Asp.net Core EF options.UseInMemoryDatabase System.TypeLoadException - asp.net-core

Question

I used EF in Asp.net Core, but got below error in below code:
public class TodoContext : DbContext
{
public TodoContext(DbContextOptions<TodoContext> options)
: base(options)
{
}
public DbSet<TodoItem> TodoItems { get; set; }
}
Error Message:
An exception of type 'System.TypeLoadException' occurred in
Microsoft.EntityFrameworkCore.dll but was not handled in user code
Additional information: Could not load type
'Microsoft.Extensions.DependencyInjection.Extensions.ServiceCollectionExtensions'
from assembly 'Microsoft.Extensions.DependencyInjection.Abstractions,
Version=1.1.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.
Here is my Project.json
{
"dependencies": {
"Microsoft.NETCore.App": {
"version": "1.0.1",
"type": "platform"
},
"Microsoft.AspNetCore.Diagnostics": "1.0.0",
"Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
"Microsoft.AspNetCore.Server.Kestrel": "1.0.1",
"Microsoft.Extensions.Logging.Console": "1.0.0",
//Dependence for MVC
"Microsoft.AspNetCore.Mvc": "1.1.1",
"Microsoft.AspNetCore.StaticFiles": "1.1.0",
"Microsoft.Extensions.Configuration.FileExtensions": "1.1.0",
"Microsoft.Extensions.Configuration.Json": "1.1.0",
//Dependence for EF
"Microsoft.EntityFrameworkCore": "1.1.0",
"Microsoft.EntityFrameworkCore.InMemory": "1.0.0-rc2-final"
//Dependence for EF with SQL, this is avalible under VS 2017 RC
//"Microsoft.EntityFrameworkCore.SqlServer": "1.1.0",
//Entity Framework commands to maintain the database
//"Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview4-final"
},
"tools": {
"Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final"
},
"frameworks": {
"netcoreapp1.0": {
"imports": [
"dotnet5.6",
"portable-net45+win8"
]
}
},
"buildOptions": {
"emitEntryPoint": true,
//used for Razor pages which are compiled at runtime,and the compiler needs access to reference assemblies,
//to make sure it compiles correctly
"preserveCompilationContext": true
},
"runtimeOptions": {
"configProperties": {
"System.GC.Server": true
}
},
"publishOptions": {
"include": [
"wwwroot",
"web.config"
]
},
"scripts": {
"postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
}
}
Any help would be appreciated.
Reards,
Edward

Answer 1

After trying, I changed "1.0.0-rc2-final" to "1.1.0" which I already have tried, but I found there is an warning, "Dependency conflict. CoreMVCWebAPI 1.0.0 expected Microsoft.EntityFrameworkCore.InMemory >= 1.1.0 but received 1.0.0-rc2-final", after install this package manually instead of only changing project.json, it works now.
Install-Package Microsoft.EntityFrameworkCore.InMemory

Answer 2

I just wanted to add that I had to restart VS2017 before the package restore was recognised. Prior to that I was getting an error
DbContextOptionsBuilder does not contain a definition for
UseInMemoryDatabase() ...
I hope this saves you time.