Question

我将.net标准类库从Entity Framework Core 1.1升级到Entity Framework 2.0

我正在尝试在针对.net framework 4.6.1的实体框架核心类库上运行Add-Migration

Add-Migration MyMigration

但是我得到以下错误

System.IO.FileLoadException：无法加载文件或程序集“System.ValueTuple，Version = 0.0.0.0，Culture = neutral，PublicKeyToken = cc7b13ffcd2ddd51＆＃39;或其中一个依赖项。定位的程序集的清单定义与程序集引用不匹配。（HRESULT异常：0x80131040）文件名：＆＃39; System.ValueTuple，Version = 0.0.0.0，Culture = neutral，PublicKeyToken = cc7b13ffcd2ddd51＆＃39; 在Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.SharedTableConvention.Apply（InternalModelBuilder modelBuilder）在Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.ImmediateConventionScope.OnModelBuilt（InternalModelBuilder modelBuilder）在Microsoft.EntityFrameworkCore.Infrastructure.ModelSource.CreateModel（DbContext上下文，IConventionSetBuilder conventionSetBuilder，IModelValidator验证器）在System.Collections.Concurrent.ConcurrentDictionary 2.GetOrAdd(TKey key, Func 2 valueFactory）在Microsoft.EntityFrameworkCore.Internal.DbContextServices.CreateModel（）在Microsoft.EntityFrameworkCore.Internal.DbContextServices.get_Model（）在Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor 2.VisitCallSite(IServiceCallSite callSite, TArgument argument) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScoped(ScopedCallSite scopedCallSite, ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor 2.VisitCallSite（IServiceCallSite callSite，TArgument参数）在Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor（ConstructorCallSite constructorCallSite，ServiceProvider provider）在Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor 2.VisitCallSite(IServiceCallSite callSite, TArgument argument) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScoped(ScopedCallSite scopedCallSite, ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor 2.VisitCallSite（IServiceCallSite callSite，TArgument参数）在Microsoft.Extensions.DependencyInjection.ServiceProvider。＆lt;＆gt; c__DisplayClass22_0.b__0（ServiceProvider provider）在Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService（IServiceProvider provider，Type serviceType）在Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService [T]（IServiceProvider提供程序）在Microsoft.EntityFrameworkCore.DbContext.get_DbContextDependencies（）在Microsoft.EntityFrameworkCore.DbContext.get_InternalServiceProvider（）在Microsoft.EntityFrameworkCore.Infrastructure.AccessorExtensions.GetService [TService]（IInfrastructure 1 accessor) at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext(Func 1工厂）在Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext（String contextType）在Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.AddMigration（String name，String outputDir，String contextType） at Microsoft.EntityFrameworkCore.Design.OperationExecutor.AddMigrationImpl（String name，String outputDir，String contextType）在Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase。＆lt;＆gt; c__DisplayClass3_0`1.b__0（）在Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute（Action action）

我将System.ValueTuple的nuget包添加到我的csproj但我仍然收到错误

 <PackageReference Include="System.ValueTuple" Version="4.4.0" />

Answer 1

将AutoGenerateBindingRedirects和GenerateBindingRedirectsOutputType添加到您的类库csproj

e.g。

<PropertyGroup>
    <TargetFramework>net461</TargetFramework>

    ....

    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
    <GenerateBindingRedirectsOutputType>true</GenerateBindingRedirectsOutputType>
</PropertyGroup>

Answer 2

我遇到了同样的问题，安装.NET 4.7.1框架后修复了它

Answer 3

从以下可爱的错误开始，因为StructureMap无法实例化Entity Framework Core的dbContext：

尝试创建类型为[[NameOfController]]的控制器时发生错误。确保控制器具有无参数的公共构造函数。

要使它在.NET Framework 4.6.2中工作，我必须做的工作比这里提供的答案还要多：

安装nuget（来源：https://github.com/neuecc/MessagePack-CSharp/issues/46）

System.Threading.Tasks.Extensions（我使用的是最新的v4.5.2）
System.ValueTuple（我使用的是旧版4.3.1）

添加到包含存储库的.proj中（来源：https://stackoverflow.com/a/45978409/581414）

<PropertyGroup> <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects> <GenerateBindingRedirectsOutputType>true</GenerateBindingRedirectsOutputType> </PropertyGroup>

然后转到web.config（来源：各种信息）

<configuration> ... <runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> ... <dependentAssembly> <assemblyIdentity name="System.ValueTuple" publicKeyToken="cc7b13ffcd2ddd51" /> <bindingRedirect oldVersion="0.0.0.0-4.0.2.0" newVersion="4.0.2.0" /> </dependentAssembly> </assemblyBinding> </runtime> ... </configuration>

＆＃39; System.ValueTuple，版本= 0.0.0.0，用于.NET 4.6.1类库上的Add-Migration

3 个答案: