Созданы классы

LabWork/LabWork/ContactBindingModel.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using LabWork.Interfaces;
+
+namespace LabWork
+{
+	public class ContactBindingModel : IContactModel
+	{
+		public int Id { get; set; }
+		public string ContactName { get; set; } = string.Empty;
+		public double Number { get; set; }
+	}
+}

LabWork/LabWork/ContactLogic.cs

@@ -0,0 +1,95 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using LabWork.Interfaces;
+
+namespace LabWork
+{
+	public class ContactLogic : IContactLogic
+	{
+		private readonly IContactStorage _ContactStorage;
+		public ContactLogic(IContactStorage ContactStorage)
+		{
+			_ContactStorage = ContactStorage;
+		}
+		public List<ContactViewModel>? ReadList(ContactSearchModel? model)
+		{
+			var list = model == null ? _ContactStorage.GetFullList() : _ContactStorage.GetFilteredList(model);
+			if (list == null)
+			{
+				return null;
+			}
+			return list;
+		}
+		public ContactViewModel? ReadElement(ContactSearchModel model)
+		{
+			if (model == null)
+			{
+				throw new ArgumentNullException(nameof(model));
+			}
+			var element = _ContactStorage.GetElement(model);
+			if (element == null)
+			{
+				return null;
+			}
+			return element;
+		}
+		public bool Create(ContactBindingModel model)
+		{
+			CheckModel(model);
+			if (_ContactStorage.Insert(model) == null)
+			{
+				return false;
+			}
+			return true;
+		}
+		public bool Update(ContactBindingModel model)
+		{
+			CheckModel(model);
+			if (_ContactStorage.Update(model) == null)
+			{
+				return false;
+			}
+			return true;
+		}
+		public bool Delete(ContactBindingModel model)
+		{
+			CheckModel(model, false);
+			if (_ContactStorage.Delete(model) == null)
+			{
+				return false;
+			}
+			return true;
+		}
+		private void CheckModel(ContactBindingModel model, bool withParams = true)
+		{
+			if (model == null)
+			{
+				throw new ArgumentNullException(nameof(model));
+			}
+			if (!withParams)
+			{
+				return;
+			}
+			if (string.IsNullOrEmpty(model.ContactName))
+			{
+				throw new ArgumentNullException("Нет названия компонента",
+			   nameof(model.ContactName));
+			}
+			if (model.Number <= 0)
+			{
+				throw new ArgumentNullException("Цена компонента должна быть больше 0", nameof(model.Number));
+			}
+			var element = _ContactStorage.GetElement(new ContactSearchModel
+			{
+				ContactName = model.ContactName
+			});
+			if (element != null && element.Id != model.Id)
+			{
+				throw new InvalidOperationException("Компонент с таким названием уже есть");
+			}
+		}
+	}
+}

LabWork/LabWork/ContactSearchModel.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace LabWork
+{
+	public class ContactSearchModel
+	{
+		public int? Id { get; set; }
+		public string? ContactName { get; set; }
+	}
+}

LabWork/LabWork/ContactViewModel.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.ContactModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using LabWork.Interfaces;
+
+namespace LabWork
+{
+	public class ContactViewModel
+	{
+		public int Id { get; set; }
+		[DisplayName("Название компонента")]
+		public string ContactName { get; set; } = string.Empty;
+		[DisplayName("Цена")]
+		public double Number { get; set; }
+	}
+}

LabWork/LabWork/Database/Contact.cs

@@ -0,0 +1,56 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using LabWork.Interfaces;
+using System.ContactModel.DataAnnotations;
+
+namespace LabWork.Database
+{
+	public class Contact : IContactModel
+	{
+		public int Id { get; private set; }
+		[Required]
+		public string ContactName { get; private set; } = string.Empty;
+		[Required]
+		public double Number { get; set; }
+		public static Contact? Create(ContactBindingModel model)
+		{
+			if (model == null)
+			{
+				return null;
+			}
+			return new Contact()
+			{
+				Id = model.Id,
+				ContactName = model.ContactName,
+				Number = model.Number
+			};
+		}
+		public static Contact Create(ContactViewModel model)
+		{
+			return new Contact
+			{
+				Id = model.Id,
+				ContactName = model.ContactName,
+				Number = model.Number
+			};
+		}
+		public void Update(ContactBindingModel model)
+		{
+			if (model == null)
+			{
+				return;
+			}
+			ContactName = model.ContactName;
+			Number = model.Number;
+		}
+		public ContactViewModel GetViewModel => new()
+		{
+			Id = Id,
+			ContactName = ContactName,
+			Number = Number
+		};
+	}
+}

LabWork/LabWork/Database/ContactsDatabase.cs

@@ -0,0 +1,28 @@
+using Microsoft.EntityFrameworkCore;
+using System;
+using System.Collections.Generic;
+using System.ContactModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace LabWork.Database
+{
+	public class ContactsDatabase : DbContext
+	{
+		protected override void OnConfiguring(DbContextOptionsBuilder OptionsBuilder)
+		{
+			if (OptionsBuilder.IsConfigured == false)
+			{
+				OptionsBuilder.UseNpgsql(@"Host=localhost;Database=Contacts;Username=postgres;Password=postgres");
+			}
+
+			base.OnConfiguring(OptionsBuilder);
+
+			AppContext.SetSwitch("Npgsql.EnableLegacyTimestampBehavior", true);
+			AppContext.SetSwitch("Npgsql.DisableDateTimeInfinityConversions", true);
+		}
+
+		public virtual DbSet<Contact> Contacts { set; get; }
+	}
+}

LabWork/LabWork/Database/ContactsStorage.cs

@@ -0,0 +1,81 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using LabWork.Interfaces;
+using System.ContactModel;
+
+namespace LabWork.Database
+{
+	public class ContactStorage : IContactStorage
+	{
+		public List<ContactViewModel> GetFullList()
+		{
+			using var context = new ContactsDatabase();
+			return context.Contacts.Select(x => x.GetViewModel).ToList();
+		}
+
+		public List<ContactViewModel> GetFilteredList(ContactSearchModel model)
+		{
+			if (string.IsNullOrEmpty(model.ContactName))
+			{
+				return new();
+			}
+			using var context = new ContactsDatabase();
+			return context.Contacts.Where(x => x.ContactName.Contains(model.ContactName)).Select(x => x.GetViewModel).ToList();
+		}
+
+		public ContactViewModel? GetElement(ContactSearchModel model)
+		{
+			if (string.IsNullOrEmpty(model.ContactName) && !model.Id.HasValue)
+			{
+				return null;
+			}
+			using var context = new ContactsDatabase();
+			return context.Contacts.FirstOrDefault(x =>
+			!string.IsNullOrEmpty(model.ContactName) && x.ContactName == model.ContactName ||
+			model.Id.HasValue && x.Id == model.Id)
+				?.GetViewModel;
+		}
+
+		public ContactViewModel? Insert(ContactBindingModel model)
+		{
+			var newContact = Contact.Create(model);
+			if (newContact == null)
+			{
+				return null;
+			}
+			using var context = new ContactsDatabase();
+			context.Contacts.Add(newContact);
+			context.SaveChanges();
+			return newContact.GetViewModel;
+		}
+
+		public ContactViewModel? Update(ContactBindingModel model)
+		{
+			using var context = new ContactsDatabase();
+			var Contact = context.Contacts.FirstOrDefault(x => x.Id == model.Id);
+			if (Contact == null)
+			{
+				return null;
+			}
+			Contact.Update(model);
+			context.SaveChanges();
+			return Contact.GetViewModel;
+		}
+
+		public ContactViewModel? Delete(ContactBindingModel model)
+		{
+			using var context = new ContactsDatabase();
+			var element = context.Contacts.FirstOrDefault(rec => rec.Id == model.Id);
+			if (element != null)
+			{
+				context.Contacts.Remove(element);
+				context.SaveChanges();
+				return element.GetViewModel;
+			}
+			return null;
+		}
+	}
+}

LabWork/LabWork/FormContacts.Designer.cs

@@ -5,7 +5,7 @@
 		/// <summary>
 		///  Required designer variable.
 		/// </summary>
-		private System.ComponentModel.IContainer components = null;
+		private System.ContactModel.IContainer Contacts = null;
 
 		/// <summary>
 		///  Clean up any resources being used.
@@ -13,9 +13,9 @@
 		/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
 		protected override void Dispose(bool disposing)
 		{
-			if (disposing && (components != null))
+			if (disposing && (Contacts != null))
 			{
-				components.Dispose();
+				Contacts.Dispose();
 			}
 			base.Dispose(disposing);
 		}
@@ -26,14 +26,14 @@
 		///  Required method for Designer support - do not modify
 		///  the contents of this method with the code editor.
 		/// </summary>
-		private void InitializeComponent()
+		private void InitializeContact()
 		{
 			dataGridView = new DataGridView();
 			buttonAdd = new Button();
 			buttonUpd = new Button();
 			buttonRef = new Button();
 			buttonDel = new Button();
-			((System.ComponentModel.ISupportInitialize)dataGridView).BeginInit();
+			((System.ContactModel.ISupportInitialize)dataGridView).BeginInit();
 			SuspendLayout();
 			// 
 			// dataGridView
@@ -95,7 +95,7 @@
 			Controls.Add(dataGridView);
 			Name = "FormContacts";
 			Text = "Менеджер контактов";
-			((System.ComponentModel.ISupportInitialize)dataGridView).EndInit();
+			((System.ContactModel.ISupportInitialize)dataGridView).EndInit();
 			ResumeLayout(false);
 		}
 

LabWork/LabWork/FormContacts.cs

@@ -4,7 +4,7 @@ namespace LabWork
 	{
 		public FormContacts()
 		{
-			InitializeComponent();
+			InitializeContact();
 		}
 	}
 }

LabWork/LabWork/FormContacts.resx

@@ -56,7 +56,7 @@
 
     mimetype: application/x-microsoft.net.object.bytearray.base64
     value   : The object must be serialized into a byte array
-            : using a System.ComponentModel.TypeConverter
+            : using a System.ContactModel.TypeConverter
             : and then encoded with base64 encoding.
     -->
   <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">

LabWork/LabWork/Interfaces/IContactLogic.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace LabWork.Interfaces
+{
+	public interface IContactLogic
+	{
+		List<ContactViewModel>? ReadList(ContactSearchModel? model);
+		ContactViewModel? ReadElement(ContactSearchModel model);
+		bool Create(ContactBindingModel model);
+		bool Update(ContactBindingModel model);
+		bool Delete(ContactBindingModel model);
+	}
+}

LabWork/LabWork/Interfaces/IContactModel.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace LabWork.Interfaces
+{
+	public interface IContactModel
+	{
+		int Id { get; }
+		string ContactName { get; }
+		double Number { get; }
+	}
+}

LabWork/LabWork/Interfaces/IContactStorage.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace LabWork.Interfaces
+{
+	public interface IContactStorage
+	{
+		List<ContactViewModel> GetFullList();
+		List<ContactViewModel> GetFilteredList(ContactSearchModel model);
+		ContactViewModel? GetElement(ContactSearchModel model);
+		ContactViewModel? Insert(ContactBindingModel model);
+		ContactViewModel? Update(ContactBindingModel model);
+		ContactViewModel? Delete(ContactBindingModel model);
+	}
+}

LabWork/LabWork/Program.cs

@@ -1,17 +1,32 @@
+using Microsoft.Extensions.DependencyInjection;
+using System;
+using LabWork.Interfaces;
+using LabWork.Database;
+
 namespace LabWork
 {
 	internal static class Program
 	{
+		private static ServiceProvider? _serviceProvider;
+		public static ServiceProvider? ServiceProvider => _serviceProvider;
 		/// <summary>
 		///  The main entry point for the application.
 		/// </summary>
 		[STAThread]
 		static void Main()
 		{
-			// To customize application configuration such as set high DPI settings or default font,
-			// see https://aka.ms/applicationconfiguration.
 			ApplicationConfiguration.Initialize();
-			Application.Run(new FormContacts());
+			var services = new ServiceCollection();
+			ConfigureServices(services);
+			_serviceProvider = services.BuildServiceProvider();
+			Application.Run(_serviceProvider.GetRequiredService<FormContacts>());
+		}
+		private static void ConfigureServices(ServiceCollection services)
+		{
+			services.AddTransient<IContactStorage, ContactStorage>();
+			services.AddTransient<IContactLogic, ContactLogic>();
+			services.AddTransient<FormContact>();
+			services.AddTransient<FormContacts>();
 		}
 	}
 }