public static IObjectFieldDescriptor ResolveWith <TResolver, TResult>(
this IObjectFieldDescriptor descriptor,
Expression <Func <TResolver, Task <TResult?> > > propertyOrMethod)
{
if (descriptor is null)
{
throw new ArgumentNullException(nameof(descriptor));
}
if (propertyOrMethod is null)
{
throw new ArgumentNullException(nameof(propertyOrMethod));
}
UnaryExpression?convertedBody = Expression.Convert(propertyOrMethod.Body, typeof(object));
var newExpression = Expression.Lambda <Func <TResolver, object?> >(convertedBody,
propertyOrMethod.Parameters);
return(descriptor.ResolveWith(newExpression));
}