FileFormatInfo class

Contains data returned by FileFormatUtil document format detection methods.

To learn more, visit the Detect File Format and Check Format Compatibility documentation article.

public class FileFormatInfo


Encoding { get; }Gets the detected encoding if applicable to the current document format. At the moment detects encoding only for HTML documents.
HasDigitalSignature { get; }Returns true if this document contains a digital signature. This property merely informs that a digital signature is present on a document, but it does not specify whether the signature is valid or not.
HasMacros { get; }Returns true if this document contains a VBA macros.
IsEncrypted { get; }Returns true if the document is encrypted and requires a password to open.
LoadFormat { get; }Gets the detected document format.


You do not create instances of this class directly. Objects of this class are returned by DetectFileFormat methods.


Shows how to use the FileFormatUtil class to detect the document format and encryption.

Document doc = new Document();

// Configure a SaveOptions object to encrypt the document
// with a password when we save it, and then save the document.
OdtSaveOptions saveOptions = new OdtSaveOptions(SaveFormat.Odt);
saveOptions.Password = "MyPassword";

doc.Save(ArtifactsDir + "File.DetectDocumentEncryption.odt", saveOptions);

// Verify the file type of our document, and its encryption status.
FileFormatInfo info = FileFormatUtil.DetectFileFormat(ArtifactsDir + "File.DetectDocumentEncryption.odt");

Assert.AreEqual(".odt", FileFormatUtil.LoadFormatToExtension(info.LoadFormat));

Shows how to use the FileFormatUtil class to detect the document format and presence of digital signatures.

// Use a FileFormatInfo instance to verify that a document is not digitally signed.
FileFormatInfo info = FileFormatUtil.DetectFileFormat(MyDir + "Document.docx");

Assert.AreEqual(".docx", FileFormatUtil.LoadFormatToExtension(info.LoadFormat));

CertificateHolder certificateHolder = CertificateHolder.Create(MyDir + "morzal.pfx", "aw", null);
SignOptions signOptions = new SignOptions() { SignTime = DateTime.Now };
DigitalSignatureUtil.Sign(MyDir + "Document.docx", ArtifactsDir + "File.DetectDigitalSignatures.docx",
    certificateHolder, signOptions);

// Use a new FileFormatInstance to confirm that it is signed.
info = FileFormatUtil.DetectFileFormat(ArtifactsDir + "File.DetectDigitalSignatures.docx");


// We can load and access the signatures of a signed document in a collection like this.
Assert.AreEqual(1, DigitalSignatureUtil.LoadSignatures(ArtifactsDir + "File.DetectDigitalSignatures.docx").Count);

See Also