如何解决这个错误在asp.net mvc

Question

在我的Index.cshtml里面，我有一个填充了数据的DropDownList。在选择DropDownList项目时，我使用ajax加载部分视图。这些部分视图是表单，填充后，数据将被插入到数据库中。在插入之后，我想去已填充DropDownList最初Index.cshtml，但它不工作，并给出了错误：

An exception of type 'System.InvalidOperationException' occurred in System.Web.Mvc.dll but was not handled in user code Additional information: There is no ViewData item of type 'IEnumerable' that has the key 'TemplatesCategory'.

这里是我的控制器----

public class templateController : Controller 
    { 
     PulseContext db = new PulseContext(); 
     public ActionResult Index() 
     { 
      ViewBag.TemplatesCategory = new SelectList(db.Templates, "Id", "templateName"); 
      return View(); 
     } 
     [HttpGet] 
     public PartialViewResult Clothing() 
     { 
      return PartialView("_ClothingTemplate"); 
     } 
     [HttpPost] 
     public ActionResult Clothing(templateClothing tc) 
     { 
      db.templateClothings.Add(tc); 
      db.SaveChanges(); 
      return View("Index"); 
     } 

这是我的看法-----

@model Pulse.Models.Templates 

    @{ 
     ViewBag.Title = "Index"; 
    } 
    <div class="container"> 
     <script src="~/Scripts/jquery-2.2.3.min.js"></script> 
     <script src="~/Scripts/bootstrap.min.js"></script> 
     <h2>Select your Template</h2> 
     @Html.DropDownList("TemplatesCategory") 
     <script type="text/javascript"> 
     $(document).ready(function() { 
      $("#TemplatesCategory").change(function() { 
       var choice = this.value; 
       if (choice === "1") { 
        $.ajax({ 
         url: '/template/Footwear', 
         contentType: 'application/html;charset=utf-8', 
         type: 'GET', 
         datatype:'html' 
        }) 
        .success(function(result){ 
        $('#templateContainer').html(result) 
       }) 
       } 
       else if (choice === "2") { 
        $.ajax({ 
         url: '/template/Accessory', 
         contentType: 'application/html;charset=utf-8', 
         type: 'GET', 
         datatype: 'html' 
        }) 
        .success(function (result) { 
         $('#templateContainer').html(result) 
        }) 
       } 
       else if (choice === "3") { 
        $.ajax({ 
         url: '/template/Clothing', 
         contentType: 'application/html;charset=utf-8', 
         type: 'GET', 
         datatype: 'html' 
        }) 
        .success(function (result) { 
         $('#templateContainer').html(result) 
        }) 
       } 
      }); 
     }); 
     </script> 
     <div id="templateContainer"></div> 
    </div> 

这里是我的模型 -

namespace Pulse.Models 
{ 
    using System; 
    using System.Collections.Generic; 

    public partial class Templates 
    { 
     public Templates() 
     { 
      this.templateAccessoriesTbls = new HashSet<templateAccessories>(); 
      this.templateClothingTbls = new HashSet<templateClothing>(); 
      this.templateFootwearTbls = new HashSet<templateFootwear>(); 
     } 

     public int Id { get; set; } 
     public string templateName { get; set; } 

     public virtual ICollection<templateAccessories> templateAccessoriesTbls { get; set; } 
     public virtual ICollection<templateClothing> templateClothingTbls { get; set; } 
     public virtual ICollection<templateFootwear> templateFootwearTbls { get; set; } 
    } 
} 

请帮助我如何解决这个错误，以及如何重定向到带有填充下拉列表的索引页面。

Answer 1

你的情况，这是可以做的渲染前致电Index方法View你想

return RedirectToAction("Index"); 

代替：return View("Index");

所以，你的服装应该像下面

[HttpPost] 
    public ActionResult Clothing(templateClothing tc) 
    { 
     db.templateClothings.Add(tc); 
     db.SaveChanges(); 
     return RedirectToAction("Index"); 
    } 

这将召回Index方法并将您的View要