【发布时间】：2017-02-22 14:15:38
【问题描述】：
我有一个数据库，并且正在尝试建立一个 DB first EF 项目。我的项目是一个使用 .Net Core 的 Web API 项目。我发出的命令是这样的：
Scaffold-DbContext "Server=Server\Instance;Database=MyDatabase;Trusted_Connection=True;" Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models
但是，我收到以下错误：
Could not load file or assembly 'Microsoft.EntityFrameworkCore.Design' or one of its dependencies. The system cannot find the file specified.
System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.EntityFrameworkCore.Design' or one of its dependencies. The system cannot find the file specified.
File name: 'Microsoft.EntityFrameworkCore.Design'
at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
at System.Activator.CreateInstance(String assemblyString, String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, Evidence securityInfo, StackCrawlMark& stackMark)
at System.Activator.CreateInstance(String assemblyName, String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at System.AppDomain.CreateInstance(String assemblyName, String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at System.AppDomain.CreateInstanceAndUnwrap(String assemblyName, String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at System.AppDomain.CreateInstanceAndUnwrap(String assemblyName, String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at Microsoft.EntityFrameworkCore.Tools.AppDomainOperationExecutor..ctor(String assembly, String startupAssembly, String projectDir, String contentRootPath, String dataDirectory, String rootNamespace, String environment)
at Microsoft.EntityFrameworkCore.Tools.Commands.ProjectCommandBase.CreateExecutor()
at Microsoft.EntityFrameworkCore.Tools.Commands.DbContextScaffoldCommand.Execute()
at Microsoft.DotNet.Cli.CommandLine.CommandLineApplication.Execute(String[] args)
at Microsoft.EntityFrameworkCore.Tools.Program.Main(String[] args)
此项目的依赖项在这里：
"dependencies": {
"Microsoft.Extensions.Options.ConfigurationExtensions": "1.1.0",
"Microsoft.NETCore.App": "1.1.0",
"NETStandard.Library": "1.6.1",
"Microsoft.ApplicationInsights.AspNetCore": "2.0.0",
"Microsoft.AspNetCore.Mvc": "1.1.1",
"Microsoft.AspNetCore.Routing": "1.1.0",
"Microsoft.AspNetCore.Server.IISIntegration": "1.1.0",
"Microsoft.AspNetCore.Server.Kestrel": "1.1.0",
"Microsoft.Extensions.Configuration.Json": "1.1.0",
"Microsoft.Extensions.Logging": "1.1.0",
"Microsoft.Extensions.Logging.Console": "1.1.0",
"Microsoft.Extensions.Logging.Debug": "1.1.0",
"Microsoft.EntityFrameworkCore": "1.1.0",
"Microsoft.EntityFrameworkCore.SqlServer": "1.1.0",
"Microsoft.EntityFrameworkCore.Tools": "1.1.0-msbuild3-final",
"Microsoft.EntityFrameworkCore.SqlServer.Design": "1.1.0",
"Microsoft.EntityFrameworkCore.Relational.Design": "1.1.0",
"Microsoft.EntityFrameworkCore.Design": "1.1.0",
"System.Collections.NonGeneric": "4.3.0",
"Microsoft.AspNetCore.Hosting.Abstractions": "1.1.0"
},
如你所见，它被引用了。
请有人指出我正确的方向吗？
编辑：
在它之前是当前（完整的）project.json：
{
"dependencies": {
"Microsoft.ApplicationInsights.AspNetCore": "2.0.0",
"Microsoft.AspNetCore.Hosting.Abstractions": "1.1.0",
"Microsoft.AspNetCore.Mvc": "1.1.1",
"Microsoft.AspNetCore.Routing": "1.1.0",
"Microsoft.AspNetCore.Server.IISIntegration": "1.1.0",
"Microsoft.AspNetCore.Server.Kestrel": "1.1.0",
"Microsoft.EntityFrameworkCore": "1.1.0",
"Microsoft.EntityFrameworkCore.Design": "1.1.0",
"Microsoft.EntityFrameworkCore.Relational.Design": "1.1.0",
"Microsoft.EntityFrameworkCore.SqlServer": "1.1.0",
"Microsoft.EntityFrameworkCore.SqlServer.Design": "1.1.0",
"Microsoft.EntityFrameworkCore.Tools.DotNet": "1.1.0-preview4-final",
"Microsoft.Extensions.Configuration.Json": "1.1.0",
"Microsoft.Extensions.Logging": "1.1.0",
"Microsoft.Extensions.Logging.Console": "1.1.0",
"Microsoft.Extensions.Logging.Debug": "1.1.0",
"Microsoft.Extensions.Options.ConfigurationExtensions": "1.1.0",
"Microsoft.NETCore.App": "1.1.0",
"NETStandard.Library": "1.6.1",
"System.Collections.NonGeneric": "4.3.0"
},
"tools": {
"Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final"
},
"frameworks": {
"netcoreapp1.0": {
"imports": [
"dotnet5.6",
"portable-net45+win8"
]
}
},
"buildOptions": {
"emitEntryPoint": true,
"preserveCompilationContext": true
},
"runtimeOptions": {
"configProperties": {
"System.GC.Server": true
}
},
"runtimes": {
"win10-x64": {}
},
"publishOptions": {
"include": [
"wwwroot",
"**/*.cshtml",
"appsettings.json",
"web.config"
]
},
"scripts": {
"postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
}
}
使用这个配置，我得到一个编译错误：
Can not find runtime target for framework '.NETCoreApp,Version=v1.0' compatible with one of the target runtimes: 'win10-x86, win81-x86, win8-x86, win7-x86'. Possible causes: JourneyService C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v14.0\DotNet\Microsoft.DotNet.Common.Targets 262 Build
【问题讨论】：
-
试试我的 GUI 包装器：github.com/ErikEJ/SqlCeToolbox/wiki/Release-notes
-
删除
project.lock.json，然后尝试dotnet restore，可能会有帮助。 -
没什么区别
-
可能缺少
Microsoft.EntityFrameworkCore.Relational.Design- nuget.org/packages/Microsoft.EntityFrameworkCore.Design -
确实不见了；但是，添加它没有任何区别
标签： asp.net-core entity-framework-core