> dotnet run
Project TestApp (.NETCoreApp,Version=v1.0) was previously compiled. Skipping compilation.

Hosting environment: Production  
Content root path: C:\Projects\TestApp  
Now listening on: http://localhost:5000  
Application started. Press Ctrl+C to shut down.

>set ASPNETCORE_ENVIRONMENT "Development"

SUCCESS: Specified value was saved.

dotnet new classlib c1

dotnet add reference ../c1/c1.csproj

<ItemGroup>
    <ProjectReference Include="..\c1\c1.csproj" />
  </ItemGroup>

    public class Context : DbContext
    {
        public Context():base("Server=.;Database=EfTest;Trusted_Connection=True;Integrated Security=true;")
        {
            
        }

        public DbSet<Student> Students { get; set; }
        public DbSet<Teacher> Teachers { get; set; }

    }


    public class Person
    {
        public int Id { get; set; }
        public DateTime InsertTime { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }

    }


    public class Student:Person
    {
        public string Student1 { get; set; }
    }

    public class Teacher:Person
    {
        public string Teacher1 { get; set; }

    }

  <div style="overflow: auto">
            <img  id="preview" />
        </div>

<input type="hidden" id="RealW" name="RealW" />
<input type="hidden" id="RealH" name="RealH" />

$('#preview').Jcrop({

                    aspectRatio: 2, 
                    bgFade: true, 
                    bgOpacity: .3,
                    onChange: updateInfo,
                    onSelect: updateInfo
                }, function () {
                    // use the Jcrop API to get the real image size

//============== خطوط جدید
                    $("#RealW").val($('#preview').css("width").replace("px", ""));
                    $("#RealH").val($('#preview').css("height").replace("px", ""));
//==============

                    jcrop_api = this;
                });

 public static byte[] Resize(this byte[] byteImageIn, int x1,int y1,int x2,int y2,int realW,int realH)
        {

            //convert to full size image
            ImageConverter ic = new ImageConverter();
            Image src = (Image)(ic.ConvertFrom(byteImageIn)); //original size

            if (src == null)
                return null;

// چهار خط زیر فرمول تناسب را اجرا می‌کند
            x1 = src.Width * x1 / realW;
            x2 = src.Width * x2 / realW;

            y1 = src.Height * y1 / realH;
            y2 = src.Height * y2 / realH;

            Bitmap target = new Bitmap(x2 - x1, y2 - y1);
            using (Graphics graphics = Graphics.FromImage(target))
                graphics.DrawImage(src, new Rectangle(0, 0, target.Width, target.Height),
                    new Rectangle(x1,y1,x2-x1,y2-y1), 
                    GraphicsUnit.Pixel);
            src = target;
            using (var ms = new MemoryStream())
            {
                src.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
                return ms.ToArray();
            }

        }

var config = new MapperConfiguration(cfg => {
  cfg.CreateMap<Source, Dest>();
});

IMapper mapper = config.CreateMapper();
var source = new Source();
var dest = mapper.Map<Source, Dest>(source);

Install-Package Microsoft.Owin.Cors

 public void Configuration(IAppBuilder app)
        {
            app.UseCors(CorsOptions.AllowAll);
            app.UseOAuthAuthorizationServer(SmObjectFactory.Container.GetInstance<AppOAuthOptions>());
            app.UseJwtBearerAuthentication(SmObjectFactory.Container.GetInstance<AppJwtOptions>());
            
        }

  public interface IAsyncDbSet<T> : IDbSet<T> where T : class
    {
        Task<T> FindAsync(CancellationToken cancellationToken, params Object[] keyValues);
        Task<T> FindAsync(params Object[] keyValues);
    }

return base.Set<TEntity>();