c# – MVC3 LowerCase路由值的行为与UpperCase不同？

概述在这里为很多代码道歉……我试图尽可能地保持它： 我写了(主要是从这里偷来的)一个HtmlHelper扩展来写出一个基于枚举的RadioButton(分组).我还设置了路线图,因此它使用枚举而不是“id”等. 我有两个枚举(对于此示例)CurrencyType和StatusType 当我调用URL / GBP / Open时,我的HtmlHelper正常工作并设置单选按钮的值,并选中GBP和Open 在这里为很多代码道歉……我试图尽可能地保持它：

我写了(主要是从这里偷来的)一个HtmlHelper扩展来写出一个基于枚举的Radiobutton(分组).我还设置了路线图,因此它使用枚举而不是“ID”等.

我有两个枚举(对于此示例)CurrencyType和StatusType

当我调用URL / GBP / Open时,我的HTMLHelper正常工作并设置单选按钮的值,并选中GBP和Open.

当我调用URL / gbp / open时 – Helper仍会检查值并且似乎工作…但是当调用Radiobutton().ToHTMLString()时,“checked”不存在????
使用默认路由,单选按钮仍然正确设置???

如果您断开返回的SelectList,那么您可以看到所选的选项设置正确,所以我对问题出现的地方有点难过？

Empty MVC3 website called Area36...Area 51 was taken ;)using System;using System.Collections.Generic;using System.linq;using System.Web;using System.Web.Mvc;using System.Web.Mvc.HTML;using System.linq.Expressions;using System.Text;namespace Area36.Models{    public static class Extensions    {        public static SelectList ToSelectList<TEnum>(this TEnum enumObj)        {            var values = from TEnum e in Enum.GetValues(typeof(TEnum))                         select new { ID = e,name = e };            return new SelectList(values,"ID","name",enumObj);        }        public static voID AppendFormatline(this StringBuilder sb,string format,params object[] args)        {            sb.AppendFormat(format,args);            sb.Appendline();        }        public static MvcHTMLString RadiobuttonForEnum<TModel,TProperty>(this HTMLHelper<TModel> HTMLHelper,Expression<Func<TModel,TProperty>> Expression,string fIEldSet)        {            var MetaData = ModelMetadata.FromLambdaExpression(Expression,HTMLHelper.VIEwData);            var e = (TProperty)Enum.Parse(typeof(TProperty),MetaData.Model.ToString());            var selectList = e.ToSelectList();            var sb = new StringBuilder();            if (selectList != null)            {                sb.AppendFormatline("<fIEldset><legend>{0}</legend>",fIEldSet);                foreach (SelectListItem item in selectList)                {                    var ID = string.Format("{0}_{1}",MetaData.Propertyname,item.Value);                    if (HTMLHelper.VIEwData.TemplateInfo.HTMLFIEldPrefix != string.Empty)                        ID.Insert(0,string.Format("{0}_",HTMLHelper.VIEwData.TemplateInfo.HTMLFIEldPrefix));                    var label = HTMLHelper.Label(ID,httpUtility.HTMLEncode(item.Text));                    var radio = HTMLHelper.Radiobutton(name: MetaData.Propertyname,value: item.Value,isChecked: item.Selected,HTMLAttributes: new { ID = ID }).ToHTMLString();                    sb.AppendFormatline("<div class=\"radio_{0}\">{1}{2}</div>",radio,label);                }                sb.Appendline("</fIEldset>");            }            return MvcHTMLString.Create(sb.ToString());        }    }}

using System;using System.Collections.Generic;using System.linq;using System.Web;using System.Web.Mvc;using Area36.Models;namespace Area36.Controllers{    public class HomeController : Controller    {        //        // GET: /Home/        public ActionResult Index(CurrencyType currency,StatusType status)        {            return VIEw(new viewmodel { Currency = currency,Status = status });        }    }}

using System;using System.Collections.Generic;using System.linq;using System.Web;namespace Area36.Models{    public class viewmodel    {        public CurrencyType Currency { get; set; }        public StatusType Status { get; set; }    }}

@using Area36.Models@model Area36.Models.viewmodel@{    VIEwBag.Title = "Index";}<h2>Index</h2>@HTML.RadiobuttonForEnum(m => m.Currency,"Currency")@HTML.RadiobuttonForEnum(m => m.Status,"Status")

public static voID RegisterRoutes(RouteCollection routes)        {            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");            routes.MapRoute(                "Default",// Route name                "{currency}/{status}",// URL with parameters                new { controller = "Home",action = "Index",currency = CurrencyType.EUR,status = StatusType.Closed} // Parameter defaults            );        }

解决方法 我尝试了各种方案来解决这个问题.强有力地传递了UpperCase值.最令人惊讶的是,当我为所有单选按钮传递’true’时,如下所示,即使输出相同,也只检查按钮的大写url.

var radio = HTMLHelper.Radiobutton(MetaData.Propertyname,item.Value,true,new { ID = ID }).ToHTMLString();

随着一些rnd与这个代码和一些谷歌搜索我发现this.
如果你检查
以下是MVC3-rtm的代码.在这里你可以看到isChecked的值是根据ModelState修改的,如果在调试模式下检查modelState.Values [index] .AttemptedValue的值,它显然是小写的(对于“gbp / open”).这就是小写url不呈现checked属性的原因.

private IHTMLString buildradiobutton(string name,object value,bool? isChecked,IDictionary<string,object> attributes) {        string valueString = ConvertTo(value,typeof(string)) as string;        TagBuilder builder = new TagBuilder("input");        builder.MergeAttribute("type","radio",true);        builder.GenerateID(name);        builder.MergeAttributes(attributes,replaceExisting: true);        builder.MergeAttribute("value",valueString,replaceExisting: true);        builder.MergeAttribute("name",name,replaceExisting: true);        var modelState = ModelState[name];        string modelValue = null;        if (modelState != null) {            modelValue = ConvertTo(modelState.Value,typeof(string)) as string;            isChecked = isChecked ?? String.Equals(modelValue,StringComparison.OrdinalignoreCase);        }        if (isChecked.HasValue) {            // OverrIDes attribute values            if (isChecked.Value) {                builder.MergeAttribute("checked","checked",true);            }            else {                builder.Attributes.Remove("checked");            }        }        AddErrorClass(builder,name);        return builder.ToHTMLString(TagRenderMode.SelfClosing);    }

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