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+    },
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+    }
+  ],
   "DocumentGroupContainers": [
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@@ -9,11 +42,112 @@
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+          "SelectedChildIndex": 8,
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+              "ToolTip": "C:\\Users\\VivoBook 15X\\Desktop\\\u043F\u0440\u043E\u0433\u0440\u0430\u043C\u043C\u043D\u044B\u0435 \u043C\u043E\u0434\u0443\u043B\u0438\\demo-validation\\avalonia_code\\\u041C\u043E\u0439 \u043F\u0440\u043E\u0435\u043A\u0442\\Demo_Validation\\App.axaml",
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AddItem.axaml

@@ -0,0 +1,16 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:model="using:AvaloniaValidationSample"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="AvaloniaValidationSample.AddItem"
+        x:DataType="model:Item"
+        Title="AddItem">
+	<StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
+		<TextBlock Text="Password"/>
+		<TextBox Text="{Binding Password}"></TextBox>
+		<TextBlock Text="Text"/>
+		<TextBox Text="{Binding Text}"></TextBox>
+	</StackPanel>
+</Window>

AddItem.axaml.cs

@@ -0,0 +1,14 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace AvaloniaValidationSample;
+
+public partial class AddItem : Window
+{
+    public AddItem()
+    {
+        InitializeComponent();
+        DataContext = new Item();
+    }
+}

App.axaml

@@ -1,6 +1,6 @@
 <Application xmlns="https://github.com/avaloniaui"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             x:Class="Demo_Validation.App"
+             x:Class="AvaloniaValidationSample.App"
              RequestedThemeVariant="Default">
 	<!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
 
@@ -8,3 +8,4 @@
 		<FluentTheme />
 	</Application.Styles>
 </Application>
+

App.axaml.cs

@@ -2,7 +2,7 @@ using Avalonia;
 using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Markup.Xaml;
 
-namespace Demo_Validation;
+namespace AvaloniaValidationSample;
 
 public partial class App : Application
 {

Item.cs

@@ -0,0 +1,28 @@
+using System;
+
+namespace AvaloniaValidationSample;
+
+public class Item
+{
+    public int Id { get; set; }
+    private string _Password { get; set; }
+    public string Password
+    {
+        get => _Password;
+        set
+        {
+            validatePassword(value);
+            _Password = value;
+        }
+    }
+
+    public string Text { get; set; }
+
+    private void validatePassword(string password)
+    {
+        if (password.Length < 3)
+        {
+            throw new ArgumentException(nameof(password), "Password length > 7 symbols");
+        }
+    }
+}

MainWindow.axaml

@@ -3,7 +3,24 @@
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
-        x:Class="Demo_Validation.MainWindow"
+        x:Class="AvaloniaValidationSample.MainWindow"
-        Title="Demo_Validation">
+        x:CompileBindings="False"
-    Welcome to Avalonia!
+        Title="AvaloniaValidationSample">
+	<DockPanel>
+		<StackPanel Orientation="Horizontal" DockPanel.Dock="Top">
+			<Button Content="Add item" Click="AddItem_OnClick"/>
+		</StackPanel>
+		<ListBox x:Name="ItemsListBox">
+			<ListBox.ItemTemplate>
+				<DataTemplate>
+					<StackPanel>
+						<TextBox Text="{Binding Id}"/>
+						<TextBox Text="{Binding Password}"/>
+						<TextBox Text="{Binding Text}"/>
+
+					</StackPanel>
+				</DataTemplate>
+			</ListBox.ItemTemplate>
+		</ListBox>
+	</DockPanel>
 </Window>

MainWindow.axaml.cs

@@ -1,11 +1,44 @@
+using System.Collections.Generic;
 using Avalonia.Controls;
+using Avalonia.Interactivity;
 
-namespace Demo_Validation;
+namespace AvaloniaValidationSample;
 
 public partial class MainWindow : Window
 {
     public MainWindow()
     {
         InitializeComponent();
+        var listItem = new List<AvaloniaValidationSample.Item>()
+        {
+            new AvaloniaValidationSample.Item()
+            {
+                Id = 1,
+                Password = "123",
+                Text = "12345"
+            },new AvaloniaValidationSample.Item()
+            {
+                Id = 1,
+                Password = "123",
+                Text = "12345"
+            },new AvaloniaValidationSample.Item()
+            {
+                Id = 2,
+                Password = "333",
+                Text = "55"
+            },new AvaloniaValidationSample.Item()
+            {
+                Id = 3,
+                Password = "444",
+                Text = "66"
+            },
+
+        };
+        ItemsListBox.ItemsSource = listItem;
+    }
+
+    private void AddItem_OnClick(object? sender, RoutedEventArgs e)
+    {
+        new AddItem().ShowDialog(this);
     }
 }

Program.cs

@@ -1,7 +1,7 @@
 using Avalonia;
 using System;
 
-namespace Demo_Validation;
+namespace AvaloniaValidationSample;
 
 class Program
 {

obj/Debug/net9.0/Avalonia/Resources.Inputs.cache

@@ -1 +1 @@
-dd64ce1bf974013d2fd2483fc6b3e66e42525debc273b6680b16405ef9f388b0
+961a53ea5960268cb8e532ad2e8b7f3116b957a8f7dd43d10c2a2f7256bca64a

obj/Debug/net9.0/Demo_Validation.AssemblyInfo.cs

@@ -14,7 +14,7 @@ using System.Reflection;
 [assembly: System.Reflection.AssemblyCompanyAttribute("Demo_Validation")]
 [assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
 [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
-[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+a0fa4d6d8e25a915ecdd20c80438b32b6587b197")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+148407e624aefa6cee18e1b9ad0618e0c91563e6")]
 [assembly: System.Reflection.AssemblyProductAttribute("Demo_Validation")]
 [assembly: System.Reflection.AssemblyTitleAttribute("Demo_Validation")]
 [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]

obj/Debug/net9.0/Demo_Validation.AssemblyInfoInputs.cache

@@ -1 +1 @@
-74743ef687afd9e597cbd72df44461574d46a6967c7658db37756aae444ea8bc
+e09ab7b1f72773dd475f4bb5961eeed4347dd180327e1b77cb3455d8d08dd2b9

obj/Debug/net9.0/Demo_Validation.GeneratedMSBuildEditorConfig.editorconfig

@@ -21,6 +21,9 @@ build_property.EnableGeneratedComInterfaceComImportInterop =
 build_property.EffectiveAnalysisLevelStyle = 9.0
 build_property.EnableCodeStyleSeverity = 
 
+[C:/Users/VivoBook 15X/Desktop/программные модули/demo-validation/avalonia_code/Мой проект/Demo_Validation/AddItem.axaml]
+build_metadata.AdditionalFiles.SourceItemGroup = AvaloniaXaml
+
 [C:/Users/VivoBook 15X/Desktop/программные модули/demo-validation/avalonia_code/Мой проект/Demo_Validation/App.axaml]
 build_metadata.AdditionalFiles.SourceItemGroup = AvaloniaXaml
 

obj/Debug/net9.0/Demo_Validation.csproj.CoreCompileInputs.cache

@@ -1 +1 @@
-9fe313c2ec25cd8d4df8972d36092840e2b409a759b3acd404e8d35474603af5
+ecaa10ead68b32291664d2a841309026e6d387d6eab5b3ad150342d54d342e10