Nunit MySQl Error

使用NUnit测试时MySQL异常。我已经在两台机器上安装了MySQL连接器6.6.5，但是其中一台系统，当使用Nunit运行相同的测试时，我得到以下错误。而在其他系统中，它工作成功。

at MySql.Data.MySqlClient.MySqlClientFactory.get_MySqlDbProviderServicesInstance()
at MySql.Data.MySqlClient.MySqlClientFactory.System.IServiceProvider.GetService(Type serviceType)
at System.Data.Common.DbProviderServices.GetProviderServices(DbProviderFactory factory)
at System.Data.Metadata.Edm.StoreItemCollection.Loader.InitializeProviderManifest(Action`3 addError)
at System.Data.EntityModel.SchemaObjectModel.Schema.HandleAttribute(XmlReader reader)
at System.Data.EntityModel.SchemaObjectModel.SchemaElement.ParseAttribute(XmlReader reader)
at System.Data.EntityModel.SchemaObjectModel.SchemaElement.Parse(XmlReader reader)
at System.Data.EntityModel.SchemaObjectModel.Schema.HandleTopLevelSchemaElement(XmlReader reader)
at System.Data.EntityModel.SchemaObjectModel.Schema.InternalParse(XmlReader sourceReader, String sourceLocation)
at System.Data.EntityModel.SchemaObjectModel.Schema.Parse(XmlReader sourceReader, String sourceLocation)
at System.Data.EntityModel.SchemaObjectModel.SchemaManager.ParseAndValidate(IEnumerable`1 xmlReaders, IEnumerable`1 sourceFilePaths, SchemaDataModelOption dataModel, AttributeValueNotification providerNotification, AttributeValueNotification providerManifestTokenNotification, ProviderManifestNeeded providerManifestNeeded, IList`1& schemaCollection)
at System.Data.Metadata.Edm.StoreItemCollection.Loader.LoadItems(IEnumerable`1 xmlReaders, IEnumerable`1 sourceFilePaths)
at System.Data.Metadata.Edm.StoreItemCollection.Init(IEnumerable`1 xmlReaders, IEnumerable`1 filePaths, Boolean throwOnError, DbProviderManifest& providerManifest, DbProviderFactory& providerFactory, String& providerManifestToken, Memoizer`2& cachedCTypeFunction)
at System.Data.Metadata.Edm.StoreItemCollection..ctor(IEnumerable`1 xmlReaders, IEnumerable`1 filePaths)
at System.Data.Metadata.Edm.MetadataCache.StoreMetadataEntry.LoadStoreCollection(EdmItemCollection edmItemCollection, MetadataArtifactLoader loader)
at System.Data.Metadata.Edm.MetadataCache.LoadItemCollection[T](IItemCollectionLoader`1 itemCollectionLoader, T entry)
at System.Data.Metadata.Edm.MetadataCache.GetOrCreateStoreAndMappingItemCollections(String cacheKey, MetadataArtifactLoader loader, EdmItemCollection edmItemCollection, Object& entryToken)
at System.Data.EntityClient.EntityConnection.LoadStoreItemCollections(MetadataWorkspace workspace, DbConnection storeConnection, DbProviderFactory factory, DbConnectionOptions connectionOptions, EdmItemCollection edmItemCollection, MetadataArtifactLoader artifactLoader)
at System.Data.EntityClient.EntityConnection.GetMetadataWorkspace(Boolean initializeAllCollections)
at System.Data.Objects.ObjectContext.EnsureMetadata()
at System.Data.Objects.ELinq.ELinqQueryState.GetExecutionPlan(Nullable`1 forMergeOption)
at System.Data.Objects.ObjectQuery.ToTraceString()
at FreeLance.Data.Framework.EntityFramework.Repository`1.GetSingle(Expression`1 where, Expression`1[] include) in D:'CMS_Org'SonnetCMS'FreeLance'Framework'Data'FreeLance.Data.Framework'EntityFramework'Repository.cs:line 114
at FreeLance.Business.PageBC.GetUserName(Int32 userId) in D:'CMS_Org'SonnetCMS'FreeLance'Business'FreeLance.Business'Admin'PageBC.cs:line 179
at FreeLance.Services.PageService.GetUserName(Int32 userId) in D:'CMS_Org'SonnetCMS'FreeLance'Services'FreeLance.Services'PageService.cs:line 42
at TestCMS.Class1.Test() 

编辑:

函数出错的地方:

public virtual TEntity GetSingle(Expression<Func<TEntity, bool>> where, params Expression<Func<TEntity, object>>[] include)
        {
            IQueryable<TEntity> query = this.dbSet.Where(where);
            if (include != null)
            {
                query = this.dbSet.Include<TEntity>(include).Where(where);
            }
            Debug.Write(query.ToString());
            return query.SingleOrDefault<TEntity>();
        }

例外:

来源:MySql.Data

错误:Object reference not set to an instance of an object.

声明类型:{Name = "MySqlClientFactory" FullName = "MySql.Data.MySqlClient.MySqlClientFactory"}

组件:{MySql.Data, Version=6.6.5.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d}

函数this中的

。dbset有NullReferenceException，而在正确工作的系统中，我有这个。dbset,

"{SELECT
`Extent1`.`UserID`, 
`Extent1`.`UserGUID`, 
`Extent1`.`UserCode`, 
`Extent1`.`UserAuthentication`, 
`Extent1`.`UserType`, 
`Extent1`.`UserPassword`, 
`Extent1`.`UserPasswordSalt`, 
`Extent1`.`UserFirstName`, 
`Extent1`.`UserMiddleName`, 
`Extent1`.`UserLastName`, 
`Extent1`.`UserCompanyName`,
`Extent1`.`IsUserNeedToResetPasswordNextLogin`, 
`Extent1`.`UserPasswordExpiryDate`, 
`Extent1`.`UserLoginFailAttempts`, 
`Extent1`.`UserLoginFailDate`, 
`Extent1`.`UserPasswordResetDate`, 
`Extent1`.`UserPasswordResetBy`, 
`Extent1`.`UserLastLoginDate`, 
`Extent1`.`IsUserLoginLocked`, 
`Extent1`.`UserLoginLockedDate`, 
`Extent1`.`IsForUserSecurityQuestionRequired`, 
`Extent1`.`Remarks`, 
`Extent1`.`IsActive`, 
`Extent1`.`CreatedBy`, 
`Extent1`.`CreatedDate`, 
`Extent1`.`UpdatedBy`, 
`Extent1`.`UpdatedDate`
FROM `isuser` AS `Extent1`}"