diff --git a/WPF控件-12-多文本/App.xaml b/WPF控件-12-多文本/App.xaml
new file mode 100644
index 0000000..d272fa2
--- /dev/null
+++ b/WPF控件-12-多文本/App.xaml
@@ -0,0 +1,9 @@
+<Application x:Class="WPF控件_12_多文本.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:WPF控件_12_多文本"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>
diff --git a/WPF控件-12-多文本/App.xaml.cs b/WPF控件-12-多文本/App.xaml.cs
new file mode 100644
index 0000000..ce7df0a
--- /dev/null
+++ b/WPF控件-12-多文本/App.xaml.cs
@@ -0,0 +1,12 @@
+using System.Configuration;
+using System.Data;
+using System.Windows;
+
+namespace WPF控件_12_多文本;
+
+/// <summary>
+/// Interaction logic for App.xaml
+/// </summary>
+public partial class App : Application
+{
+}
\ No newline at end of file
diff --git a/WPF控件-12-多文本/AssemblyInfo.cs b/WPF控件-12-多文本/AssemblyInfo.cs
new file mode 100644
index 0000000..4a05c7d
--- /dev/null
+++ b/WPF控件-12-多文本/AssemblyInfo.cs
@@ -0,0 +1,10 @@
+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+    //(used if a resource is not found in the page,
+    // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+    //(used if a resource is not found in the page,
+    // app, or any theme specific resource dictionaries)
+)]
\ No newline at end of file
diff --git a/WPF控件-12-多文本/MainWindow.xaml b/WPF控件-12-多文本/MainWindow.xaml
new file mode 100644
index 0000000..e7bbfab
--- /dev/null
+++ b/WPF控件-12-多文本/MainWindow.xaml
@@ -0,0 +1,32 @@
+<Window x:Class="WPF控件_12_多文本.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        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"
+        Icon="public/003540AH4M72.jpg"
+        mc:Ignorable="d"
+        Title="WPF控件_12_多文本" Height="450" Width="800">
+    <ScrollViewer>
+        <StackPanel>
+            <Label>
+                RichTextBox
+            </Label>
+            <RichTextBox MinHeight="150" AutoWordSelection="True" />
+
+            <Label>
+                TextBox
+            </Label>
+            <TextBox Name="TextBox" MaxLength="199" TextWrapping="Wrap" MaxLines="2" MinHeight="150"
+                     AcceptsReturn="True" AcceptsTab="True" AutoWordSelection="True"
+                     MouseDoubleClick="TextBox_OnMouseDoubleClick" SelectionChanged="TextBox_OnSelectionChanged">
+                AcceptsReturn="True" (通常情况按下回车会触发默认按钮)   AcceptsTab="True" (不会出现焦点现象跳转到下一个控件中)
+
+            </TextBox>
+
+            <Label>
+                PasswordBox
+            </Label>
+            <PasswordBox Margin="0 0 0 50" MinHeight="150" />
+        </StackPanel>
+    </ScrollViewer>
+</Window>
\ No newline at end of file
diff --git a/WPF控件-12-多文本/MainWindow.xaml.cs b/WPF控件-12-多文本/MainWindow.xaml.cs
new file mode 100644
index 0000000..f6c456d
--- /dev/null
+++ b/WPF控件-12-多文本/MainWindow.xaml.cs
@@ -0,0 +1,25 @@
+using System.Windows;
+using System.Windows.Input;
+
+namespace WPF控件_12_多文本;
+
+/// <summary>
+///     Interaction logic for MainWindow.xaml
+/// </summary>
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+
+    private void TextBox_OnMouseDoubleClick(object sender, MouseButtonEventArgs e)
+    {
+        Console.WriteLine($"有多少行：{TextBox.LineCount}");
+    }
+
+    private void TextBox_OnSelectionChanged(object sender, RoutedEventArgs e)
+    {
+        Console.WriteLine(TextBox.SelectedText);
+    }
+}
\ No newline at end of file
diff --git a/WPF控件-12-多文本/WPF控件-12-多文本.csproj b/WPF控件-12-多文本/WPF控件-12-多文本.csproj
new file mode 100644
index 0000000..de5c9e2
--- /dev/null
+++ b/WPF控件-12-多文本/WPF控件-12-多文本.csproj
@@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>WinExe</OutputType>
+        <TargetFramework>net8.0-windows</TargetFramework>
+        <RootNamespace>WPF控件_12_多文本</RootNamespace>
+        <Nullable>enable</Nullable>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <UseWPF>true</UseWPF>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <Resource Include="public\003540AH4M72.jpg">
+            <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+        </Resource>
+    </ItemGroup>
+
+</Project>
diff --git a/WPF控件-12-多文本/public/003540AH4M72.jpg b/WPF控件-12-多文本/public/003540AH4M72.jpg
new file mode 100644
index 0000000..4aa96ac
Binary files /dev/null and b/WPF控件-12-多文本/public/003540AH4M72.jpg differ
diff --git a/WPF控件.sln b/WPF控件.sln
index 9ea711d..ee4841b 100644
--- a/WPF控件.sln
+++ b/WPF控件.sln
@@ -26,6 +26,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WPF控件-11-Expander", "WP
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WPF控件-11-Expander2", "WPF控件-11-Expander2\WPF控件-11-Expander2.csproj", "{0D2CEE95-6B52-4D7D-B001-ED6AB4262875}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WPF控件-12-多文本", "WPF控件-12-多文本\WPF控件-12-多文本.csproj", "{45A695BD-4B02-47F4-8598-144E882A8CF6}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -84,5 +86,9 @@ Global
 		{0D2CEE95-6B52-4D7D-B001-ED6AB4262875}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{0D2CEE95-6B52-4D7D-B001-ED6AB4262875}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{0D2CEE95-6B52-4D7D-B001-ED6AB4262875}.Release|Any CPU.Build.0 = Release|Any CPU
+		{45A695BD-4B02-47F4-8598-144E882A8CF6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{45A695BD-4B02-47F4-8598-144E882A8CF6}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{45A695BD-4B02-47F4-8598-144E882A8CF6}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{45A695BD-4B02-47F4-8598-144E882A8CF6}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 EndGlobal