Entity Framework for Portable Class Library

问题

I am trying to create Repository , Entity framework for Portable Class Library , when ever I try to Nuget EntityFramework

it is Failed to add reference to 'System.ComponentModel.DataAnnotations'. Please make sure that it is in the Global Assembly Cache.

Any Idea to resolve this for EF

Compatible EF package for Portable Library

回答1:

You can use fluent Api, don't use data annotations and attributes in the model class.

Example: for defining a primary key; instead of using [Key] tag, use:

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    base.OnModelCreating(modelBuilder);
    modelBuilder.Entity<Record>().HasKey<int>(s => s.ID);
}

回答2:

Prior to Visual Studio Update 2 you could create a PCL project that targets .Net 4 or .Net 4.5 and Windows 8, which would allow you to install the EntityFramework nuget package. After this update you cannot target Windows 8 without Windows Phone 8.1 being automatically targeted.

This auto targeting of Windows Phone seems to prevent adding EF package to PCL that targets Windows 8.