Microsoft.EntityFrameworkCore

Microsoft.EntityFrameworkCore is an open-source object-relational mapping framework for .NET. It provides a high-level abstraction and ease of use for developers to interact with databases and data models.

Features

Some of the key features of Microsoft.EntityFrameworkCore are:

• Support for multiple database providers, including SQL Server, SQLite, MySQL, PostgreSQL, and Oracle.
• Support for creating and managing databases, executing queries, and performing CRUD operations on entities.
• Support for configuration and customization of database mappings, relationships, and schema creation.
• LINQ-enabled querying and filtering of database entities with optional lazy loading.
• Integration with ASP.NET Core for building web applications.

Getting Started

To start using Microsoft.EntityFrameworkCore, you need to install the Microsoft.EntityFrameworkCore package using a package manager such as NuGet:

Install-Package Microsoft.EntityFrameworkCore

Then, you can define your data model using entity classes and DbSet properties to map to database tables and columns. For example:

public class Blog
{
    public int Id { get; set; }
    public string Title { get; set; }
    public string Url { get; set; }

    public ICollection<Post> Posts { get; set; }
}

public class Post
{
    public int Id { get; set; }
    public string Title { get; set; }
    public string Content { get; set; }

    public int BlogId { get; set; }
    public Blog Blog { get; set; }
}

Next, you need to configure the database provider and connection string in your application's configuration file or in code. For example:

services.AddDbContext<MyDbContext>(options =>
    options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

Finally, you can use the DbContext class and its DbSet properties to interact with the database and perform operations such as querying and saving data. For example:

var posts = _dbContext.Posts
    .Where(p => p.BlogId == blogId)
    .OrderByDescending(p => p.CreatedAt)
    .Take(10)
    .ToList();

Conclusion

Overall, Microsoft.EntityFrameworkCore provides a powerful and flexible tool for interacting with databases in .NET applications. Its many features and integrations make it a popular choice for developers building data-driven applications.