Пагинация для desktop

ConfectionaryBusinessLogic/MessageInfoLogic.cs

@@ -3,6 +3,7 @@ using ConfectioneryContracts.BusinessLogicsContracts;
 using ConfectioneryContracts.SearchModels;
 using ConfectioneryContracts.StoragesContract;
 using ConfectioneryContracts.ViewModels;
+using DocumentFormat.OpenXml.EMMA;
 using Microsoft.Extensions.Logging;
 using System;
 using System.Collections.Generic;
@@ -16,10 +17,10 @@ namespace ConfectioneryBusinessLogic
 	{
 		private readonly ILogger _logger;
 		private readonly IMessageInfoStorage _messageInfoStorage;
-		public MessageInfoLogic(ILogger<MessageInfoLogic> logger, IMessageInfoStorage MessageInfoStorage)
+		public MessageInfoLogic(ILogger<MessageInfoLogic> logger, IMessageInfoStorage messageInfoStorage)
 		{
 			_logger = logger;
-			_messageInfoStorage = MessageInfoStorage;
+			_messageInfoStorage = messageInfoStorage;
 		}
 
 		public bool Create(MessageInfoBindingModel model)
@@ -44,5 +45,18 @@ namespace ConfectioneryBusinessLogic
 			_logger.LogInformation("ReadList. Count:{Count}", list.Count);
 			return list;
 		}
+
+		public List<MessageInfoViewModel>? ReadPage(int page, int pageSize)
+		{
+			_logger.LogInformation("ReadPage. page: {page}, pageSize: {pageSize} ", page, pageSize);
+			var list = _messageInfoStorage.GetListOnPage(page, pageSize);
+			if (list == null)
+			{
+				_logger.LogWarning("ReadPage. Uncorrect range messages for page");
+				return null;
+			}
+			_logger.LogInformation("ReadPage. Count:{Count}", list.Count);
+			return list;
+		}
 	}
 }

ConfectionaryFileImplement/MessageInfoStorage.cs

@@ -24,6 +24,17 @@ namespace ConfectioneryFileImplement
 			return null;
 		}
 
+		public List<MessageInfoViewModel>? GetListOnPage(int page, int pageSize)
+		{
+			if (page * pageSize >= _source.Messages.Count)
+			{
+				return null;
+			}
+			return _source.Messages.Skip((page - 1) * pageSize).Take(pageSize)
+				.Select(x => x.GetViewModel)
+				.ToList();
+		}
+
 		public List<MessageInfoViewModel> GetFilteredList(MessageInfoSearchModel model)
 		{
 			return _source.Messages

ConfectionaryListImplement/MessageInfoStorage.cs

@@ -24,6 +24,20 @@ namespace ConfectioneryListImplement
 			return null;
 		}
 
+		public List<MessageInfoViewModel>? GetListOnPage(int page, int pageSize)
+		{
+			if (page * pageSize >= _source.Messages.Count)
+			{
+				return null;
+			}
+			List<MessageInfoViewModel> result = new();
+			for (var i = (page - 1) * pageSize; i < page * pageSize; i++)
+			{
+				result.Add(_source.Messages[i].GetViewModel);
+			}
+			return result;
+		}
+
 		public List<MessageInfoViewModel> GetFilteredList(MessageInfoSearchModel model)
 		{
 			List<MessageInfoViewModel> result = new();

Confectionery/FormViewMail.Designer.cs

@@ -29,24 +29,62 @@
 		private void InitializeComponent()
 		{
 			dataGridView = new DataGridView();
+			buttonPrevPage = new Button();
+			buttonNextPage = new Button();
+			labelInfoPages = new Label();
 			((System.ComponentModel.ISupportInitialize)dataGridView).BeginInit();
 			SuspendLayout();
 			// 
 			// dataGridView
 			// 
+			dataGridView.Anchor = AnchorStyles.Top | AnchorStyles.Bottom | AnchorStyles.Left | AnchorStyles.Right;
 			dataGridView.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.AutoSize;
-			dataGridView.Dock = DockStyle.Fill;
 			dataGridView.Location = new Point(0, 0);
 			dataGridView.Name = "dataGridView";
 			dataGridView.RowTemplate.Height = 25;
-			dataGridView.Size = new Size(803, 450);
+			dataGridView.Size = new Size(730, 454);
 			dataGridView.TabIndex = 0;
 			// 
+			// buttonPrevPage
+			// 
+			buttonPrevPage.Anchor = AnchorStyles.Bottom | AnchorStyles.Left;
+			buttonPrevPage.Location = new Point(12, 460);
+			buttonPrevPage.Name = "buttonPrevPage";
+			buttonPrevPage.Size = new Size(75, 23);
+			buttonPrevPage.TabIndex = 1;
+			buttonPrevPage.Text = "<<<";
+			buttonPrevPage.UseVisualStyleBackColor = true;
+			buttonPrevPage.Click += ButtonPrevPage_Click;
+			// 
+			// buttonNextPage
+			// 
+			buttonNextPage.Anchor = AnchorStyles.Bottom | AnchorStyles.Left;
+			buttonNextPage.Location = new Point(203, 460);
+			buttonNextPage.Name = "buttonNextPage";
+			buttonNextPage.Size = new Size(75, 23);
+			buttonNextPage.TabIndex = 2;
+			buttonNextPage.Text = ">>>";
+			buttonNextPage.UseVisualStyleBackColor = true;
+			buttonNextPage.Click += ButtonNextPage_Click;
+			// 
+			// labelInfoPages
+			// 
+			labelInfoPages.Anchor = AnchorStyles.Bottom | AnchorStyles.Left;
+			labelInfoPages.Location = new Point(93, 464);
+			labelInfoPages.Name = "labelInfoPages";
+			labelInfoPages.Size = new Size(104, 19);
+			labelInfoPages.TabIndex = 3;
+			labelInfoPages.Text = "{0} страница";
+			labelInfoPages.TextAlign = ContentAlignment.MiddleCenter;
+			// 
 			// FormViewMail
 			// 
 			AutoScaleDimensions = new SizeF(7F, 15F);
 			AutoScaleMode = AutoScaleMode.Font;
-			ClientSize = new Size(800, 450);
+			ClientSize = new Size(727, 498);
+			Controls.Add(labelInfoPages);
+			Controls.Add(buttonNextPage);
+			Controls.Add(buttonPrevPage);
 			Controls.Add(dataGridView);
 			Name = "FormViewMail";
 			Text = "Письма";
@@ -58,5 +96,8 @@
 		#endregion
 
 		private DataGridView dataGridView;
+		private Button buttonPrevPage;
+		private Button buttonNextPage;
+		private Label labelInfoPages;
 	}
 }

Confectionery/FormViewMail.cs

@@ -10,6 +10,7 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;
+using ConfectioneryContracts.ViewModels;
 
 namespace ConfectioneryView
 {
@@ -17,19 +18,27 @@ namespace ConfectioneryView
 	{
 		private readonly ILogger _logger;
 		private readonly IMessageInfoLogic _logic;
+		private int currentPage = 1;
+		public int pageSize = 5;
 
 		public FormViewMail(ILogger<FormViewMail> logger, IMessageInfoLogic logic)
 		{
 			InitializeComponent();
 			_logger = logger;
 			_logic = logic;
+			buttonPrevPage.Enabled = false;
 		}
 
 		private void FormViewMail_Load(object sender, EventArgs e)
+		{
+			MailLoad();
+		}
+
+		private bool MailLoad()
 		{
 			try
 			{
-				var list = _logic.ReadList(null);
+				var list = _logic.ReadPage(currentPage, pageSize);
 				if (list != null)
 				{
 					dataGridView.DataSource = list;
@@ -38,12 +47,49 @@ namespace ConfectioneryView
 					dataGridView.Columns["Body"].AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill;
 				}
 				_logger.LogInformation("Загрузка списка писем");
+				labelInfoPages.Text = $"{currentPage} страница";
+				return true;
 			}
 			catch (Exception ex)
 			{
 				_logger.LogError(ex, "Ошибка загрузки писем");
 				MessageBox.Show(ex.Message, "Ошибка", MessageBoxButtons.OK,
-				MessageBoxIcon.Error);
+					MessageBoxIcon.Error);
+				return false;
+			}
+		}
+
+		private void ButtonPrevPage_Click(object sender, EventArgs e)
+		{
+			if (currentPage == 1)
+			{
+				_logger.LogWarning("Неккоректный номер страницы {page}", currentPage - 1);
+				return;
+			}
+			currentPage--;
+			if (MailLoad())
+			{
+				buttonNextPage.Enabled = true;
+				if (currentPage == 1)
+				{
+					buttonPrevPage.Enabled = false;
+				}
+			}
+		}
+
+		private void ButtonNextPage_Click(object sender, EventArgs e)
+		{
+			currentPage++;
+			if (!MailLoad() || ((List<MessageInfoViewModel>)dataGridView.DataSource).Count == 0)
+			{
+				_logger.LogWarning("Out of range messages");
+				currentPage--;
+				MailLoad();
+				buttonNextPage.Enabled = false;
+			}
+			else
+			{
+				buttonPrevPage.Enabled = true;
 			}
 		}
 	}

ConfectioneryContracts/BusinessLogicsContracts/IMessageInfoLogic.cs

@@ -14,5 +14,7 @@ namespace ConfectioneryContracts.BusinessLogicsContracts
 		List<MessageInfoViewModel>? ReadList(MessageInfoSearchModel? model);
 
 		bool Create(MessageInfoBindingModel model);
+
+		public List<MessageInfoViewModel>? ReadPage(int page, int pageSize);
 	}
 }

ConfectioneryContracts/StoragesContract/IMessageInfoStorage.cs

@@ -13,6 +13,8 @@ namespace ConfectioneryContracts.StoragesContract
 	{
 		List<MessageInfoViewModel> GetFullList();
 
+		List<MessageInfoViewModel>? GetListOnPage(int page, int pageSize);
+
 		List<MessageInfoViewModel> GetFilteredList(MessageInfoSearchModel model);
 
 		MessageInfoViewModel? GetElement(MessageInfoSearchModel model);

ConfectioneryDatabaseImplement/MessageInfoStorage.cs

@@ -19,6 +19,21 @@ namespace ConfectioneryDatabaseImplement
 			return null;
 		}
 
+		public List<MessageInfoViewModel>? GetListOnPage(int page, int pageSize)
+		{
+			using var context = new ConfectioneryDatabase();
+			try
+			{
+				return context.Messages.Skip((page - 1) * pageSize).Take(pageSize)
+					.Select(x => x.GetViewModel)
+					.ToList();
+			}
+			catch (Exception)
+			{
+				return null;
+			}
+		}
+
 		public List<MessageInfoViewModel> GetFilteredList(MessageInfoSearchModel model)
 		{
 			using var context = new ConfectioneryDatabase();