Import annotations as objects in Blazor SfPdfViewer Component

21 Jun 20231 minute to read

The Syncfusion’s Blazor SfPdfViewer component allows to import annotations from objects or streams instead of loading it as a file. To import such annotation objects, the SfPdfViewer control must export the PDF annotations as objects using the ExportAnnotationsAsObjectAsync() method. Only the annotations objects that are exported from the SfPdfViewer can be imported.

The following code example shows how to import annotations as objects, that are exported using the ExportAnnotationsAsObjectAsync() method.

@page "/"
@using Syncfusion.Blazor.SfPdfViewer

<button @onclick="ExportAnnot">ExportAnnot</button>
<button @onclick="ImportAnnot">ImportAnnot</button>

<SfPdfViewer2 @ref="PdfViewer"
              DocumentPath="@DocumentPath"
              Height="100%"
              Width="100%">
</SfPdfViewer2>

@code {
    public SfPdfViewer2 PdfViewer { get; set; }
    private string DocumentPath { get; set; } = "PDF_Succinctly.pdf";
    public object annotation;

    //Export the annotations as an object
    public async void ExportAnnot()
    {
        await PdfViewer.ExportAnnotation();
        annotation = await PdfViewer.ExportAnnotationsAsObjectAsync();
    }

    //Import the annotations that are exported as objects
    public async void ImportAnnot()
    {
        await PdfViewer.ImportAnnotation(annotation);
    }
}

View sample in GitHub.

NOTE

You can refer to our Blazor SfPdfViewer feature tour page for its groundbreaking feature representations. You can also explore our Blazor SfPdfViewer example to understand how to explains core features of SfPdfViewer.

Import annotations as objects in Blazor SfPdfViewer Component

See also