在功能NHibernate使用多个数据库，System.TypeInitializationException了未处理 [英] Using Multiple databases in Fluent Nhibernate, System.TypeInitializationException was unhandled
问题描述
我想实现多个数据库连接流利NHibernate的样本应用程序。
我的连贯NHibernate的库如下：
My Fluent NHibernate Repository is as follows:
namespace RepositoryExample.Repository.NHibernate {
public class NHibernateRepository<T> : IRepository<T> where T : class
{
protected static Configuration config;
private static readonly ISessionFactory _globalSessionFactory = new Configuration().Configure().BuildSessionFactory();
protected static IDictionary<string, ISessionFactory> _allFactories;
public NHibernateRepository()
{
IDictionary<string, string> dataBases = new Dictionary<string, string>();
dataBases.Add("Monkey", @"Data Source=.\SQLEXPRESS;AttachDbFilename='MonkeyDB.mdf';Integrated Security=True;User Instance=True");
dataBases.Add("Banana", @"Data Source=.\SQLEXPRESS;AttachDbFilename='Banana.mdf';Integrated Security=True;User Instance=True");
// Error at below line (See stack trace for deatils below)
_allFactories = new Dictionary<string, ISessionFactory>(dataBases.Count);
foreach (var dataBase in dataBases)
{
config = Fluently.Configure()
.Database(
MsSqlConfiguration.MsSql2008.ConnectionString(dataBase.Value))
.Mappings(m => m.FluentMappings.AddFromAssemblyOf<NHibernateRepository<T>>())
.BuildConfiguration();
_allFactories.Add(dataBase.Key, config.BuildSessionFactory());
}
}
public ISession GetSession()
{
var currentIdentifier = GetCurrentIdentifier();
return _allFactories[currentIdentifier].OpenSession();
}
private string GetCurrentIdentifier()
{
if (typeof(T).ToString().Contains("Banana"))
{
return "Banana";
}
else
{
return "Monkey";
}
}
public void Save(T value)
{
var sessioned = GetSession();
using (var transaction = sessioned.BeginTransaction())
{
sessioned.Save(value);
transaction.Commit();
}
}
public void GenerateSchema(SanityCheck AreYouSure)
{
new SchemaExport(config).Create(true,true);
} }
}
和我打电话的如下：
public class NHibernateIntegrationTest
{
static void Main(string[] args)
{
var repo = new NHibernateRepository<NHibernateIntegrationTest>();
repo.GenerateSchema(SanityCheck.ThisWillDropMyDatabase);
}
}
在错误：
Error at:
_allFactories = new Dictionary<string, ISessionFactory>(dataBases.Count);
这是NHibernateRepository类的默认构造函数。
It is in NHibernateRepository class's default constructor.
StackTrace:
System.TypeInitializationException was unhandled
Message=The type initializer for 'RepositoryExample.Repository.NHibernate.NHibernateRepository`1' threw an exception.
Source=RepositoryExample
TypeName=RepositoryExample.Repository.NHibernate.NHibernateRepository`1
StackTrace:
at RepositoryExample.Repository.NHibernate.NHibernateRepository`1..ctor() in C:\Documents and Settings\pavankumarn\My Documents\Downloads\nhibernate-repository-example\RepositoryExample\Repository\NHibernate\NHibernateRepository.cs:line 44
at Test.NHibernateIntegrationTest.Main(String[] args) in C:\Documents and Settings\pavankumarn\My Documents\Downloads\nhibernate-repository-example\Test\NHibernateIntegrationTest.cs:line 17
at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
InnerException: NHibernate.Cfg.HibernateConfigException
Message=An exception occurred during configuration of persistence layer.
Source=NHibernate
StackTrace:
at NHibernate.Cfg.ConfigurationSchema.HibernateConfiguration..ctor(XmlReader hbConfigurationReader, Boolean fromAppSetting)
at NHibernate.Cfg.ConfigurationSchema.HibernateConfiguration..ctor(XmlReader hbConfigurationReader)
at NHibernate.Cfg.Configuration.Configure(XmlReader textReader)
at NHibernate.Cfg.Configuration.Configure(String fileName, Boolean ignoreSessionFactoryConfig)
at NHibernate.Cfg.Configuration.Configure(String fileName)
at NHibernate.Cfg.Configuration.Configure()
at RepositoryExample.Repository.NHibernate.NHibernateRepository`1..cctor() in C:\Documents and Settings\pavankumarn\My Documents\Downloads\nhibernate-repository-example\RepositoryExample\Repository\NHibernate\NHibernateRepository.cs:line 17
InnerException: System.IO.FileNotFoundException
Message=Could not find file 'C:\Documents and Settings\pavankumarn\My Documents\Downloads\nhibernate-repository-example\Test\bin\Debug\hibernate.cfg.xml'.
Source=mscorlib
FileName=C:\Documents and Settings\pavankumarn\My Documents\Downloads\nhibernate-repository-example\Test\bin\Debug\hibernate.cfg.xml
StackTrace:
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize)
at System.Xml.XmlDownloadManager.GetStream(Uri uri, ICredentials credentials)
at System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String role, Type ofObjectToReturn)
at System.Xml.XmlTextReaderImpl.OpenUrlDelegate(Object xmlResolver)
at System.Threading.CompressedStack.runTryCode(Object userData)
at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
at System.Threading.CompressedStack.Run(CompressedStack compressedStack, ContextCallback callback, Object state)
at System.Xml.XmlTextReaderImpl.OpenUrl()
at System.Xml.XmlTextReaderImpl.Read()
at System.Xml.XmlTextReader.Read()
at System.Xml.XmlCharCheckingReader.Read()
at System.Xml.XsdValidatingReader.Read()
at System.Xml.XPath.XPathDocument.LoadFromReader(XmlReader reader, XmlSpace space)
at System.Xml.XPath.XPathDocument..ctor(XmlReader reader, XmlSpace space)
at System.Xml.XPath.XPathDocument..ctor(XmlReader reader)
at NHibernate.Cfg.ConfigurationSchema.HibernateConfiguration..ctor(XmlReader hbConfigurationReader, Boolean fromAppSetting)
InnerException:
我不使用的hibernate.cfg.xml，因为我流利配置会话工厂。
，而内蒙古堆栈跟踪显示，hibernate.cfg.xml文件未找到。
见下面的截图。
I'm not using hibernate.cfg.xml, since I'm configuring the session factory Fluently. But Inner stack trace is showing that hibernate.cfg.xml file is not found. See the below screenshot.
推荐答案
您在您最内部异常有非常明确的错误信息：
You have very clear error message in your most inner exception:
找不到文件C： \Documents和Settings\pavankumarn\My
Documents\Downloads\\\
hibernate的仓库-example\Test\bin\Debug\hibernate.cfg.xml。
Could not find file 'C:\Documents and Settings\pavankumarn\My Documents\Downloads\nhibernate-repository-example\Test\bin\Debug\hibernate.cfg.xml'.
您可能在你测试项目文件。将其生成操作到无和复制到输出目录到复制如果新
You probably have that file in your Test project. Set its Build Action to None and Copy to Output Directory to Copy if newer.
编辑：
其实，这个问题是不是在构造本身，而是在它上面的一行：
Actually, the problem was not in constructor itself, but in a line above it:
private static readonly ISessionFactory _globalSessionFactory = new Configuration().Configure().BuildSessionFactory();
在这里，你在另外一台配置NHibernate的使用默认值。而默认情况下，当你创建一个新配置（），它会尝试从的app.config 加载或的hibernate.cfg.xml 。
Here you are creating another NHibernate Configuration, using the defaults. And by default, when you create a new Configuration(), it will try to load from app.config or hibernate.cfg.xml.
删除线。我没有看到任何地方使用了 _globaSessionFactory 。
Remove that line. I don't see the _globaSessionFactory used anywhere.
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