framework

CryptographicException bei Verwendung von Oracle.ManagedDataAccess lösen

Gestern hatte ein Kollege beim Aufsetzen einer Website ASP.NET MVC 4 auf einem IIS unter Windows Server 2008 R2 eine Fehlermeldung:

[CryptographicException: Unbekannter Fehler -1073741766.]
   System.Security.Cryptography.ProtectedData.Protect(Byte[] userData, Byte[] optionalEntropy, DataProtectionScope scope) +504
   Oracle.ManagedDataAccess.Client.ConnectionString.Secure() +493
   OracleInternal.ConnectionPool.PoolManager`3.Initialize(ConnectionString cs) +1760
   OracleInternal.ConnectionPool.OraclePoolManager.Initialize(ConnectionString cs) +21
   OracleInternal.ConnectionPool.OracleConnectionDispenser`3.GetPM(ConnectionString cs, PM conPM, ConnectionString pmCS, Byte[] securedPassword, Byte[] securedProxyPassword, Boolean& bAuthenticated, Boolean& newPM) +296
   OracleInternal.ConnectionPool.OracleConnectionDispenser`3.Get(ConnectionString cs, PM conPM, ConnectionString pmCS, Byte[] securedPassword, Byte[] securedProxyPassword) +1576
   Oracle.ManagedDataAccess.Client.OracleConnection.Open() +3756
   OracleInternal.EntityFramework.EFOracleProviderServices.GetDbProviderManifestToken(DbConnection connection) +274
   System.Data.Common.DbProviderServices.GetProviderManifestToken(DbConnection connection) +91

[ProviderIncompatibleException: Der Anbieter hat keine ProviderManifestToken-Zeichenfolge zurückgegeben.]
   System.Data.Common.DbProviderServices.GetProviderManifestToken(DbConnection connection) +10947809
   System.Data.Entity.ModelConfiguration.Utilities.DbProviderServicesExtensions.GetProviderManifestTokenChecked(DbProviderServices providerServices, DbConnection connection) +48

[ProviderIncompatibleException: An error occurred while getting provider information from the database. This can be caused by Entity Framework using an incorrect connection string. Check the inner exceptions for details and ensure that the connection string is correct.]
   System.Data.Entity.ModelConfiguration.Utilities.DbProviderServicesExtensions.GetProviderManifestTokenChecked(DbProviderServices providerServices, DbConnection connection) +242
   System.Data.Entity.DbModelBuilder.Build(DbConnection providerConnection) +82
   System.Data.Entity.Internal.LazyInternalContext.CreateModel(LazyInternalContext internalContext) +88
   System.Data.Entity.Internal.RetryLazy`2.GetValue(TInput input) +248
   System.Data.Entity.Internal.LazyInternalContext.InitializeContext() +524
   System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType) +26
   System.Data.Entity.Internal.Linq.InternalSet`1.Initialize() +71
   System.Data.Entity.Internal.Linq.InternalSet`1.GetEnumerator() +21
   System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +446
   System.Linq.Enumerable.ToList(IEnumerable`1 source) +80

Zunächst war es eine Herausforderung, statt den „normalen“ Oracle.DataAccess-Klassen die Oracle.ManagedDataAccess-Klassen zum Laufen zu bringen. Hier haben uns zwei Artikel geholfen:

Wir haben dann zum Lösen des eigentlichen Fehlers lange rumgesucht, viel ausprobiert und schließlich beim Weblog-Artikel „SOLVED: Windows Identity Foundation – “The system cannot find the file specified”“ fündig geworden.

Die Lösung bestand dann schlicht darin, im Anwendungspool (App Pool) für die Anwendung die Option „Benutzerprofil laden“ auf „True“ zu stellen:

IIS App Pool - Benutzerprofil laden

Danach lief alles wie gewünscht.

Handling WM_MOVING in Windows Forms

Just a quick snippet:

public class FormWithWmMoving :
    Form
{
    private const int WM_MOVING = 0x0216;

    private static readonly object EVENT_MOVING = new object();

    public event EventHandler Moving
    {
        add { Events.AddHandler(EVENT_MOVING, value); }
        remove { Events.RemoveHandler(EVENT_MOVING, value); }
    }

    public class MovingEventArgs : EventArgs
    {
        private readonly Rectangle _rectangle;

        public MovingEventArgs(
            Rectangle rectangle)
        {
            _rectangle = rectangle;
        }

        public Rectangle Rectangle
        {
            get { return _rectangle; }
        }
    }

    protected virtual void OnMoving(MovingEventArgs e)
    {
        var h = (EventHandler)Events[EVENT_MOVING];
        if (h != null)
        {
            h(this, e);
        }
    }

    protected override void WndProc(ref Message m)
    {
        if (m.Msg == WM_MOVING)
        {
            var r = (Win32NativeMethods.RECT)Marshal.PtrToStructure(m.LParam, typeof(Win32NativeMethods.RECT));
            var rectangle = new Rectangle(r.left, r.top, r.Bounds.Width, r.Bounds.Height);

            var args = new MovingEventArgs(rectangle);
            OnMoving(args);
        }

        base.WndProc(ref m);
    }
}

Hope this is helpful someday to me or others.

XCOPY/ROBOCOPY like class in C#

During the process of moving some command scripts to a more robust solution that involved C# Script, I was in the need to replace an XCOPY call with an equivalent in C#.

What I wanted to avoid is to simply start a CMD.EXE process and call the XCOPY command.

Instead I looked for a class/function in .NET/C# that can serve as a replacement. Although I found some solutions, none of them worked the way I wanted them.

Bring your own code

So I decided to develop my own small solutions that is no rocket science code but fulfills my requirements.

It has fewer features as XCOPY and is intended for copying folders (the original XCOPY works for both files and folders). In addition it is being designed to be used in a console environment (i.e. the operations are synchronously and blocking).

An example call looks like:

var options =
    new ZetaFolderXCopyOptions
        {
            FilesPattern = "*.*",
            RecurseFolders = true,
            CopyEmptyFolders = true,
            CopyHiddenAndSystemFiles = true,
            OverwriteExistingFiles = true,
            CopyOnlyIfSourceIsNewer = false,
            FoldersPattern = "*"
        }
        .AddExcludeSubStrings(
            "\\.svn\\",
            "\\_svn\\",
            "\\_Temporary\\" );

var xc = new ZetaFolderXCopy();
xc.Copy(
    sourceFolderPath,
    destinationFolderPath,
    options );

The full code consists of a single .CS file and can be downloaded from here for free.

Hopefully this code is of some basic usage to you, keep the feedback coming!

Update 2015-11-25

I’ve uploaded a greatly enhanced version which adds wildcard and Regex exclude support  as well as retry options.

This is another step towards a native C#/.net version of robocopy.