Added EF.Exceptions sample

Author: linkdotnet

EntityFrameworkExceptions/BlogContext.cs

@@ -0,0 +1,20 @@
+using EntityFramework.Exceptions.Sqlite;
+using Microsoft.EntityFrameworkCore;
+
+public class BlogContext : DbContext
+{
+    public DbSet<BlogPost> BlogPosts { get; set; } = default!;
+
+    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+    {
+        optionsBuilder
+            .UseSqlite("Filename=:memory:")
+            .UseExceptionProcessor();
+    }
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<BlogPost>().Property(b => b.Title)
+            .IsRequired();
+    }
+}

EntityFrameworkExceptions/BlogPost.cs

@@ -0,0 +1,6 @@
+public class BlogPost
+{
+    public int Id { get; set; }
+    public string? Title { get; set; }
+    public string Content { get; set; } = string.Empty;
+}

EntityFrameworkExceptions/EntityFrameworkExceptions.csproj

@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net7.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="EntityFrameworkCore.Exceptions.Sqlite" Version="6.0.3" />
+      <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="7.0.9" />
+    </ItemGroup>
+
+</Project>

EntityFrameworkExceptions/EntityFrameworkExceptions.sln

@@ -0,0 +1,16 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EntityFrameworkExceptions", "EntityFrameworkExceptions.csproj", "{E2827847-99BE-4314-BBB5-3A844ECC7ACE}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{E2827847-99BE-4314-BBB5-3A844ECC7ACE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E2827847-99BE-4314-BBB5-3A844ECC7ACE}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E2827847-99BE-4314-BBB5-3A844ECC7ACE}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E2827847-99BE-4314-BBB5-3A844ECC7ACE}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

EntityFrameworkExceptions/Program.cs

@@ -0,0 +1,23 @@
+using EntityFramework.Exceptions.Common;
+using Microsoft.EntityFrameworkCore;
+
+await using var context = new BlogContext();
+context.Database.OpenConnection();
+context.Database.EnsureCreated();
+
+var blogPostWithNullTitle = new BlogPost
+{
+    Title = null,
+    Content = "Content"
+};
+
+context.BlogPosts.Add(blogPostWithNullTitle);
+try
+{
+    await context.SaveChangesAsync();
+}
+catch (CannotInsertNullException e)
+{
+    // Do something specific to this exception
+    Console.WriteLine(e);
+}

EntityFrameworkExceptions/README.md

@@ -0,0 +1,5 @@
+# Gracefully Handling Entity Framework Exceptions with EntityFramework.Exceptions
+
+Working with databases can sometimes be daunting, mainly when errors occur. These errors or exceptions can be due to many reasons, such as constraint violations, connection issues, or syntax errors. Entity Framework throws a generic DbException or DbUpdateException for most of these database issues. But we cand get more specific exceptions based on the concrete "problem"! That's where EntityFramework.Exceptions comes in.
+
+Found [here](https://steven-giesel.com/blogPost/693e8b9c-4b97-43a4-8bf7-991c633900b4)

README.md

@@ -4,6 +4,7 @@ Contains all of my examples from various blog posts. You can find a comprehensiv
 
 | BlogPost                                                                                                       | Publish Date |
 | -------------------------------------------------------------------------------------------------------------- | ------------ |
+| [Gracefully Handling Entity Framework Exceptions with EntityFramework.Exceptions](EntityFrameworkExceptions/)  | 25.07.2023   |
 | [Create your own Mediator (like Mediatr)](Mediator/)                                                           | 21.06.2023   |
 | [Verifying your DI Container](ServiceCollectionVerify/)                                                        | 30.04.2023   |
 | [.NET 8 Performance Edition](BenchmarkDotNet8/)                                                                | 12.04.2023   |