents refers to an annotation or is an annotation, so code can work with PDF forms uniformly across implementors rather than binding to a concrete type.

Concrete implementors include CheckboxFormField, ComboboxFormField, FormFieldAnnotation. Code that accepts IFormFieldAnnotationObject works uniformly across these implementors, so applications can read or configure C# PDF features without binding to a specific concrete type.

Most of the usable surface is inherited. The members that carry everyday use of this contract are Client, Height, Width, X; consult these first when implementing or consuming IFormFieldAnnotationObject.

using IronPdf;

// IFormFieldAnnotationObject is consumed as the API surface for the family of implementors
void Consume(IFormFieldAnnotationObject target)
{
    // Use members defined on the interface; concrete behavior follows the implementor
}

For collection-wide operations and end-to-end examples, see the IronPDF C# documentation for related guides. For collection-wide operations on IFormFieldAnnotationObject instances, the IronPDF C# documentation lists the relevant container types and their methods. Concrete behavior depends on which implementor of IFormFieldAnnotationObject is returned at runtime; consult the specific class reference for type-specific members. Polymorphic access through IFormFieldAnnotationObject lets code work uniformly across the family of implementors, with a cast required only when type-specific behavior is needed. The reference tables below list the full set of members defined on IFormFieldAnnotationObject along with any inherited members exposed through the contract. In a typical IronPDF C# workflow, IFormFieldAnnotationObject appears as a parameter or return type at the boundary between the application and the IronPDF API. See the methods table below for the complete set of members defined directly on IFormFieldAnnotationObject. Implementing IFormFieldAnnotationObject directly in application code is uncommon; the typical pattern is to consume instances returned from the IronPDF API. When iterating over a collection of IFormFieldAnnotationObject instances, prefer the inherited members for portable code; downcast only when type-specific behavior is required.

Properties

Height

Annotation height

Declaration

double Height { get; set; }

Property Value

Type	Description
System.Double

Width

Annotation width

Declaration

double Width { get; set; }

Property Value

Type	Description
System.Double

X

Annotation X position

Declaration

double X { get; set; }

Property Value

Type	Description
System.Double

Y

Annotation y position

Declaration

double Y { get; set; }

Property Value

Type	Description
System.Double

Inherited members

Client