using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Web.Mvc;namespace MvcSample.Extensions
{public class CommaSeparatedModelBinder : DefaultModelBinder{private static readonly MethodInfo ToArrayMethod = typeof(Enumerable).GetMethod("ToArray");public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext){return BindCsv(bindingContext.ModelType, bindingContext.ModelName, bindingContext)?? base.BindModel(controllerContext, bindingContext);}protected override object GetPropertyValue(ControllerContext controllerContext, ModelBindingContext bindingContext, System.ComponentModel.PropertyDescriptor propertyDescriptor, IModelBinder propertyBinder){return BindCsv(propertyDescriptor.PropertyType, propertyDescriptor.Name, bindingContext)?? base.GetPropertyValue(controllerContext, bindingContext, propertyDescriptor, propertyBinder);}private object BindCsv(Type type, string name, ModelBindingContext bindingContext){if (type.GetInterface(typeof(IEnumerable).Name) != null){var actualValue = bindingContext.ValueProvider.GetValue(name);if (actualValue != null){var valueType = type.GetElementType() ?? type.GetGenericArguments().FirstOrDefault();if (valueType != null && valueType.GetInterface(typeof(IConvertible).Name) != null){var list = (IList)Activator.CreateInstance(typeof(List<>).MakeGenericType(valueType));foreach (var splitValue in actualValue.AttemptedValue.Split(new[] { ',' })){if (!String.IsNullOrWhiteSpace(splitValue))list.Add(Convert.ChangeType(splitValue, valueType));}if (type.IsArray)return ToArrayMethod.MakeGenericMethod(valueType).Invoke(this, new[] { list });return list;}}}return null;}}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;namespace MvcSample.Controllers
{public class HomeController : Controller{[HttpPost]public ActionResult ModifyProduct(int productId, int newYear,[ModelBinder(typeof(CommaSeparatedModelBinder))] List<int> orderStatusIds = null){ProductInfoService.TryModifyById(productId, newYear);return Json(new { Success = true, Message = "保存成功" });}}
}