我使用企业库的ODP.NET和4.1版本，对比2008年。并且一切正常。

现在，使用Enterprise Library的ODP.NET Oracle.DataAccess 4.112.2.0和版本5.0.414.0迁移到2010，.net 4.0。

Oracle.DataAccess 4.112.2.0

EnterpriseLibrary 5.0.414.0

在最近从企业库版本4.1升级到5.0之后，一旦出现以下错误：

“数据库类型无法构建，您必须配置容器以提供此值。”

Microsoft.Practices.ServiceLocation.ActivationException: Activation

error occured while trying to get instance of type Database, key

"ConnectionStrings.Oracle.xxx" --->

Microsoft.Practices.Unity.ResolutionFailedException: Resolution of the

dependency failed, type =

"Microsoft.Practices.EnterpriseLibrary.Data.Database", name =

"ConnectionStrings.Oracle.xxx". Exception occurred while: while

resolving. Exception is: InvalidOperationException - The type Database

cannot be constructed. You must configure the container to supply this

value.

参考EntLib论坛：http://entlib.codeplex.com/discussions/215290

任何解决方案？

我的配置

providerName="Oracle.DataAccess.Client" />我的代码

var key = "ConnectionStrings.Oracle.xxx";

Database db = Microsoft.Practices.EnterpriseLibrary.Common.Configuration.EnterpriseLibraryContainer.Current.GetInstance(key); //~(EntLib 5 recommended)

using (DbCommand cm = db.GetStoredProcCommand("TBL_FRKDATA.TBL_FRKDATA_FND_ALL"))

{

cm.Parameters.Add(CreateCursorParameter("P_REFCURSOR"));

// Using "using" will cause both the DataReader and connection to be

// closed. (ExecuteReader will close the connection when the

// DataReader is closed.)

using (IDataReader dataReader = db.ExecuteReader(cm))

{

while (dataReader.Read())

{

builder.Add(dataReader);

}

return builder.EntityList;

}

}完整的错误堆栈跟踪

Microsoft.Practices.ObjectBuilder2.DynamicMethodConstructorStrategy.GuardTypeIsNonPrimitive(IBuilderContext

context, SelectedConstructor selectedConstructor)

Microsoft.Practices.ObjectBuilder2.DynamicMethodConstructorStrategy.PreBuildUp(IBuilderContext

context)

Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext

context)

Microsoft.Practices.ObjectBuilder2.DynamicMethodBuildPlanCreatorPolicy.CreatePlan(IBuilderContext

context, NamedTypeBuildKey buildKey)

Microsoft.Practices.ObjectBuilder2.BuildPlanStrategy.PreBuildUp(IBuilderContext

context)

Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext

context) Microsoft.Practices.Unity.UnityContainer.DoBuildUp(Type t,

Object existing, String name, IEnumerable1 resolverOverrides)

Microsoft.Practices.Unity.UnityContainer.DoBuildUp(Type t, Object

existing, String name, IEnumerable1 resolverOverrides)

Microsoft.Practices.Unity.UnityContainer.Resolve(Type t, String name,

ResolverOverride[] resolverOverrides)

Microsoft.Practices.Unity.UnityServiceLocator.DoGetInstance(Type

serviceType, String key)

Microsoft.Practices.ServiceLocation.ServiceLocatorImplBase.GetInstance(Type

serviceType, String key)

Microsoft.Practices.ServiceLocation.ServiceLocatorImplBase.GetInstance(Type

serviceType, String key)

Microsoft.Practices.ServiceLocation.ServiceLocatorImplBase.GetInstance[TService](String

key)

UPDATE

这段代码适用于我：

[TestMethod]

public void Conectar_con_EntLib_y_OdpNet_Test()

{

var key = "ConnectionStrings.Oracle.xxx";

string connectionString = ConfigurationManager.ConnectionStrings[key].ConnectionString;

string providerName = ConfigurationManager.ConnectionStrings[key].ProviderName;

//Database db = Microsoft.Practices.EnterpriseLibrary.Common.Configuration.EnterpriseLibraryContainer.Current.GetInstance(key);

TestContext.WriteLine("connectionString: " + connectionString);

TestContext.WriteLine("providerName: " + providerName);

DbProviderFactory factory = DbProviderFactories.GetFactory(providerName);

using (DbConnection connection = factory.CreateConnection())

{

connection.ConnectionString = connectionString;

connection.Open();

TestContext.WriteLine("Estado Conexión: " + connection.State);

connection.Close();

}

}解答：兰迪列维(http://entlib.codeplex.com/discussions/215290)

您不能将Enterprise Library OracleDatabase与Oracle.DataAccess.Client提供程序一起使用。内置的OracleDatabase被硬编码为

使用OracleClientFactory DbProviderFactory，而您想使用ODP.NET提供程序(Oracle.DataAccess.Client)。

最好的办法是让EntLibContrib Oracle ODP.NET数据提供者工作，因为它应该支持你需要的所有东西，包括配置文件。

由于看起来您可以创建DbProviderFactory，因此您可以尝试将GenericDatabase与ODP.NET OracleClientFactory一起使用，但我会猜测

您将遇到针对特定Oracle功能的问题(例如refcursor)。

你可以直接使用它：

string connectionString = ConfigurationManager.ConnectionStrings["Connection String"].ConnectionString;

string providerName = ConfigurationManager.ConnectionStrings["Connection String"].ProviderName;

DbProviderFactory factory = DbProviderFactories.GetFactory(providerName);

var db = new GenericDatabase(connectionString, factory);