为选定值MVC 5设置viewbag [英] Set viewbag for selected value MVC 5

问题描述

I am trying to set Selected option to a ViewBag so that when that item is selected specific code is run. It is running only the first item all the item. 

我的尝试：

What I have tried:

Below is my code. Any help will be appreciated.

if (RecurringSeries.Weekly == weekly)
{
   code  goes here
}
else
if (RecurringSeries.Monthly == monthly)
{
   code  goes here
}
 
 
 if (RecurringSeries.Weekly == weekly)
  {
   ViewBag.weekly = weekly;
   }
  else
  {
  ViewBag.monthly = monthly;
  }			
			
<div class="form-group">
  <label>Recurring Series</label>
 <select id="ddRecurring" class="form-control">
  <option value="@ViewBag.weekly">Weekly</option>
 <option value="@ViewBag.monthly">Monthly</option>
</select>
</div>

推荐答案

我希望这对您有用，因为您试图将所选值保留在ViewBag。

I hope this will work for you as you are trying to keep selected value in a ViewBag.

public class UserVM
{
   public string Year { set; get; }
   public string Month { set; get; }
   public string Day{ set; get; }
}

在一个视图包中设置值并绑定

Set value in a viewbag and bind

[HttpGet]
public ActionResult Register(User user)
{
     // It should be better to read this data from database
     ViewBag.Year = new SelectList(
                                    new List<SelectListItem>
                                    {
                                        new SelectListItem { Text = "1368", Value = "1987" },
                                        new SelectListItem { Text = "1369", Value = "1988"}, //....
                                    }, "Value" , "Text");
    // Also other properties like Month and Day
     return View();
}

@using (Html.BeginForm())
{
    <div class="form-group">
        @Html.DropDownListFor(m => m.Year, (SelectList)ViewBag.Year, "Select one")
    </div>

    <button type="Submit" class="btn btn-success submit">Send</button>
}

获取所选值并将其设置到另一个视图包中。

Get the selected value and set it into another view bag.

[HttpPost]
public ActionResult Register(VM model) 
{
    if(!ModelState.IsValid) 
    {
       ViewBag.SelectedYear = model.Year;
    }
    return View();
}

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