Advanced search for Metadata signatures Leave feedback
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.
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}");
}
}
You may easily run the code above and see the feature in action in our GitHub examples:
- GroupDocs.Signature for .NET examples, plugins, and showcase
- GroupDocs.Signature for Java examples, plugins, and showcase
- Document Signature for .NET MVC UI Example
- Document Signature for .NET App WebForms UI Example
- Document Signature for Java App Dropwizard UI Example
- Document Signature for Java Spring UI Example
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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