Switched central build to use choose instead of condition checks

Author: jschick04

src/Directory.Build.props

@@ -4,30 +4,36 @@
         <Nullable>enable</Nullable>  
     </PropertyGroup>
 
-    <PropertyGroup Condition="'$(UseMaui)' == 'true'">
-        <!-- <TargetFrameworks>net8.0-maccatalyst</TargetFrameworks> -->
-        <TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net9.0-windows10.0.19041.0</TargetFrameworks>
-        <!-- Uncomment to also build the tizen app. You will need to install tizen by following this: https://github.com/Samsung/Tizen.NET -->
-        <!-- <TargetFrameworks>$(TargetFrameworks);net8.0-tizen</TargetFrameworks> -->
+    <Choose>
+        <When Condition="'$(UseMaui)' == 'true'">
+            <PropertyGroup>
+                <!-- <TargetFrameworks>net8.0-maccatalyst</TargetFrameworks> -->
+                <TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net9.0-windows10.0.19041.0</TargetFrameworks>
+                <!-- Uncomment to also build the tizen app. You will need to install tizen by following this: https://github.com/Samsung/Tizen.NET -->
+                <!-- <TargetFrameworks>$(TargetFrameworks);net8.0-tizen</TargetFrameworks> -->
 
-        <!-- Note for MacCatalyst:
-            The default runtime is maccatalyst-x64, except in Release config, in which case the default is maccatalyst-x64;maccatalyst-arm64.
-            When specifying both architectures, use the plural <RuntimeIdentifiers> instead of the singular <RuntimeIdentifier>.
-            The Mac App Store will NOT accept apps with ONLY maccatalyst-arm64 indicated;
-            either BOTH runtimes must be indicated or ONLY macatalyst-x64. -->
-        <!-- For example: <RuntimeIdentifiers>maccatalyst-x64;maccatalyst-arm64</RuntimeIdentifiers> -->
-        
-        <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">14.2</SupportedOSPlatformVersion>
-        <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'maccatalyst'">14.0</SupportedOSPlatformVersion>
-        <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">24.0</SupportedOSPlatformVersion>
-        <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.19041.0</SupportedOSPlatformVersion>
-        <TargetPlatformMinVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.19041.0</TargetPlatformMinVersion>
-        <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'tizen'">6.5</SupportedOSPlatformVersion>
-    </PropertyGroup>
+                <!-- Note for MacCatalyst:
+                The default runtime is maccatalyst-x64, except in Release config, in which case the default is maccatalyst-x64;maccatalyst-arm64.
+                When specifying both architectures, use the plural <RuntimeIdentifiers> instead of the singular <RuntimeIdentifier>.
+                The Mac App Store will NOT accept apps with ONLY maccatalyst-arm64 indicated;
+                either BOTH runtimes must be indicated or ONLY macatalyst-x64. -->
+                <!-- For example: <RuntimeIdentifiers>maccatalyst-x64;maccatalyst-arm64</RuntimeIdentifiers> -->
 
-    <PropertyGroup Condition="!Exists('$(UseMaui)')">
-        <TargetFramework>net9.0-windows10.0.19041.0</TargetFramework>
-    </PropertyGroup>
+                <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">14.2</SupportedOSPlatformVersion>
+                <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'maccatalyst'">14.0</SupportedOSPlatformVersion>
+                <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">24.0</SupportedOSPlatformVersion>
+                <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.19041.0</SupportedOSPlatformVersion>
+                <TargetPlatformMinVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.19041.0</TargetPlatformMinVersion>
+                <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'tizen'">6.5</SupportedOSPlatformVersion>
+            </PropertyGroup>
+        </When>
+        
+        <Otherwise>
+            <PropertyGroup>
+                <TargetFramework>net9.0-windows10.0.19041.0</TargetFramework>
+            </PropertyGroup>
+        </Otherwise>
+    </Choose>
 
     <ItemGroup Condition="'$(IsTestProject)' == 'true'">
         <PackageReference Include="Microsoft.NET.Test.Sdk" />