[Interface2NullObject]Replace default-part 4

So for https://github.com/ignatandrei/rscg_Interface_to_null_object we put the default return value as the default for the return type. For properties, it is enough easy to modify the data.  But for functions ?  Let’s say we return an array

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public IEmployee[] Employees();

The default value is null – so it will be throwing an error when do “foreach ” .

So – I should think about a way to register default values for different methods.
I have the idea to register into the .csproj – so here it is

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<ItemGroup>
    <CompilerVisibleProperty Include="I2NO_String" />
    <CompilerVisibleProperty Include="I2NO_IntegrationConsole_IEmployee_Array" />
    <CompilerVisibleProperty Include="I2NO_System_Collections_Generic_IAsyncEnumerable_Of_IntegrationConsole_IEmployee_EndOf" />
</ItemGroup>
<ItemGroup>
  <PackageReference Include="System.Linq.Async" Version="6.0.1" />
</ItemGroup>
<PropertyGroup>
    <I2NO_String>return ""</I2NO_String>
    <I2NO_IntegrationConsole_IEmployee_Array>return []</I2NO_IntegrationConsole_IEmployee_Array>
    <I2NO_System_Collections_Generic_IAsyncEnumerable_Of_IntegrationConsole_IEmployee_EndOf>return AsyncEnumerable.Empty_Of_IntegrationConsole.IEmployee_EndOf();</I2NO_System_Collections_Generic_IAsyncEnumerable_Of_IntegrationConsole_IEmployee_EndOf>
</PropertyGroup>

So this is the result

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public virtual string Name { get; set; } = default(string);
 
public virtual IntegrationConsole.IEmployee[] Employees() {  return [] ; }
 
public virtual System.Collections.Generic.IAsyncEnumerable<IntegrationConsole.IEmployee> EmployeesAsync() {  return AsyncEnumerable.Empty<IntegrationConsole.IEmployee>() ; }