An ASP.NET MVC ModelBinder for binding form values of the form name[].property rather than name[index].property. Assumes form values are POSTed in markup order, unsure if this is always true.

IndexlessEnumerableModelBinder.cs

public class IndexlessEnumerableModelBinder<TItemType> : DefaultModelBinder
        where TItemType : class
    {
        protected override void BindProperty(ControllerContext controllerContext, ModelBindingContext bindingContext, PropertyDescriptor propertyDescriptor)
        {
            if (typeof(IEnumerable<TItemType>).IsAssignableFrom(propertyDescriptor.PropertyType))
            {
                var nameOfPropertyToBind = propertyDescriptor.Name;

                var form = controllerContext.HttpContext.Request.Form;
                var result = new List<TItemType>();
                foreach (var key in form.AllKeys)
                {
                    var matches = Regex.Matches(key, string.Format(@"^{0}\[\]\.(\w+)", nameOfPropertyToBind));

                    if (matches.Count > 0)
                    {
                        var propertyName = matches[0].Groups[1].Value;
                        var propertyInfo = typeof (TItemType).GetProperty(propertyName);
                        if (propertyInfo == null)
                        {
                            continue;
                        }

                        var values = bindingContext.ValueProvider.GetValue(key).ConvertTo(propertyInfo.PropertyType.MakeArrayType()) as IEnumerable;

                        if (values == null)
                        {
                            continue;
                        }

                        var index = 0;
                        foreach (var value in values)
                        {
                            if (result.Count <= index)
                            {
                                result.Add(Activator.CreateInstance<TItemType>());
                            }
                            propertyInfo.SetValue(result[index], value, null);
                            index++;
                        }
                    }
                }

                SetProperty(controllerContext, bindingContext, propertyDescriptor, result);

                return;
            }

            base.BindProperty(controllerContext, bindingContext, propertyDescriptor);
        }
    }

Great :)

Might want to show how to apply this in an MVC app? Or at least reference a link maybe?

Might want to show how to apply this in an MVC app? Or at least reference a link maybe?

Classic .NET? Look at https://www.codeproject.com/Articles/605595/ASP-NET-MVC-Custom-Model-Binder

.NET Core?
https://docs.microsoft.com/en-us/aspnet/core/mvc/advanced/custom-model-binding?view=aspnetcore-5.0