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A data access library for MongoDB with an elegant api, LINQ support and built-in entity relationship management
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Tests v8.1 release Sep 14, 2019
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MongoDB.Entities.sln parallel thread benchmark project added May 1, 2019 fix wiki link Sep 13, 2019
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This library simplifies access to mongodb by abstracting away the C# mongodb driver and providing some additional features on top of it. The API is clean and intuitive resulting in less lines of code that is more readable/ human friendly than driver code.


  • Never have to deal with ObjectIds or BsonDocuments.
  • Everything is type safe. No magic strings needed.
  • Built-in support for One-To-One, One-To-Many and Many-To-Many relationships.
  • Query data using LINQ, lambda expressions, filters and fluent aggregations.
  • Sorting, paging and projecting is made convenient.
  • Simple data migration framework similar to EntityFramework.
  • Programatically define indexes.
  • Full text search with text indexes.
  • Multi-document transaction support.
  • Easy bulk operations.
  • Update with aggregation pipeline stages.
  • Start a GeoNear aggregation pipeline.
  • Multiple database support.
  • Project types supported: .Net Standard 2 | .Net Core | ASP.Net Core


the easy to use API is described in the wiki pages.

Code Sample

    //Initialize database connection
        new DB("bookshop");

    //Create and persist an entity
        var book = new Book { Title = "The Power Of Now" };
    //Embed as document
        var dickens = new Author { Name = "Charles Dickens" };
        book.RelatedAuthor = dickens.ToDocument();
    //One-To-One relationship
        var hemmingway = new Author { Name = "Ernest Hemmingway" };
        book.MainAuthor = hemmingway.ToReference();

    //One-To-Many relationship
        var tolle = new Author { Name = "Eckhart Tolle" };

    //Many-To-Many relationship
        var genre = new Genre { Name = "Self Help" };

        var author = DB.Find<Author>().One("ID");

        var authors = DB.Find<Author>().Many(a => a.Publisher == "Harper Collins");

        var eckhart = DB.Queryable<Author>()
                        .Where(a => a.Name.Contains("Eckhart"))

        var powerofnow = genre.AllBooks.ChildrenQueryable()
                                       .Where(b => b.Title.Contains("Power"))

        var genre = book.AllGenres.ChildrenQueryable().First();


Code Examples

.net core console project: click here

integration/unit test project: click here core web-api project: click here

solutions to stackoverflow questions: click here


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