我对 Entity Framework 甚至 ADO.NET 都是一个新手(通常不怎么处理数据库)。
- 我下载并安装了MySQL Connector/NET 6.3.5 .
- 我在 Visual Studio 2010 中创建了一个新的 C# 项目。
- 我向我的项目添加了一个新的 ADO.NET 实体数据模型并选择了“从数据库生成”。
- 我使用服务器名称“localhost”+ 我的用户名和密码添加了到本地 MySQL 服务器的新连接。
- 我检查了我的 MySQL 数据库中的所有表以生成对象。
- 我写了下面的代码:
(things
只是我用一些任意字段拼凑的虚假表格。)
TestDataEntities entities = new TestDataEntities();
var things = entities.things.Execute(MergeOption.AppendOnly); // exception
上面抛出了一个NullReferenceException
,我真的不知道为什么会这样。当我测试连接时,它说它成功了。我肯定已经使用正确的用户名和密码建立了连接。我什至不知道还要调查什么。
对于那些真正了解这些东西的人来说,这是我得到的异常(exception)(尽管在我未经训练的眼中,这实际上看起来并没有那么有用):
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.Metadata.Edm.StoreItemCollection.Loader.OnProviderManifestTokenNotification(String token, Action`3 addError) at System.Data.EntityModel.SchemaObjectModel.Schema.HandleProviderManifestTokenAttribute(XmlReader reader) 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, 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.StoreItemCollectionLoader.LoadItemCollection(StoreMetadataEntry entry) 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.EntityClient.EntityConnection.InitializeMetadata(DbConnection newConnection, DbConnection originalConnection, Boolean closeOriginalConnectionOnFailure) at System.Data.EntityClient.EntityConnection.Open() at System.Data.Objects.ObjectContext.EnsureConnection() at System.Data.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption) at System.Data.Objects.ObjectQuery`1.Execute(MergeOption mergeOption) at EntityFrameworkTest.Form1..ctor() in D:\Development\EntityFrameworkTest\Form1.cs:line 23 at EntityFrameworkTest.Program.Main() in D:\Development\EntityFrameworkTest\Program.cs:line 18 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()
最佳答案
我通过添加对 MySql.Data.Entity.dll(和 MySql.Web.dll)的引用来克服这个错误
关于.net - 带有 Entity Framework 的 MySQL - 我做错了什么?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/3944475/