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stevsharpstevsharp
authoredMar 6, 2025
Merge pull request #1 from stevsharp/feature/efcore-loading
Feature/efcore loading
2 parents c208f52 + 2c75a9e commit 7e12fe5

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‎.gitignore

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/EfCoreGlobalFilter/obj
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/.vs/EfCoreGlobalFilter/FileContentIndex
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/.vs/EfCoreGlobalFilter/DesignTimeBuild
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/ConsolefEfcoreloading/bin/Debug/net9.0
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/ConsolefEfcoreloading/obj/Debug/net9.0
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/ConsolefEfcoreloading/obj/ConsolefEfcoreloading.csproj.nuget.dgspec.json
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/ConsolefEfcoreloading/obj/ConsolefEfcoreloading.csproj.nuget.g.props
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/ConsolefEfcoreloading/obj/ConsolefEfcoreloading.csproj.nuget.g.targets
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/ConsolefEfcoreloading/obj/project.assets.json
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/.vs/EfCoreGlobalFilter/v17/DocumentLayout.backup.json
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/.vs/EfCoreGlobalFilter/v17/DocumentLayout.json

‎.vs/EfCoreGlobalFilter/v17/.suo

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‎.vs/EfCoreGlobalFilter/v17/DocumentLayout.backup.json

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‎.vs/EfCoreGlobalFilter/v17/DocumentLayout.json

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‎ConsolefEfcoreloading/ConsolefEfcoreloading.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net9.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="9.0.2">
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<PrivateAssets>all</PrivateAssets>
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<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
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</PackageReference>
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<PackageReference Include="Microsoft.EntityFrameworkCore.Proxies" Version="9.0.2" />
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<PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="9.0.2" />
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</ItemGroup>
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</Project>

‎ConsolefEfcoreloading/DbContext/AppDbContext.cs

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using ConsolefEfcoreloading.Model;
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using Microsoft.EntityFrameworkCore;
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public class AppDbContext : DbContext
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{
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public DbSet<Customer> Customers { get; set; }
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public DbSet<Address> Addresses { get; set; }
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public DbSet<Order> Orders { get; set; }
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private readonly bool _useLazyLoading;
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public AppDbContext(bool useLazyLoading = false)
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{
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_useLazyLoading = useLazyLoading;
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}
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protected override void OnConfiguring(DbContextOptionsBuilder options)
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{
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var builder = options.UseSqlite("Data Source=mydb.db");
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// Conditionally enable lazy loading
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if (_useLazyLoading)
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{
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builder.UseLazyLoadingProxies();
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}
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}
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protected override void OnModelCreating(ModelBuilder modelBuilder)
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{
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modelBuilder.Entity<Customer>()
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.HasOne(c => c.Address)
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.WithOne(a => a.Customer)
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.HasForeignKey<Address>(a => a.CustomerId)
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.OnDelete(DeleteBehavior.Cascade);
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modelBuilder.Entity<Customer>()
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.HasMany(c => c.Orders)
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.WithOne(o => o.Customer)
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.HasForeignKey(o => o.CustomerId);
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}
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}

‎ConsolefEfcoreloading/Model/Customer.cs

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namespace ConsolefEfcoreloading.Model;
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public class Customer
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{
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public int Id { get; set; }
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public string? Name { get; set; }
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// One-to-One relationship with Address
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public virtual Address Address { get; set; } = default!;
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// One-to-Many relationship with Orders
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public virtual List<Order> Orders { get; set; } = new();
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}
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public class Address
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{
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public int Id { get; set; }
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public string Street { get; set; } = default!;
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public string City { get; set; } = default!;
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public string Country { get; set; } = default!;
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// Foreign Key to Customer
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public int CustomerId { get; set; }
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public virtual Customer Customer { get; set; } = default!;
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}
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public class Order
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{
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public int Id { get; set; }
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public string? OrderNumber { get; set; }
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// Foreign Key to Customer
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public int CustomerId { get; set; }
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public virtual Customer Customer { get; set; } = default!;
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}

‎ConsolefEfcoreloading/Program.cs

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using Castle.Core.Resource;
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using ConsolefEfcoreloading.Model;
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using Microsoft.EntityFrameworkCore;
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try
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{
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using (var context = new AppDbContext())
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{
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context.Database.EnsureDeleted();
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context.Database.EnsureCreated();
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var customer = new Customer
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{
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Name = "John Doe",
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Address = new Address
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{
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Street = "123 Main St",
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City = "New York",
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Country = "USA"
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},
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Orders = new List<Order>
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{
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new Order { OrderNumber = "ORD123" },
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new Order { OrderNumber = "ORD124" }
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}
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};
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context.Customers.Add(customer);
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context.SaveChanges();
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}
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// Lazy-loaded automatically
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Console.WriteLine($"Lazy-loaded automatically");
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using (var context = new AppDbContext(true))
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{
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var order = context.Orders.First();
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var customer = order.Customer;
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Console.WriteLine($"Customer Name: {customer.Name}");
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}
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Console.WriteLine($"Use Eager Loading");
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// Use Eager Loading
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using (var context = new AppDbContext(false))
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{
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var order = context.Orders
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.Include(o => o.Customer)
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.First();
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Console.WriteLine($"Customer Name: {order.Customer.Name}");
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}
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// Use Explicit Loading
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Console.WriteLine($"Use Explicit Loading");
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using (var context = new AppDbContext(false))
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{
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var order = context.Orders.First();
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context.Entry(order).Reference(o => o.Customer).Load();
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var customer = order.Customer;
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Console.WriteLine($"Customer Name: {customer.Name}");
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}
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}
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catch (Exception ex)
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{
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Console.WriteLine(ex);
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}
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Console.WriteLine("\nPress any key to exit...");

‎ConsolefEfcoreloading/obj/project.nuget.cache

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{
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"version": 2,
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"dgSpecHash": "abzlcYzDxp4=",
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"success": true,
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"projectFilePath": "C:\\git\\EfCoreAndGlobalFilter\\ConsolefEfcoreloading\\ConsolefEfcoreloading.csproj",
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"expectedPackageFiles": [
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],
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"logs": []
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}

‎EfCoreGlobalFilter.sln

+7-1
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@@ -1,10 +1,12 @@
11

22
Microsoft Visual Studio Solution File, Format Version 12.00
33
# Visual Studio Version 17
4-
VisualStudioVersion = 17.13.35818.85 d17.13
4+
VisualStudioVersion = 17.13.35818.85
55
MinimumVisualStudioVersion = 10.0.40219.1
66
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EfCoreGlobalFilter", "EfCoreGlobalFilter\EfCoreGlobalFilter.csproj", "{1943DF80-6398-40CC-9221-6B1725EF39AC}"
77
EndProject
8+
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ConsolefEfcoreloading", "ConsolefEfcoreloading\ConsolefEfcoreloading.csproj", "{DF33E9C7-706C-461A-AE39-1D82C99A368E}"
9+
EndProject
810
Global
911
GlobalSection(SolutionConfigurationPlatforms) = preSolution
1012
Debug|Any CPU = Debug|Any CPU
@@ -15,6 +17,10 @@ Global
1517
{1943DF80-6398-40CC-9221-6B1725EF39AC}.Debug|Any CPU.Build.0 = Debug|Any CPU
1618
{1943DF80-6398-40CC-9221-6B1725EF39AC}.Release|Any CPU.ActiveCfg = Release|Any CPU
1719
{1943DF80-6398-40CC-9221-6B1725EF39AC}.Release|Any CPU.Build.0 = Release|Any CPU
20+
{DF33E9C7-706C-461A-AE39-1D82C99A368E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
21+
{DF33E9C7-706C-461A-AE39-1D82C99A368E}.Debug|Any CPU.Build.0 = Debug|Any CPU
22+
{DF33E9C7-706C-461A-AE39-1D82C99A368E}.Release|Any CPU.ActiveCfg = Release|Any CPU
23+
{DF33E9C7-706C-461A-AE39-1D82C99A368E}.Release|Any CPU.Build.0 = Release|Any CPU
1824
EndGlobalSection
1925
GlobalSection(SolutionProperties) = preSolution
2026
HideSolutionNode = FALSE

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