Это еще фиксить и фиксить

SchoolSchedule/SchoolSchedule/MainForm.Designer.cs

@@ -0,0 +1,146 @@
+namespace SchoolSchedule
+{
+	partial class MainForm
+	{
+		/// <summary>
+		/// Required designer variable.
+		/// </summary>
+		private System.ComponentModel.IContainer components = null;
+
+		/// <summary>
+		/// Clean up any resources being used.
+		/// </summary>
+		/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
+		protected override void Dispose(bool disposing)
+		{
+			if (disposing && (components != null))
+			{
+				components.Dispose();
+			}
+			base.Dispose(disposing);
+		}
+
+		#region Windows Form Designer generated code
+
+		/// <summary>
+		/// Required method for Designer support - do not modify
+		/// the contents of this method with the code editor.
+		/// </summary>
+		private void InitializeComponent()
+		{
+			comboBox1 = new ComboBox();
+			dataGridView1 = new DataGridView();
+			RefreshButton = new Button();
+			menuStrip1 = new MenuStrip();
+			менюToolStripMenuItem = new ToolStripMenuItem();
+			ученикиToolStripMenuItem = new ToolStripMenuItem();
+			занятияToolStripMenuItem = new ToolStripMenuItem();
+			предметыToolStripMenuItem = new ToolStripMenuItem();
+			учителяToolStripMenuItem = new ToolStripMenuItem();
+			((System.ComponentModel.ISupportInitialize)dataGridView1).BeginInit();
+			menuStrip1.SuspendLayout();
+			SuspendLayout();
+			// 
+			// comboBox1
+			// 
+			comboBox1.FormattingEnabled = true;
+			comboBox1.Location = new Point(12, 32);
+			comboBox1.Name = "comboBox1";
+			comboBox1.Size = new Size(241, 23);
+			comboBox1.TabIndex = 0;
+			comboBox1.SelectedIndexChanged += comboBox1_SelectedIndexChanged;
+			// 
+			// dataGridView1
+			// 
+			dataGridView1.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.AutoSize;
+			dataGridView1.Location = new Point(12, 61);
+			dataGridView1.Name = "dataGridView1";
+			dataGridView1.Size = new Size(776, 377);
+			dataGridView1.TabIndex = 1;
+			// 
+			// RefreshButton
+			// 
+			RefreshButton.Location = new Point(259, 32);
+			RefreshButton.Name = "RefreshButton";
+			RefreshButton.Size = new Size(75, 23);
+			RefreshButton.TabIndex = 3;
+			RefreshButton.Text = "Обновить";
+			RefreshButton.UseVisualStyleBackColor = true;
+			// 
+			// menuStrip1
+			// 
+			menuStrip1.Items.AddRange(new ToolStripItem[] { менюToolStripMenuItem });
+			menuStrip1.Location = new Point(0, 0);
+			menuStrip1.Name = "menuStrip1";
+			menuStrip1.Size = new Size(800, 24);
+			menuStrip1.TabIndex = 4;
+			menuStrip1.Text = "menuStrip1";
+			// 
+			// менюToolStripMenuItem
+			// 
+			менюToolStripMenuItem.DropDownItems.AddRange(new ToolStripItem[] { ученикиToolStripMenuItem, занятияToolStripMenuItem, предметыToolStripMenuItem, учителяToolStripMenuItem });
+			менюToolStripMenuItem.Name = "менюToolStripMenuItem";
+			менюToolStripMenuItem.Size = new Size(51, 20);
+			менюToolStripMenuItem.Text = "меню";
+			// 
+			// ученикиToolStripMenuItem
+			// 
+			ученикиToolStripMenuItem.Name = "ученикиToolStripMenuItem";
+			ученикиToolStripMenuItem.Size = new Size(180, 22);
+			ученикиToolStripMenuItem.Text = "ученики";
+			ученикиToolStripMenuItem.Click += ученикиToolStripMenuItem_Click;
+			// 
+			// занятияToolStripMenuItem
+			// 
+			занятияToolStripMenuItem.Name = "занятияToolStripMenuItem";
+			занятияToolStripMenuItem.Size = new Size(180, 22);
+			занятияToolStripMenuItem.Text = "занятия";
+			занятияToolStripMenuItem.Click += занятияToolStripMenuItem_Click;
+			// 
+			// предметыToolStripMenuItem
+			// 
+			предметыToolStripMenuItem.Name = "предметыToolStripMenuItem";
+			предметыToolStripMenuItem.Size = new Size(180, 22);
+			предметыToolStripMenuItem.Text = "предметы";
+			предметыToolStripMenuItem.Click += предметыToolStripMenuItem_Click;
+			// 
+			// учителяToolStripMenuItem
+			// 
+			учителяToolStripMenuItem.Name = "учителяToolStripMenuItem";
+			учителяToolStripMenuItem.Size = new Size(180, 22);
+			учителяToolStripMenuItem.Text = "учителя";
+			учителяToolStripMenuItem.Click += учителяToolStripMenuItem_Click;
+			// 
+			// MainForm
+			// 
+			AutoScaleDimensions = new SizeF(7F, 15F);
+			AutoScaleMode = AutoScaleMode.Font;
+			ClientSize = new Size(800, 450);
+			Controls.Add(RefreshButton);
+			Controls.Add(dataGridView1);
+			Controls.Add(comboBox1);
+			Controls.Add(menuStrip1);
+			MainMenuStrip = menuStrip1;
+			Name = "MainForm";
+			Text = "MainForm";
+			Load += MainForm_Load;
+			((System.ComponentModel.ISupportInitialize)dataGridView1).EndInit();
+			menuStrip1.ResumeLayout(false);
+			menuStrip1.PerformLayout();
+			ResumeLayout(false);
+			PerformLayout();
+		}
+
+		#endregion
+
+		private ComboBox comboBox1;
+		private DataGridView dataGridView1;
+		private Button RefreshButton;
+		private MenuStrip menuStrip1;
+		private ToolStripMenuItem менюToolStripMenuItem;
+		private ToolStripMenuItem ученикиToolStripMenuItem;
+		private ToolStripMenuItem занятияToolStripMenuItem;
+		private ToolStripMenuItem предметыToolStripMenuItem;
+		private ToolStripMenuItem учителяToolStripMenuItem;
+	}
+}

SchoolSchedule/SchoolSchedule/MainForm.cs

@@ -0,0 +1,69 @@
+using SchoolScheduleContracts.BusinessLogicsContracts;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace SchoolSchedule
+{
+	public partial class MainForm : Form
+	{
+		IStudentLogic _logic;
+		public MainForm(IStudentLogic logic)
+		{
+			InitializeComponent();
+			_logic = logic;
+		}
+		private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
+		{
+			dataGridView1.DataSource = null;
+			dataGridView1.Rows.Clear();
+		}
+
+		private void MainForm_Load(object sender, EventArgs e)
+		{
+
+		}
+
+		private void ученикиToolStripMenuItem_Click(object sender, EventArgs e)
+		{
+			var service = Program.ServiceProvider?.GetService(typeof(StudentsForm));
+			if (service is StudentsForm form)
+			{
+				form.ShowDialog();
+			}
+		}
+
+		private void занятияToolStripMenuItem_Click(object sender, EventArgs e)
+		{
+			var service = Program.ServiceProvider?.GetService(typeof(LessonsForm));
+			if (service is LessonsForm form)
+			{
+				form.ShowDialog();
+			}
+		}
+
+		private void предметыToolStripMenuItem_Click(object sender, EventArgs e)
+		{
+			var service = Program.ServiceProvider?.GetService(typeof(SubjectsForm));
+			if (service is SubjectsForm form)
+			{
+				form.ShowDialog();
+			}
+		}
+
+		private void учителяToolStripMenuItem_Click(object sender, EventArgs e)
+		{
+			var service = Program.ServiceProvider?.GetService(typeof(TeachersForm));
+			if (service is TeachersForm form)
+			{
+				form.ShowDialog();
+			}
+		}
+	}
+}

SchoolSchedule/SchoolSchedule/MainForm.resx

@@ -0,0 +1,123 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!--
+    Microsoft ResX Schema 
+
+    Version 2.0
+
+    The primary goals of this format is to allow a simple XML format
+    that is mostly human readable. The generation and parsing of the
+    various data types are done through the TypeConverter classes
+    associated with the data types.
+
+    Example:
+
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+
+    There are any number of "resheader" rows that contain simple
+    name/value pairs.
+
+    Each data row contains a name, and value. The row also contains a
+    type or mimetype. Type corresponds to a .NET class that support
+    text/value conversion through the TypeConverter architecture.
+    Classes that don't support this are serialized and stored with the
+    mimetype set.
+
+    The mimetype is used for serialized objects, and tells the
+    ResXResourceReader how to depersist the object. This is currently not
+    extensible. For a given mimetype the value must be set accordingly:
+
+    Note - application/x-microsoft.net.object.binary.base64 is the format
+    that the ResXResourceWriter will generate, however the reader can
+    read any of the formats listed below.
+
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array
+            : using a System.ComponentModel.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">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <metadata name="menuStrip1.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+    <value>17, 17</value>
+  </metadata>
+</root>

SchoolSchedule/SchoolSchedule/Program.cs

@@ -20,7 +20,7 @@ namespace SchoolSchedule
 			var services = new ServiceCollection();
 			ConfigureServices(services);
 			_serviceProvider = services.BuildServiceProvider();
-			Application.Run(_serviceProvider.GetRequiredService<LessonsForm>());
+			Application.Run(_serviceProvider.GetRequiredService<MainForm>());
 
 		}
 		private static void ConfigureServices(ServiceCollection services)
@@ -49,6 +49,7 @@ namespace SchoolSchedule
 			services.AddTransient<LessonsForm>();
 			services.AddTransient<LessonForm>();
 			services.AddTransient<EditStudentForm>();
+			services.AddTransient<MainForm>();
 		}
 	}
 }

SchoolSchedule/SchoolScheduleDataBaseImplement/Implements/StudentStorage.cs

@@ -62,7 +62,7 @@ namespace SchoolScheduleDataBaseImplement.Implements
 			using var transaction = context.Database.BeginTransaction();
 			try
 			{
-				var component = context.Students.FirstOrDefault(x => x.Id ==
+				var component = context.Students.Include(x => x.Lessons).FirstOrDefault(x => x.Id ==
 		   model.Id);
 				if (component == null)
 				{

SchoolSchedule/SchoolScheduleDataBaseImplement/Models/Student.cs

@@ -72,12 +72,16 @@ namespace SchoolScheduleDataBaseImplement.Models
 
 		public void UpdateAttendance(SchoolScheduleDataBase context, StudentBindingModel model)
 		{
-			var attendance = context.LessonStudents.Where(rec => rec.StudentId == model.Id).ToList();
+			var attendance = context.LessonStudents.Where(rec => (rec.StudentId == model.Id)).ToList();
 			if (attendance != null && attendance.Count > 0)
 			{
 				context.LessonStudents.RemoveRange(attendance.Where(rec
-			   => !model.Attendance.ContainsKey(rec.Id)));
+			   => !model.Attendance.ContainsKey(rec.LessonId)));
 				context.SaveChanges();
+				foreach (var updateComponent in attendance)
+				{
+					model.Attendance.Remove(updateComponent.LessonId);
+				}
 			}
 			var student = context.Students.First(x => x.Id == Id);
 			foreach (var pc in model.Attendance)