/// <summary>
/// Returns true if the parameter is able to provide a value to a particular site.
/// </summary>
/// <param name="pi">Constructor, method, or property-mutator parameter.</param>
/// <param name="context">The component context in which the value is being provided.</param>
/// <param name="valueProvider">If the result is true, the valueProvider parameter will
/// be set to a function that will lazily retrieve the parameter value. If the result is false,
/// will be set to null.</param>
/// <returns>True if a value can be supplied; otherwise, false.</returns>
/// <exception cref="System.ArgumentNullException">
/// Thrown if <paramref name="pi" /> or <paramref name="context" /> is <see langword="null" />.
/// </exception>
public override bool CanSupplyValue(ParameterInfo pi, IResolveContext context, [NotNullWhen(returnValue: true)] out Func <object?>?valueProvider)
{
if (pi == null)
{
throw new ArgumentNullException(nameof(pi));
}
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
var service = new TypedService(pi.ParameterType);
if (context.ComponentRegistry.TryGetServiceRegistration(service, out var implementation))
{
valueProvider = () => context.ResolveComponent(new ResolveRequest(service, implementation, Enumerable.Empty <Parameter>()));
return(true);
}
valueProvider = null;
return(false);
}
