diff --git a/WPF控件-3-内容原则/App.xaml b/WPF控件-3-内容原则/App.xaml
new file mode 100644
index 0000000..2d8ace2
--- /dev/null
+++ b/WPF控件-3-内容原则/App.xaml
@@ -0,0 +1,9 @@
+<Application x:Class="WPF控件_3_内容原则.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_3_内容原则"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>
diff --git a/WPF控件-3-内容原则/App.xaml.cs b/WPF控件-3-内容原则/App.xaml.cs
new file mode 100644
index 0000000..0b0182a
--- /dev/null
+++ b/WPF控件-3-内容原则/App.xaml.cs
@@ -0,0 +1,12 @@
+using System.Configuration;
+using System.Data;
+using System.Windows;
+
+namespace WPF控件_3_内容原则;
+
+/// <summary>
+/// Interaction logic for App.xaml
+/// </summary>
+public partial class App : Application
+{
+}
\ No newline at end of file
diff --git a/WPF控件-3-内容原则/AssemblyInfo.cs b/WPF控件-3-内容原则/AssemblyInfo.cs
new file mode 100644
index 0000000..4a05c7d
--- /dev/null
+++ b/WPF控件-3-内容原则/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-3-内容原则/MainWindow.xaml b/WPF控件-3-内容原则/MainWindow.xaml
new file mode 100644
index 0000000..9c8a011
--- /dev/null
+++ b/WPF控件-3-内容原则/MainWindow.xaml
@@ -0,0 +1,17 @@
+<Window x:Class="WPF控件_3_内容原则.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"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="800">
+    <StackPanel>
+        <Button Margin="3">
+            <Grid>
+                <Polygon Points="100,25 100,0 200,25 125,50" Fill="LightBlue" />
+                <Polygon Points="100,25 75,0 0,25 75,50" Fill="White" />
+            </Grid>
+        </Button>
+    </StackPanel>
+
+</Window>
\ No newline at end of file
diff --git a/WPF控件-3-内容原则/MainWindow.xaml.cs b/WPF控件-3-内容原则/MainWindow.xaml.cs
new file mode 100644
index 0000000..1e4d31f
--- /dev/null
+++ b/WPF控件-3-内容原则/MainWindow.xaml.cs
@@ -0,0 +1,23 @@
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace WPF控件_3_内容原则;
+
+/// <summary>
+/// Interaction logic for MainWindow.xaml
+/// </summary>
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+}
\ No newline at end of file
diff --git a/WPF控件-3-内容原则/WPF控件-3-内容原则.csproj b/WPF控件-3-内容原则/WPF控件-3-内容原则.csproj
new file mode 100644
index 0000000..28000bb
--- /dev/null
+++ b/WPF控件-3-内容原则/WPF控件-3-内容原则.csproj
@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>WinExe</OutputType>
+        <TargetFramework>net8.0-windows</TargetFramework>
+        <RootNamespace>WPF控件_3_内容原则</RootNamespace>
+        <Nullable>enable</Nullable>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <UseWPF>true</UseWPF>
+    </PropertyGroup>
+
+</Project>
diff --git a/WPF控件.sln b/WPF控件.sln
index ae13073..5e71e2d 100644
--- a/WPF控件.sln
+++ b/WPF控件.sln
@@ -4,6 +4,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WPF控件-1-设置颜色",
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WPF控件-2-鼠标光标", "WPF控件-2-鼠标光标\WPF控件-2-鼠标光标.csproj", "{C4F2DF6D-2982-419E-8027-CCAD24BC9A4F}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WPF控件-3-内容原则", "WPF控件-3-内容原则\WPF控件-3-内容原则.csproj", "{AFDCB2E1-2BBF-4554-8673-BA92F5FD4D3C}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -18,5 +20,9 @@ Global
 		{C4F2DF6D-2982-419E-8027-CCAD24BC9A4F}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{C4F2DF6D-2982-419E-8027-CCAD24BC9A4F}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{C4F2DF6D-2982-419E-8027-CCAD24BC9A4F}.Release|Any CPU.Build.0 = Release|Any CPU
+		{AFDCB2E1-2BBF-4554-8673-BA92F5FD4D3C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{AFDCB2E1-2BBF-4554-8673-BA92F5FD4D3C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{AFDCB2E1-2BBF-4554-8673-BA92F5FD4D3C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{AFDCB2E1-2BBF-4554-8673-BA92F5FD4D3C}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 EndGlobal