Open
Description
openedon May 5, 2024
Background and motivation
The arguments passed to CreateFactory and ObjectFactory are usually of a fixed number so it may be worthwhile to consider params span for both instead of array.
API Proposal
I haven't seen an addition like this so far so I'm not sure about the naming convention.
namespace Microsoft.Extensions.DependencyInjection
{
public delegate T ObjectFactoryWithParams<out T>(IServiceProvider serviceProvider, params ReadOnlySpan<object?> arguments);
public static class ActivatorUtilities
{
public static ObjectFactoryWithParams<T> CreateFactory2<T>(params ReadOnlySpan<Type> argumentTypes)
}
}API Usage
var factory = ActivatorUtilities.CreateFactory<T>(typeof(SomeType));
var result = factory(serviceProvider, new SomeType());Alternative Designs
An alternative is to consider making the return type a generic delegate over argument types.
public static ObjectFactory<TArg1, T> CreateFactory<T, TArg1>();
public static ObjectFactory<TArg1, TArg2, T> CreateFactory<T, TArg1, TArg2>();
// etcpublic delegate T ObjectFactory<in TArg1, out T>(IServiceProvider serviceProvider, TArg1? arg1);
public delegate T ObjectFactory<in TArg1, in TArg2, out T>(IServiceProvider serviceProvider, TArg1? arg1, TArg2? arg2);
// etcvar factory = ActivatorUtilities.CreateFactory<T, SomeType>();
var result = factory(serviceProvider, new SomeType());Risks
No response
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