Fungerande version av skiktad lösning Winforms App med SQlite och entity framework

WinFormDiApp.BL/Helpers/Extensions.cs

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+namespace WinFormDiApp.BL.Helpers;
+
+public static class Extensions
+{
+    public static bool IsNumeric(this string value)
+    {
+        if (!string.IsNullOrEmpty(value))
+        {
+            if (value.All(char.IsDigit)) return true;
+            else return false;
+        }
+        else return false;
+    }
+
+    public static bool IsDate(this string value) { 
+        if (!string.IsNullOrEmpty(value) && value.Length<20)
+        {
+            if (DateTime.TryParse(value, out DateTime date))
+            {
+                return true;
+            }
+            else return false;
+        }
+        else return false;
+    }
+}

WinFormDiApp.BL/Models/AccountRecord.cs

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+using WinFormDiApp.BL.Models.Common;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace WinFormDiApp.BL.Models
+{
+    public class AccountRecord : BaseEntity
+    {
+        public DateTime BetalDatum { get; set; } = DateTime.MinValue;
+        public string Mottagare { get; set; } = string.Empty;
+        public string Konto { get; set; } = string.Empty;
+        public double Belopp { get; set; }
+        public string Avisering { get; set; } = string.Empty;
+
+    }
+}

WinFormDiApp.BL/Models/Common/BaseEntity.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace WinFormDiApp.BL.Models.Common
+{
+    public abstract class BaseEntity
+    {
+        [Key]
+        public int Id { get; set; }
+    }
+}

WinFormDiApp.BL/Models/Member.cs

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+using WinFormDiApp.BL.Models.Common;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace WinFormDiApp.BL.Models;
+
+public class Member : BaseEntity
+{
+    public string FirstName { get; set; } = string.Empty;
+    public string LastName { get; set; } = string.Empty;
+    public string NickName { get; set; } = string.Empty;
+    public string PersonType { get; set; } = string.Empty;
+    public string Email { get; set; } = string.Empty;
+
+}

WinFormDiApp.BL/WinFormDiApp.BL.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Folder Include="Models\Enums\" />
+  </ItemGroup>
+
+</Project>