Question

I wonder if template 10 is compatible with netstandard2.0. I have a very simple library listed below:

using Microsoft.EntityFrameworkCore;
using System;
using System.ComponentModel.DataAnnotations;

namespace TransactionModel
{
    public class MyTransaction
    {
        [Key]
        public Guid TransactionId { get; set; }
        public string BankID { get; set; }
        public string MerchantID { get; set; }
        public DateTime TransactionDate { get; set; }
        public string TransactionDescription { get; set; }
        public float TransactionAmount { get; set; }
        public string TransactionComments { get; set; }

    }
    public class TransactionContext : DbContext
    {
        public DbSet<MyTransaction> transactionBatch { get; set; }
        protected override void OnConfiguring(DbContextOptionsBuilder optionBuilder)
        {
            optionBuilder.UseSqlite("Data source=transactions.db");
        }
    }
}

This library csproj file listed below:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
        <TargetFrameworks>netcoreapp2.0;netstandard2.0</TargetFrameworks>
        <!--<TargetFramework>netstandard2.0</TargetFramework>-->
        <RuntimeFrameworkVersion>2.0.3</RuntimeFrameworkVersion>
        <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
    </PropertyGroup>

    <ItemGroup>
    <PackageReference Include="microsoft.entityframeworkcore.Sqlite" Version="2.0.1" />
    <PackageReference Include="microsoft.entityframeworkcore.tools" Version="2.0.1" />
  </ItemGroup>

</Project>

I have installed package Microsoft.EntityFrameworkCore.Sqlite and Microsoft.EntityFrameworkCore.Tools and then add-migration to scaffold the database successfully.

But when I tried to make reference to TransactionModel, the compiler generated a bunch of errors, but I think this is the main error: " Cannot resolve Assembly or Windows Metadata file.."

enter image description here

I have attached a image of my vs2017 solution. I have written no code on T10 yet, I have just created T10 template, made reference to my library and vs2017 has generated the errors. If I use UWP, I did not get such error...

So my question is whether it is possible to use T10 with EntityFrameworkCore and netstandard2.0? Is there a way to go around the error?

enter image description here

1
0
2/8/2018 1:37:43 PM

Accepted Answer

It is not possible to create a dependency FROM a .NET Core project ON the Template 10 library because the Template 10 library is a Universal Windows Library. This is true with the current version of Template 10. This will also be true with the next version of Template 10. Why? Because Template 10 is a library built to enhance UWP application development, and, as a result, requires the Windows namespace which, as you know, is not part of .NET Standard. How could it be? The Windows namespace could never be cross-platform. That being said, the fundamental interfaces of Windows 10 (new version) are not derived from Prism.Core which is a .NET Standard library. This means the navigation interfaces and MVVM classes are all external and can be inherited side-stepping Template 10. This answers your question, I hope you understand the technical reasons things are as they are.

2
2/19/2018 5:25:45 PM


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