1. GroupDocs Documentation
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    3. GroupDocs.Signature Product Family
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    5. GroupDocs.Signature for .NET
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    7. Developer Guide
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    9. Advanced usage
    10. /
    11. Searching for electronic signatures
    12. /
    13. 🌐 Metadata

    Advanced search for Metadata signatures

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    GroupDocs.Signature provides ability to search Metadata signatures and convert obtained values to various data types.

    Here are the steps to search for Metadata signature and obtain required data type with GroupDocs.Signature:

    • Create new instance of Signature class and pass source document path or stream as a constructor parameter.
    • Create objects of MetadataSearchOptions class
    • Call Search method of Signature class instance and pass MetadataSearchOptions  to it.
    • Call proper conversion method to obtain corresponding Metadata value to required data type.

    Search for electronic Metadata signature values with various data type

    This example shows how to search for Metadata signature values with various data types.

    using (Signature signature = new Signature("signed.pdf"))
{
    // search for signatures in document
    List<PdfMetadataSignature> signatures = signature.Search<PdfMetadataSignature>(SignatureType.Metadata);
    // try to get each Pdf signature with proper data type added in Basic usage example SignPdfWithMetadata
    PdfMetadataSignature mdSignature;
    // See example SignPdfWithMetadata with added various data type values to signatures
    try
    {
        mdSignature = signatures.FirstOrDefault(p => p.Name == "Author");
        Console.WriteLine($"\t[{mdSignature.Name}] as String = {mdSignature.ToString()}");
        mdSignature = signatures.FirstOrDefault(p => p.Name == "CreatedOn");
        Console.WriteLine($"\t[{mdSignature.Name}] as String = {mdSignature.ToDateTime().ToShortDateString()}");
        mdSignature = signatures.FirstOrDefault(p => p.Name == "DocumentId");
        Console.WriteLine($"\t[{mdSignature.Name}] as Integer = {mdSignature.ToInteger()}");
        mdSignature = signatures.FirstOrDefault(p => p.Name == "SignatureId");
        Console.WriteLine($"\t[{mdSignature.Name}] as Double = {mdSignature.ToDouble()}");
        mdSignature = signatures.FirstOrDefault(p => p.Name == "Amount");
        Console.WriteLine($"\t[{mdSignature.Name}] as Decimal = {mdSignature.ToDecimal()}");
        mdSignature = signatures.FirstOrDefault(p => p.Name == "Total");
        Console.WriteLine($"\t[{mdSignature.Name}] as Float = {mdSignature.ToSingle()}");
    }
    catch (Exception ex)
    {
        Helper.WriteError($"Error obtaining signature: {ex.Message}");
    }
}

    More resources

    GitHub Examples

    You may easily run the code above and see the feature in action in our GitHub examples:

    Free Online Apps

    Along with the full-featured .NET library, we provide simple but powerful free online apps.

    To sign PDF, Word, Excel, PowerPoint, and other documents you can use the online apps from the GroupDocs.Signature App Product Family.

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