first commit

.gitignore

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+.vs
+bin
+obj

App.xaml

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+<Application x:Class="TestOP.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:TestOP"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>

App.xaml.cs

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+using System.Configuration;
+using System.Data;
+using System.Windows;
+
+namespace TestOP
+{
+	/// <summary>
+	/// Interaction logic for App.xaml
+	/// </summary>
+	public partial class App : Application
+	{
+	}
+
+}

AssemblyInfo.cs

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+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)
+)]

MainWindow.xaml

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+<Window x:Class="TestOP.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"
+        xmlns:local="clr-namespace:TestOP"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="800">
+    <Grid>
+
+    </Grid>
+</Window>

MainWindow.xaml.cs

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+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 TestOP
+{
+	/// <summary>
+	/// Interaction logic for MainWindow.xaml
+	/// </summary>
+	public partial class MainWindow : Window
+	{
+		public MainWindow()
+		{
+			InitializeComponent();
+		}
+	}
+}

TestOP.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+
+</Project>

TestOP.csproj.user

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup />
+  <ItemGroup>
+    <ApplicationDefinition Update="App.xaml">
+      <SubType>Designer</SubType>
+    </ApplicationDefinition>
+  </ItemGroup>
+  <ItemGroup>
+    <Page Update="MainWindow.xaml">
+      <SubType>Designer</SubType>
+    </Page>
+  </ItemGroup>
+</Project>

TestOP.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.9.34607.119
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TestOP", "TestOP.csproj", "{B022994C-9E5F-44D5-A0B5-26A1B8DF9A65}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{B022994C-9E5F-44D5-A0B5-26A1B8DF9A65}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B022994C-9E5F-44D5-A0B5-26A1B8DF9A65}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B022994C-9E5F-44D5-A0B5-26A1B8DF9A65}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B022994C-9E5F-44D5-A0B5-26A1B8DF9A65}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {8735F86C-7520-47A7-A8AD-C6DA3E750384}
+	EndGlobalSection
+EndGlobal