Question

我试图创建一个实现MySQL实体框架的项目。我添加了EntityFramework，MySql.Data和MySQL.Data.Entities NuGet包。我也安装了mysql-connector-net-6.7.4。我试过删除并删除所有这些东西，但我仍然得到以下错误。我已将其添加为项目中的服务器，并且能够访问db并下拉test_table。我使用了MySQL连接，并且能够通过visual studio连接到数据库。我不断收到这个错误。

在context.test_table.Add(cookie)下面的代码的最后一行失败。

sql123456Entities context = new sql123456Entities();
test_table cookie = new test_table
{
    this_is_cool = "Yes it is",
    this_is_cooler = 32,
    but_is_it_the_fonz = "Yeah!"
};

context.test_table.Add(cookie);

异常消息（内部异常为空）

{"Could not load file or assembly 'MySql.Data, Version=6.6.5.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)":"MySql.Data, Version=6.6.5.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d"}

堆栈追踪：

  at System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMarkHandle stackMark, IntPtr pPrivHostBinder, Boolean loadTypeFromPartialName, ObjectHandleOnStack type)
  at System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean loadTypeFromPartialName)
  at System.RuntimeType.GetType(String typeName, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark& stackMark)
  at System.Type.GetType(String typeName)
  at System.Data.Common.DbProviderFactories.GetFactory(DataRow providerRow)
  at System.Data.Common.DbProviderFactories.GetFactory(String providerInvariantName)
  at System.Data.Entity.Infrastructure.DependencyResolution.DefaultProviderFactoryResolver.GetService(Type type, Object key, Func`3 handleFailedLookup)
  at System.Data.Entity.Infrastructure.DependencyResolution.DefaultProviderFactoryResolver.GetService(Type type, Object key)
  at System.Data.Entity.Infrastructure.DependencyResolution.CachingDependencyResolver.<>c__DisplayClass1.<GetService>b__0(Tuple`2 k)
  at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
  at System.Data.Entity.Infrastructure.DependencyResolution.CachingDependencyResolver.GetService(Type type, Object key)
  at System.Data.Entity.Infrastructure.DependencyResolution.ResolverChain.<>c__DisplayClass3.<GetService>b__0(IDbDependencyResolver r)
  at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()
  at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source, Func`2 predicate)
  at System.Data.Entity.Infrastructure.DependencyResolution.ResolverChain.GetService(Type type, Object key)
  at System.Data.Entity.Infrastructure.DependencyResolution.RootDependencyResolver.GetService(Type type, Object key)
  at System.Data.Entity.Core.EntityClient.EntityConnection.ChangeConnectionString(String newConnectionString)
  at System.Data.Entity.Core.EntityClient.EntityConnection..ctor(String connectionString)
  at System.Data.Entity.Internal.LazyInternalConnection.InitializeFromConnectionStringSetting(ConnectionStringSettings appConfigConnection)
  at System.Data.Entity.Internal.LazyInternalConnection.TryInitializeFromAppConfig(String name, AppConfig config)
  at System.Data.Entity.Internal.LazyInternalConnection.Initialize()
  at System.Data.Entity.Internal.LazyInternalConnection.CreateObjectContextFromConnectionModel()
  at System.Data.Entity.Internal.LazyInternalContext.InitializeContext()
  at System.Data.Entity.Internal.InternalContext.Initialize()
  at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType)
  at System.Data.Entity.Internal.Linq.InternalSet`1.Initialize()
  at System.Data.Entity.Internal.Linq.InternalSet`1.get_InternalContext()
  at System.Data.Entity.Internal.Linq.InternalSet`1.ActOnSet(Action action, EntityState newState, Object entity, String methodName)
  at System.Data.Entity.Internal.Linq.InternalSet`1.Add(Object entity)
  at System.Data.Entity.DbSet`1.Add(TEntity entity)
  at ConsoleApplication2.Program.Main(String[] args) in c:\Users\recursor\Documents\Visual Studio 2012\Projects\CS3280\Final Project\IR\ConsoleApplication2\Program.cs:line 24
  at System.AppDomain._nExecuteAssembly(RuntimeAssembly 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.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
  at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
  at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
  at System.Threading.ThreadHelper.ThreadStart()

Answer 1

看起来app.config中有错误。在运行时，有依赖程序集具有不正确的绑定重定向。我必须运行EF5，因为这是MySQL支持的EF的最后一个版本。所以我不得不将EF绑定更改为：

    <bindingRedirect oldVersion="0.0.0.0-5.0.0.0" newVersion="5.0.0.0" />

MySQL实体框架在尝试添加时抛出异常

1 个答案: