Guarantor: Contracts + DatabaseImplementation partly.

ComputerStoreContracts/BindingModels/EmployeeBindingModel.cs

@@ -12,8 +12,8 @@ namespace ComputerStoreContracts.BindingModels
         public int ID { get; set; }
         public string Username { get; set; } = string.Empty;
         public string Password { get; set; } = string.Empty;
-        public string FirstName { get; set; } = string.Empty;
+        public string? FirstName { get; set; } = string.Empty;
-        public string LastName { get; set; } = string.Empty;
+        public string? LastName { get; set; } = string.Empty;
-        public string MiddleName { get; set; } = string.Empty;
+        public string? MiddleName { get; set; } = string.Empty;
     }
 }

ComputerStoreContracts/ViewModels/EmployeeViewModel.cs

@@ -18,13 +18,13 @@ namespace ComputerStoreContracts.ViewModels
         public string Password { get; set; } = string.Empty;
 
         [DisplayName("Employee's first name")]
-        public string FirstName { get; set; } = string.Empty;
+        public string? FirstName { get; set; } = string.Empty;
 
         [DisplayName("Employee's last name")]
-        public string LastName { get; set; } = string.Empty;
+        public string? LastName { get; set; } = string.Empty;
 
         [DisplayName("Employee's middle name")]
-        public string MiddleName { get; set; } = string.Empty;
+        public string? MiddleName { get; set; } = string.Empty;
 
 
     }

ComputerStoreDataModels/Models/IEmployeeModel.cs

@@ -10,8 +10,8 @@ namespace ComputerStoreDataModels.Models
     {
         string Username { get; } 
         string Password { get; } 
-        string FirstName { get; } 
+        string? FirstName { get; } 
-        string LastName { get; } 
+        string? LastName { get; } 
-        string MiddleName { get; } 
+        string? MiddleName { get; } 
     }
 }

ComputerStoreDatabaseImplement/ComputerStoreDatabaseImplement.csproj

@@ -6,4 +6,9 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="..\ComputerStoreContracts\ComputerStoreContracts.csproj" />
+    <ProjectReference Include="..\ComputerStoreDataModels\ComputerStoreDataModels.csproj" />
+  </ItemGroup>
+
 </Project>

ComputerStoreDatabaseImplement/Models/Employee.cs

@@ -0,0 +1,66 @@
+using ComputerStoreDataModels.Models;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ComputerStoreContracts.BindingModels;
+using ComputerStoreContracts.ViewModels;
+
+namespace ComputerStoreDatabaseImplement.Models
+{
+    public class Employee : IEmployeeModel
+    {
+        public int ID { get; private set; }
+        [Required]
+        public string Username { get; private set; } = string.Empty; 
+        [Required]
+        public string Password { get; private set; } = string.Empty;
+
+        public string? FirstName { get; private set; } = string.Empty;
+        public string? LastName { get; private set; } = string.Empty;
+        public string? MiddleName { get; private set; } = string.Empty;
+
+        //[ForeignKey("EmployeeID")]
+        //public virtual List<PC> PCs { get; set; } = new();
+
+        public static Employee? Create(EmployeeBindingModel? model)
+        {
+            if (model == null)
+            {
+                return null;
+            }
+            return new Employee()
+            {
+                ID = model.ID,
+                Username = model.Username,
+                Password = model.Password,
+                FirstName = model.FirstName,
+                LastName = model.LastName,
+                MiddleName = model.MiddleName
+            };
+        }
+
+        public void Update(EmployeeBindingModel? model)
+        {
+            if (model == null) { return; }
+            Username = model.Username;
+            Password = model.Password;
+            FirstName = model.FirstName;
+            LastName = model.LastName;
+            MiddleName = model.MiddleName;
+        }
+
+        public EmployeeViewModel GetViewModel => new()
+        {
+            ID = ID,
+            Username = Username,
+            Password = Password,
+            FirstName = FirstName,
+            LastName = LastName,
+            MiddleName = MiddleName
+        };
+    }
+}