添加项目文件。

Directory.Build.props

@@ -0,0 +1,24 @@
+<Project>
+
+	<!-- See https://aka.ms/dotnet/msbuild/customize for more details on customizing your build -->
+	<PropertyGroup>
+		<DefaultTargetFramework>net8.0</DefaultTargetFramework>
+		<TargetFramework>$(DefaultTargetFramework)-windows</TargetFramework>
+		<LangVersion>12.0</LangVersion>
+		<SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings>
+		<CheckEolTargetFramework>false</CheckEolTargetFramework>
+		<SuppressNETCoreSdkPreviewMessage>true</SuppressNETCoreSdkPreviewMessage>
+		<Nullable>annotations</Nullable>
+		<NoWarn>CS1591</NoWarn>
+		<ImplicitUsings>enable</ImplicitUsings>
+	</PropertyGroup>
+
+
+	<ItemGroup>
+		<PackageReference Include="PolySharp" Version="1.16.0">
+			<PrivateAssets>all</PrivateAssets>
+			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+		</PackageReference>
+	</ItemGroup>
+
+</Project>