ASP.NET MVC 自定义模型绑定1 - 自动把以英文逗号分隔的 ID 字符串绑定成 List<int>

直接贴代码了：

CommaSeparatedModelBinder.cs

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;

        }

    }

}

客户端测试 :

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" });

        }

    }

}

谢谢浏览！

ASP.NET MVC 自定义模型绑定1 - 自动把以英文逗号分隔的 ID 字符串绑定成 List<int>的相关教程结束。