Final

ExecForm/Form1.Designer.cs

@@ -52,8 +52,10 @@
             // textBoxRange1
             // 
             textBoxRange1.Location = new Point(254, 21);
+            textBoxRange1.MaxLength = null;
+            textBoxRange1.MinLength = null;
             textBoxRange1.Name = "textBoxRange1";
-            textBoxRange1.Size = new Size(259, 66);
+            textBoxRange1.Size = new Size(259, 118);
             textBoxRange1.TabIndex = 3;
             // 
             // Form1

Library14Petrushin/ChooseList.Designer.cs

@@ -38,6 +38,7 @@
             checkedListBox1.Name = "checkedListBox1";
             checkedListBox1.Size = new Size(179, 180);
             checkedListBox1.TabIndex = 0;
+            checkedListBox1.ItemCheck += CheckedListBox1_ItemCheck;
             checkedListBox1.SelectedIndexChanged += SelectedIndexChanged;
             // 
             // ChooseList

Library14Petrushin/ChooseList.cs

@@ -49,6 +49,19 @@ namespace Library14Petrushin
         {
             SelectedValueChanged?.Invoke(this, e);
         }
+        private void CheckedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)
+        {
+            if (e.NewValue == CheckState.Checked)
+            {
+                for (int i = 0; i < checkedListBox1.Items.Count; i++)
+                {
+                    if (i != e.Index)
+                    {
+                        checkedListBox1.SetItemChecked(i, false);
+                    }
+                }
+            }
+        }
 
         public void ClearComboBox()
         {

Library14Petrushin/HierarchicalTreeView.cs

@@ -29,27 +29,21 @@ namespace Library14Petrushin
             this.alwaysNewBranch = alwaysNewBranch;
         }
 
-        public void AddObjectToTree(object obj, string stopAtProperty)
+        public void AddObjectToTree<T>(T obj, string stopAtProperty)
         {
-            TreeNode currentNode = treeView1.Nodes.Cast<TreeNode>().FirstOrDefault();
+            TreeNode currentNode = treeView1.Nodes.Count > 0 ? treeView1.Nodes[0] : treeView1.Nodes.Add("");
+
             foreach (var property in hierarchy)
             {
                 var value = obj.GetType().GetProperty(property).GetValue(obj, null).ToString();
                 bool createNewBranch = alwaysNewBranch.ContainsKey(property) && alwaysNewBranch[property];
 
-                if (currentNode == null)
-                {
-                    currentNode = treeView1.Nodes.Add(value);
-                }
-                else
-                {
                 var childNode = currentNode.Nodes.Cast<TreeNode>().FirstOrDefault(n => n.Text == value);
                 if (childNode == null || createNewBranch)
                 {
                     childNode = currentNode.Nodes.Add(value);
                 }
                 currentNode = childNode;
-                }
 
                 if (property == stopAtProperty)
                 {
@@ -73,15 +67,19 @@ namespace Library14Petrushin
             }
         }
 
-        public object GetSelectedObject()
+        public T GetSelectedObject<T>() where T : new()
         {
             if (treeView1.SelectedNode == null)
             {
-                return null;
+                throw new InvalidOperationException("Узел не выбран");
             }
 
             var node = treeView1.SelectedNode;
-            var obj = Activator.CreateInstance(typeof(Employee));
+            if (node.Nodes.Count != 0)
+            {
+                throw new InvalidOperationException("Узел не конечный, сформировать класс нельзя");
+            }
+            var obj = new T();
             foreach (var property in hierarchy)
             {
                 var value = node.Text;

Library14Petrushin/TextBoxRange.Designer.cs

@@ -29,6 +29,7 @@
         private void InitializeComponent()
         {
             textBox1 = new TextBox();
+            label1 = new Label();
             SuspendLayout();
             // 
             // textBox1
@@ -38,13 +39,23 @@
             textBox1.Size = new Size(243, 27);
             textBox1.TabIndex = 0;
             // 
+            // label1
+            // 
+            label1.AutoSize = true;
+            label1.Location = new Point(3, 54);
+            label1.Name = "label1";
+            label1.Size = new Size(50, 20);
+            label1.TabIndex = 1;
+            label1.Text = "label1";
+            // 
             // TextBoxRange
             // 
             AutoScaleDimensions = new SizeF(8F, 20F);
             AutoScaleMode = AutoScaleMode.Font;
+            Controls.Add(label1);
             Controls.Add(textBox1);
             Name = "TextBoxRange";
-            Size = new Size(252, 53);
+            Size = new Size(252, 86);
             ResumeLayout(false);
             PerformLayout();
         }
@@ -52,5 +63,6 @@
         #endregion
 
         private TextBox textBox1;
+        private Label label1;
     }
 }

Library14Petrushin/TextBoxRange.cs

@@ -13,14 +13,14 @@ namespace Library14Petrushin
 {
     public partial class TextBoxRange : UserControl
     {
-        public int MinLength { get; set; }
+        public int ?MinLength { get; set; }
-        public int MaxLength { get; set; }
+        public int ?MaxLength { get; set; }
         public event EventHandler? ValueChanged;
         public string InputValue
         {
             get
             {
-                if (MinLength == 0 && MaxLength == 0)
+                if (MinLength == null && MaxLength == null)
                 {
                     throw new RangeException("Диапазон не задан.");
                 }
@@ -32,7 +32,7 @@ namespace Library14Petrushin
             }
             set
             {
-                if (MinLength != 0 && MaxLength != 0)
+                if (MinLength != null && MaxLength != null)
                 {
                     if (value.Length >= MinLength && value.Length <= MaxLength)
                     {
@@ -40,10 +40,6 @@ namespace Library14Petrushin
                         ValueChanged?.Invoke(this, EventArgs.Empty);
                     }
                 }
-                else
-                {
-                    throw new RangeException("Диапазон не задан.");
-                }
             }
         }
         public TextBoxRange()
@@ -53,24 +49,18 @@ namespace Library14Petrushin
         }
         private void TextBox1_TextChanged(object sender, EventArgs e)
         {
-            if (MinLength != 0 && MaxLength != 0)
+            ValueChanged?.Invoke(this, e);
+            if (MinLength != null && MaxLength != null)
             {
                 if (textBox1.Text.Length < MinLength || textBox1.Text.Length > MaxLength)
                 {
-                    // Выделение текста красным цветом, если он не входит в диапазон
+                    textBox1.ForeColor = Color.Red;
-                    textBox1.ForeColor = System.Drawing.Color.Red;
                 }
                 else
                 {
-                    // Возвращение к стандартному цвету текста
+                    textBox1.ForeColor = Color.Black;
-                    textBox1.ForeColor = System.Drawing.Color.Black;
-                    ValueChanged?.Invoke(this, e);
                 }
             }
-            else
-            {
-                throw new RangeException("Диапазон не задан.");
-            }
         }
 
     }