Entity Framework 4.1 The model backing the context has changed since the database was created, immediately after creating DB

Question

I am working on a project which uses Entity Framework 4.1 for persisting our various objects to the database (code first).

I am testing in Visual Studio with a local

Answer 1

Are the two servers running your application running different operating systems (or service packs?) It appears the SHA256CryptoService used can throw a PlatformNotSupportedException which causes it to fallback to another method.

http://msdn.microsoft.com/en-us/library/system.security.cryptography.sha256cryptoserviceprovider.sha256cryptoserviceprovider.aspx

// System.Data.Entity.Internal.CodeFirstCachedMetadataWorkspace
private static SHA256 GetSha256HashAlgorithm()
{
  SHA256 result;
  try
  {
    result = new SHA256CryptoServiceProvider();
  }
  catch (PlatformNotSupportedException)
  {
    result = new SHA256Managed();
  }
  return result;
}

You may be able to test this by using reflection to invoke the following 2 (internal/private) methods on each server.

MetaDataWorkspace.ToMetadataWorkspace(DbDatabaseMapping, Action)
CodeFirstCachedMetadataWorkspace.ComputeSha256Hash(string xml);