Create a new solution and add a Portable Class Library (PCL) to that solution.<\/p>\n
![\"1\"](\"https:\/\/devblogs.microsoft.com\/wp-content\/uploads\/sites\/44\/2019\/03\/1.png\")
<\/p>\n
Since this isn’t a .NET Standard ( According to NuGet, the requirements of the We then need to add the Entity Framework packages to our project. Right-click the References<\/strong> folder, select Manage NuGet Packages…<\/strong>, and install the Great! Now we’re ready to start diving into some Entity Framework code.<\/p>\n If you’ve used Entity Framework before, you’ll be very familiar with how we define a Let’s start with a simple data model that we’ll call Next, let’s ensure that our Now that we have our database configured in our .NET Standard library with EF Core, let’s create an Android project to connect to this database from. Right-click the solution, click Add Project<\/strong>, and select Single-View App (Android)<\/strong>.<\/p>\n Just like before, we need to add the \n First, we need to make sure our Xamarin.Android project is referencing our .NET Standard library. In the Android project, right-click the References folder, select Add Reference…<\/strong>, and then select the library we created at the beginning of this blog post. Click OK<\/strong> to save this reference.<\/p>\n Now that we have that, let’s implement our netstandard<\/code>) library, we can convert it by right-clicking the project and navigating to the Properties:<\/p>\n![\"12.28.2016-12.19\"](\"https:\/\/devblogs.microsoft.com\/wp-content\/uploads\/sites\/44\/2019\/03\/12.28.2016-12.19.png\")
<\/p>\nMicrosoft.EntityFrameworkCore<\/code> and Microsoft.EntityFrameworkCore.Sqlite<\/code> packages specify that the library needs to target netstandard 1.3<\/code>. We can change the target in the same place:<\/p>\n![\"12.28.2016-12.21\"](\"https:\/\/devblogs.microsoft.com\/wp-content\/uploads\/sites\/44\/2019\/03\/12.28.2016-12.21.png\")
<\/p>\nMicrosoft.EntityFrameworkCore<\/code><\/a> and Microsoft.EntityFrameworkCore.Sqlite<\/code><\/a> packages.<\/p>\nDefining the DbContext<\/h3>\n
DbContext<\/code> and our underlying Models<\/code> that define our database schema.<\/p>\nCat<\/code>.<\/p>\n\nusing System.ComponentModel.DataAnnotations;\nusing System.Threading.Tasks;\n...\n public class Cat\n {\n [Key]\n public int CatId { get; set; }\n public string Name { get; set; }\n public int MeowsPerSecond { get; set; }\n }\n<\/pre>\nCat<\/code> class is part of our DbContext<\/code> by defining a new context called CatContext<\/code>.<\/p>\n\nusing Microsoft.EntityFrameworkCore;\n...\n public class CatContext : DbContext\n {\n public DbSet Cats { get; set; }\n\n private string DatabasePath { get; set; }\n\n public CatContext()\n {\n\n }\n\n public CatContext(string databasePath)\n {\n DatabasePath = databasePath;\n }\n\n protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)\n {\n optionsBuilder.UseSqlite($\"Filename={DatabasePath}\");\n }\n }\n<\/pre>\nUsing Entity Framework Core with Xamarin.Android<\/h2>\n
Getting Started<\/h3>\n
![\"12.28.2016-12.22\"](\"https:\/\/devblogs.microsoft.com\/wp-content\/uploads\/sites\/44\/2019\/03\/12.28.2016-12.22.png\")
<\/p>\nMicrosoft.EntityFrameworkCore<\/code><\/a> and Microsoft.EntityFrameworkCore.Sqlite<\/code><\/a> NuGet packages to our Android project.<\/p>\nImplementing the Context<\/h3>\n
![\"12.28.2016-13.01\"](\"https:\/\/devblogs.microsoft.com\/wp-content\/uploads\/sites\/44\/2019\/03\/12.28.2016-13.01.png\")
<\/p>\nMainActivity.cs<\/code> with some Entity Framework code!<\/p>\n\nusing System.IO;\nusing Microsoft.EntityFrameworkCore;\nusing System.Diagnostics;\nusing EntityFrameworkWithXamarin;\nusing EntityFrameworkWithXamarin.Core;\nusing System.Collections.Generic;\n...\n [Activity(Label = \"EntityFrameworkWithXamarin.Droid\", MainLauncher = true, Icon = \"@drawable\/icon\")]\n public class MainActivity : Activity\n {\n int count = 1;\n\n protected async override void OnCreate(Bundle bundle)\n {\n base.OnCreate(bundle);\n\n \/\/ Set our view from the \"main\" layout resource\n SetContentView(Resource.Layout.Main);\n \/\/ Get our button from the layout resource,\n \/\/ and attach an event to it\n Button button = FindViewById