“A network-related or instance-specific error occurred while
establishing a connection to sql Server. The server was not found or
was not accessible. Verify that the instance name is correct and that
sql Server is configured to allow remote connections. sql Network Interfaces,error: 26 – Error Locating Server/Instance Specified”

错误消息我检查了我的sql Server,它确实允许远程连接.

我用以下代码抽象了我的系统,并得到相同的错误：

namespace CodeFirstConsole
{
    public class Program
    {
        static void Main(string[] args)
        {
            var db = new MyContext();
            try { Console.WriteLine(db.Parents.Count()); }
            catch (Exception) { throw; }
            Console.Read();
        }
    }

    internal class MyContext : DbContext
    {
        public DbSet<ParentObject> Parents { get; set; }
        public DbSet<ChildObject> Children { get; set; }

        public MyContext()
        {
            this.Database.Connection.ConnectionString =
                "Data Source=.;Database=ConsoleTest;Initial Catalog=ConsoleTest;User ID=dev;Password=dev;";
        }
    }

    internal class ParentObject
    {
        public int Id { get; set; }
        public string PropertyOne { get; set; }
    }

    internal class ChildObject
    {
        public int Id { get; set; }
        public bool PropertyOne { get; set; }
        public string PropertyTwo { get; set; }

        public virtual ParentObject Parent { get; set; }
    }

    internal class MyInitializer : DropCreateDatabaseAlways<MyContext>
    {

        protected override void Seed(MyContext context)
        {
            context.Parents.Add(new ParentObject() { PropertyOne = "hi" });
            base.Seed(context);
        }
    }
}