Code/SboxSuperuser/Engine/CommandDiscovery/HandlerSignature9.cs

A generic handler signature validator for command methods with nine parameters. It checks that a MethodDescription can be bound to either a Func<T1..T9, CommandResult> or an async Func<T1..T9, Task<CommandResult>> delegate by attempting to create the delegate without invoking it.

Reflection
namespace SboxSuperuser.Engine.CommandDiscovery;

internal sealed class HandlerSignature9<T1, T2, T3, T4, T5, T6, T7, T8, T9> : IHandlerSignature
{
	/// <summary>Checks closed delegate binding without executing the handler.</summary>
	public void Validate( Sandbox.MethodDescription method )
	{
		if ( method.ReturnType == typeof( CommandResult ) )
		{
			_ = method.CreateDelegate<Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, CommandResult>>();
		}
		else
		{
			_ = method.CreateDelegate<Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, Task<CommandResult>>>();
		}
	}
}