Fix Nullable configuration in Mocha examples (#9571)

Author: glen-84

src/Mocha/examples/Demo/Demo.AppHost/Demo.AppHost.csproj

@@ -4,7 +4,6 @@
     <OutputType>Exe</OutputType>
     <AssemblyName>HotChocolate.Demo.AppHost</AssemblyName>
     <RootNamespace>HotChocolate.Demo.AppHost</RootNamespace>
-    <Nullable>enable</Nullable>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Aspire.Hosting.AppHost" />

src/Mocha/examples/Demo/Demo.Billing/Handlers/ProcessPartialRefundCommandHandler.cs

@@ -52,11 +52,8 @@ public async ValueTask<ProcessPartialRefundResponse> HandleAsync(
         refund.ProcessedAt = DateTimeOffset.UtcNow;
 
         // Update invoice status if exists - partial refund doesn't fully refund the invoice
-        if (invoice is not null)
-        {
-            // Keep invoice as Paid but we've recorded the partial refund
-            invoice.UpdatedAt = DateTimeOffset.UtcNow;
-        }
+        // Keep invoice as Paid but we've recorded the partial refund
+        invoice?.UpdatedAt = DateTimeOffset.UtcNow;
 
         await db.SaveChangesAsync(cancellationToken);
 

src/Mocha/examples/Demo/Demo.ServiceDefaults/Demo.ServiceDefaults.csproj

@@ -2,8 +2,6 @@
   <PropertyGroup>
     <AssemblyName>HotChocolate.Demo.ServiceDefaults</AssemblyName>
     <RootNamespace>HotChocolate.Demo.ServiceDefaults</RootNamespace>
-    <ImplicitUsings>enable</ImplicitUsings>
-    <Nullable>enable</Nullable>
     <IsAspireSharedProject>true</IsAspireSharedProject>
   </PropertyGroup>
   <ItemGroup>

src/Mocha/examples/Demo/Directory.Build.props

@@ -2,6 +2,7 @@
   <PropertyGroup>
     <IsPackable>false</IsPackable>
     <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 </Project>

src/Mocha/examples/ExceptionPolicies/ExceptionPolicies.csproj

@@ -2,6 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
   <ItemGroup>

src/Mocha/examples/PostgresTransport/Directory.Build.props

@@ -3,5 +3,7 @@
   <PropertyGroup>
     <TargetFramework>net10.0</TargetFramework>
     <TargetFrameworks>net10.0</TargetFrameworks>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 </Project>

src/Mocha/examples/PostgresTransport/PostgresTransport.AppHost/PostgresTransport.AppHost.csproj

@@ -3,7 +3,6 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <RootNamespace>PostgresTransport.AppHost</RootNamespace>
-    <Nullable>enable</Nullable>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Aspire.Hosting.AppHost" />

src/Mocha/examples/PostgresTransport/PostgresTransport.ServiceDefaults/PostgresTransport.ServiceDefaults.csproj

@@ -1,8 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <RootNamespace>PostgresTransport.ServiceDefaults</RootNamespace>
-    <ImplicitUsings>enable</ImplicitUsings>
-    <Nullable>enable</Nullable>
     <IsAspireSharedProject>true</IsAspireSharedProject>
   </PropertyGroup>
   <ItemGroup>