ASP.NET MVC 下自定义模型绑定，去除字符串类型前后的空格

直接贴代码了：

SkyModelBinder.cs

using System.ComponentModel;
using System.Linq;
using System.Web.Mvc;

namespace MvcSample.Extensions
{
    public class SkyModelBinder : DefaultModelBinder
    {
        public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
        {
            var model = base.BindModel(controllerContext, bindingContext);
            if (model is BaseSkyViewModel)
            {
                ((BaseSkyViewModel)model).BindModel(controllerContext, bindingContext);
            }
            return model;
        }

        protected override void SetProperty(ControllerContext controllerContext, ModelBindingContext bindingContext,
            PropertyDescriptor propertyDescriptor, object value)
        {
            //check if data type of value is System.String
            if (propertyDescriptor.PropertyType == typeof(string))
            {
                //developers can mark properties to be excluded from trimming with [NoTrim] attribute
                if (propertyDescriptor.Attributes.Cast<object>().All(a => a.GetType() != typeof (NoTrimAttribute)))
                {
                        var stringValue = (string)value;
                        value = string.IsNullOrEmpty(stringValue) ? stringValue : stringValue.Trim();
                }
            }

            base.SetProperty(controllerContext, bindingContext, propertyDescriptor, value);
        }
    }
}

BaseSkyViewModel.cs

using System.Collections.Generic;
using System.Web.Mvc;

namespace MvcSample.Extensions
{
    /// <summary>
    /// Base sky view model
    /// </summary>
    [ModelBinder(typeof(SkyModelBinder))]
    public partial class BaseSkyViewModel
    {
        public BaseSkyViewModel()
        {
            this.CustomProperties = new Dictionary<string, object>();
            PostInitialize();
        }

        public virtual void BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
        {
        }

        /// <summary>
        /// Developers can override this method in custom partial classes
        /// in order to add some custom initialization code to constructors
        /// </summary>
        protected virtual void PostInitialize()
        {
            
        }

        /// <summary>
        /// Use this property to store any custom value for your models. 
        /// </summary>
        public Dictionary<string, object> CustomProperties { get; set; }
    }

    /// <summary>
    /// Base Sky entity model
    /// </summary>
    public partial class BaseSkyEntityViewModel : BaseSkyViewModel
    {
        public virtual int Id { get; set; }
    }
}

NoTrimAttribute.cs

using System;

namespace MvcSample.Extensions
{
    /// <summary>
    /// Attribute indicating that entered values should not be trimmed
    /// </summary>
    public class NoTrimAttribute : Attribute
    {
    }
}

DEMO

ProductInfoModifyViewModel.cs

using MvcSample.Extensions;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace MvcSample.Models
{
    public class ProductInfoModifyViewModel : BaseSkyViewModel
    {
        public int ProductId { get; set; }

        /// <summary>
        /// 假设有一个这个 Property
        /// </summary>
        public string ProductName { get; set; }

        public int NewYear { get; set; }
    }
}

HomeController.cs

using MvcSample.Extensions;
using MvcSample.Models;
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(ProductInfoModifyViewModel viewModel,
            [ModelBinder(typeof(CommaSeparatedModelBinder))] List<int> orderStatusIds = null)
        {
            ProductInfoService.TryModifyById(viewModel.ProductId, viewModel.NewYear);
            return Json(new { Success = true, Message = "保存成功" });
        }
    }
}

运行截图：

图2：

谢谢浏览！