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AsnEncodedData Constructor (Oid, Byte())

Initializes a new instance of the AsnEncodedData class using an Oid object and a byte array.

Namespace:  System.Security.Cryptography
Assembly:  System (in System.dll)

'Declaration
Public Sub New ( _
	oid As Oid, _
	rawData As Byte() _
)

Parameters

oid
Type: System.Security.Cryptography.Oid

An Oid object.

rawData
Type: System.Byte()

A byte array that contains Abstract Syntax Notation One (ASN.1)-encoded data.

The following code example shows how to use the AsnEncodedData class.

Imports System
Imports System.Security.Cryptography
Imports System.Security.Cryptography.X509Certificates



Class AsnEncodedDataSample
   Shared msg As String 
   Shared Sub Main()
      'The following example demonstrates the usage the AsnEncodedData classes. 
      ' Asn encoded data is read from the extensions of an X509 certificate. 
      Try 
         ' Open the certificate store. 
         Dim store As New X509Store("MY", StoreLocation.CurrentUser)
         store.Open((OpenFlags.ReadOnly Or OpenFlags.OpenExistingOnly))
         Dim collection As X509Certificate2Collection = CType(store.Certificates, X509Certificate2Collection)
         Dim fcollection As X509Certificate2Collection = CType(collection.Find(X509FindType.FindByTimeValid, DateTime.Now, False), X509Certificate2Collection)
         ' Select one or more certificates to display extensions information. 
         Dim scollection As X509Certificate2Collection = X509Certificate2UI.SelectFromCollection(fcollection, "Certificate Select", "Select certificates from the following list to get extension information on that certificate", X509SelectionFlag.MultiSelection)

         ' Create a new AsnEncodedDataCollection object. 
         Dim asncoll As New AsnEncodedDataCollection()
         Dim i As Integer 
         For i = 0 To scollection.Count - 1
            ' Display certificate information.
	    msg = "Certificate name: "& scollection(i).GetName()
            MsgBox(msg)

            ' Display extensions information. 
            Dim extension As X509Extension
            For Each extension In  scollection(i).Extensions
               ' Create an AsnEncodedData object using the extensions information. 
               Dim asndata As New AsnEncodedData(extension.Oid, extension.RawData)
	       msg = "Extension type: " & extension.Oid.FriendlyName & Environment.NewLine & "Oid value: " & asndata.Oid.Value _
		& Environment.NewLine & "Raw data length: " & asndata.RawData.Length & Environment.NewLine _
		& asndata.Format(True) & Environment.NewLine
               MsgBox(msg)
		
               ' Add the AsnEncodedData object to the AsnEncodedDataCollection object.
               asncoll.Add(asndata)
            Next extension
         Next i
	 msg = "Number of AsnEncodedData items in the collection: " & asncoll.Count
         MsgBox(msg)         
         store.Close()

         'Create an enumerator for moving through the collection. 
         Dim asne As AsnEncodedDataEnumerator = asncoll.GetEnumerator()
         'You must execute a MoveNext() to get to the first item in the collection.
         asne.MoveNext()
         ' Write out AsnEncodedData in the collection.
	 msg = "First AsnEncodedData in the collection: " & asne.Current.Format(True)
	 MsgBox(msg)
	

         asne.MoveNext()
	 msg = "Second AsnEncodedData in the collection: " & asne.Current.Format(True)
	 MsgBox(msg)

         'Return index in the collection to the beginning.
         asne.Reset()
      Catch 
         MsgBox("Information could not be written out for this certificate.")
      End Try 
   End Sub 'Main
End Class 'AsnEncodedDataSample

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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