using Microsoft.EntityFrameworkCore;

using System;

using System.Collections.Generic;

using System.Linq;

​

public static class Exts

{

    public static void SaveDataToEntitySet<TEntity>(DbContext context, List<TEntity> list) where TEntity:class

{

    if (list.Any())

    {

        var dbSet = context.Set<TEntity>();

        var nonNulls = list.Where(x => x != null);

​

        if(list.Any(x=>x== null))

        {

            throw new Exception($"Null Detected: {list.GetType().Name}");

        }

​

        foreach (var item in nonNulls)

        {

            dbSet.Add(item);

        }

​

        context.SaveChanges();

    }

}

}

​

public class BloggingContext : DbContext

{

    public DbSet<Blog> Blogs { get; set; }

​

    public BloggingContext(DbContextOptions<BloggingContext> options)

        : base(options){}

​

}

​

public class Blog

{

    public int BlogId { get; set; }

    public string Url { get; set; }

    public string Name {get;set;}

}

​

public class Program

{

    public static void Main()

    {

        var contextOptions = new DbContextOptionsBuilder<BloggingContext>()

        .UseInMemoryDatabase("BloggingControllerTest")

        .Options;

​

    using var context = new BloggingContext(contextOptions);

​

    List<Blog> newBlogs=[        

        new Blog { Name = "Blog1", Url = "http://blog1.com" },

        new Blog { Name = "Blog2", Url = "http://blog2.com" }

    ];

    //Works normally

    context.AddRange(newBlogs);

    context.SaveChanges();

    foreach(var blog in context.Blogs)

    {

        Console.WriteLine($"{blog.BlogId} {blog.Name}");

    }

        Console.WriteLine();

    // Works with SaveDataToEntitySet as well

    List<Blog> newBlogs2=[        

        new Blog { Name = "Blog3", Url = "http://blog1.com" },

        new Blog { Name = "Blog4", Url = "http://blog2.com" }

    ];      

    Exts.SaveDataToEntitySet<Blog>(context,newBlogs2);

​

    var allBlogs=context.Blogs.ToList();

    foreach(var blog in allBlogs)

    {

        Console.WriteLine($"{blog.BlogId} {blog.Name}");

    }

    }

}