严重禁止转载，好多爬虫软件为了浏览到处抓东西，真缺德

 

具有键“CorpType”的 ViewData 项属于类型“System.Int64”,但它必须属于类型“IEnumerable<SelectListItem>"

 

先吐槽，不是不依赖微软的东西，是我对微软的类库实在有种排斥感，有些东西错了又找不到原因，这个问题就找了5个小时

网上硬是没有解决办法，因为技术总监的缘故就得照着做，无奈~~~~~~

问题如下：

 

public  class CorpModel    {        [Required]        [Display(Name = "公司名称")]        public string CorpName { get; set; }        [Required]        [Display(Name = "公司类型")]        public long CorpType { get; set; } }

 

public ActionResult AddCorporation()        {             var temp = dropDownListService.InitCorpTypeDropDownList11();             ViewData["Types"] = new SelectList(temp, "ID", "Name"); ;             return View(corptype);        }

 

 

     
                  @Html.LabelFor(model => model.CorpType, htmlAttributes: new { @class = "control-label col-md-2" })            
      
                       @Html.DropDownListFor(u => u.CorpType,Model.CorpTypeList , "-- Select Contact --", new { @class = "form-control", required = "true" })                @Html.ValidationMessageFor(model => (SelectList)ViewData["Types"], "", new { @class = "text-danger" })            
      
        
     

 第一次调用的时候是没问题的

[HttpPost]        public ActionResult AddCorporation(CorpModel corp)        {            var currentUser = HttpContext.Session[Constants.USER_KEY] as USP.Models.POCO.User;                   if (ModelState.IsValid)            {                AjaxResult result = sysCorpBll.AddCorporation(corp.CorpName, corp.CorpType, currentUser.SysCorp.ID);                if (result.flag)                {                    return RedirectToAction("Corporation", "Corp");                }            }            var temp = dropDownListService.InitCorpTypeDropDownList11();             ViewData["Types"] = new SelectList(temp, "ID", "Name"); ;            return View("AddCorporation", corp);        }

 第二次就报上面异常了

 

最终的解决方案

再viewmodel中增加

public IEnumerable<SelectListItem> CorpTypeList { get; set; }

 

public  class CorpModel    {        [Required]        [Display(Name = "公司名称")]        public string CorpName { get; set; }        [Required]        [Display(Name = "公司类型")]        public long CorpType { get; set; }        public IEnumerable
     
       CorpTypeList { get; set; }    }
     

 

[HttpGet]        public ActionResult AddCorporation()        {            //var temp = dropDownListService.InitCorpTypeDropDownList11();            //ViewData["Types"] = new SelectList(temp, "ID", "Name"); ;            var temp = dropDownListService.InitCorpTypeDropDownList11();            CorpModel corptype = new CorpModel();            corptype.CorpTypeList = new SelectList(temp, "ID", "Name");            return View(corptype);        }        [HttpPost]        public ActionResult AddCorporation(CorpModel corp)        {            var currentUser = HttpContext.Session[Constants.USER_KEY] as USP.Models.POCO.User;                   if (ModelState.IsValid)            {                AjaxResult result = sysCorpBll.AddCorporation(corp.CorpName, corp.CorpType, currentUser.SysCorp.ID);                if (result.flag)                {                    return RedirectToAction("Corporation", "Corp");                }            }            var temp = dropDownListService.InitCorpTypeDropDownList11();            corp.CorpTypeList= new SelectList(temp, "ID", "Name");            return View("AddCorporation", corp);        }

 

     
                  @Html.LabelFor(model => model.CorpType, htmlAttributes: new { @class = "control-label col-md-2" })            
      
                       @Html.DropDownListFor(u => u.CorpType,Model.CorpTypeList , "-- Select Contact --", new { @class = "form-control", required = "true" })                @Html.ValidationMessageFor(model => model.CorpType, "", new { @class = "text-danger" })            
      
        
     

 这样就可以避免这种问题了。。。

 

 

在前边用了一个Html.DropDownListFor方法渲染控件

结果报异常，用reflector跟了半天，结果调用了MVCForm的IDispose方法，我也是醉了

有一个页面用了同样的方法去调用，没问题，到这里就有了问题，我想了想因为是Dispose了顺便又调用了GC，所以页面要重新加载

所以在调用View的时候就得重新赋值给这里的return View("AddCorporation", corp);是没有DropDownList的数据，以至于报错