无法加载文件或程序集’MySql.Data

我正在开发ASp.net mvc 5中的应用程序并使用代码优先方法.

当我尝试启用迁移时,它会抛出一个错误.我在参考文献中找到了MySQL.Data.dll.可能是什么问题？

我上传了source at here.

如果可能的话,请指导我.谢谢

错误在下面提到;

enable-migrations -contexttypename SMSContext
Checking if the context targets an existing database...
System.IO.FileLoadException: Could not load file or assembly 'MySql.Data,Version=6.9.3.0,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)
File name: 'MySql.Data,PublicKeyToken=c5687fc88969c44d'
   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,StackCrawlMark& stackMark,Boolean loadTypeFromPartialName)
   at System.RuntimeType.GetType(String typeName,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.

最佳答案

在你的web.config中：

版本设置为6.9.3.0但在bin文件夹文件中MySql.Data.dll和MySql.Data.Entity.EF6.dll的版本为6.8.3.0

修改您的Web配置以使用正确的版本或从packages文件夹更新您的dll.

您的问题的根源是,当您使用nuget安装MySql.Data.Entities时,它将旧版本的MySql.Data替换为较新版本,但Web配置保持不变.