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AsnEncodedDataCollection Class
Visual Studio 2008
Represents a collection of AsnEncodedData objects. This class cannot be inherited.
Assembly: System (in System.dll)
This class implements the ICollection interface.
The following code example shows how to use the AsnEncodedDataCollection 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
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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