added example for cascade delete

Author: morrisjdev

CascadeExample/CascadeExample.csproj

@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>netcoreapp3.1</TargetFramework>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\FileContextCore\FileContextCore.csproj" />
+    </ItemGroup>
+
+</Project>

CascadeExample/Data/Base.cs

@@ -0,0 +1,10 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace CascadeExample.Data
+{
+    public class Base
+    {
+        [Key]
+        public int Id { get; set; }
+    }
+}

CascadeExample/Data/Db.cs

@@ -0,0 +1,17 @@
+using FileContextCore;
+using Microsoft.EntityFrameworkCore;
+
+namespace CascadeExample.Data
+{
+    public class Db : DbContext
+    {
+        public DbSet<User> Users { get; set; }
+        
+        public DbSet<Entry> Entries { get; set; }
+        
+        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+        {
+            optionsBuilder.UseFileContextDatabase();
+        }
+    }
+}

CascadeExample/Data/Entry.cs

@@ -0,0 +1,14 @@
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace CascadeExample.Data
+{
+    public class Entry : Base
+    {
+        public string Content { get; set; }
+
+        [ForeignKey("User")]
+        public int UserId { get; set; }
+
+        public virtual User User { get; set; }
+    }
+}

CascadeExample/Data/User.cs

@@ -0,0 +1,11 @@
+using System.Collections.Generic;
+
+namespace CascadeExample.Data
+{
+    public class User : Base
+    {
+        public string Name { get; set; }
+        
+        public virtual List<Entry> Entries { get; set; }
+    }
+}

CascadeExample/Program.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using CascadeExample.Data;
+using Microsoft.EntityFrameworkCore;
+
+namespace CascadeExample
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Db db = new Db();
+
+            // List<User> users = db.Users.ToList();
+            
+            // db.Users.Add(new User()
+            // {
+            //     Name = "Test user",
+            //     Entries = new List<Entry>()
+            //     {
+            //         new Entry() { Content = "Entry 1" },
+            //         new Entry() { Content = "Entry 2" }
+            //     }
+            // });
+            // db.SaveChanges();
+
+            // List<User> users2 = db.Users.Include(u => u.Entries).ToList();
+            //
+            db.Users.RemoveRange(db.Users.Include(u => u.Entries));
+            db.SaveChanges();
+        }
+    }
+}

FileContextCore.sln

@@ -9,6 +9,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Example", "Example\Example.
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ASPNETDemo", "ASPNETDemo\ASPNETDemo.csproj", "{8E6BFB30-5AF1-46EF-81B7-A8200616E45A}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CascadeExample", "CascadeExample\CascadeExample.csproj", "{3D51BF95-B38E-4221-AAAE-5D093FD163DA}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -27,6 +29,10 @@ Global
 		{8E6BFB30-5AF1-46EF-81B7-A8200616E45A}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{8E6BFB30-5AF1-46EF-81B7-A8200616E45A}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{8E6BFB30-5AF1-46EF-81B7-A8200616E45A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{3D51BF95-B38E-4221-AAAE-5D093FD163DA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3D51BF95-B38E-4221-AAAE-5D093FD163DA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3D51BF95-B38E-4221-AAAE-5D093FD163DA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3D51BF95-B38E-4221-AAAE-5D093FD163DA}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE