ASP.NET Mvc InvalidCastException：无法转换类型为“System.Collections.Generic.List`1[System.String]”的 object 错误

Question

I am making a page. I am trying to make a DropDownList on this page. There should be two items in this DropDownList . I am trying to determine these two items through the Controller.

But I am getting an error like this:

My codes:

Index.cshtml :

@model IncomeAndExpensiveWeb.Models.IncomeExpensiveTable
@{
    ViewData["Title"] = "Money";
}

<div class="p-3 mb-2 bg-dark text-white">Add</div>
<form class="form-control" action="IncomeExpensiveTables/AddRecord" method="post">
    <div class="row">
        <div class="col">
            <div class="mb-3">
                <label for="Name" class="form-label">Name:</label>
                @Html.TextBoxFor(m => m.Name, new { @class = "form-control" })
            </div>
        </div>
        <div class="col">
            <div class="mb-3">
                <label for="Surname" class="form-label">Surname:</label>
                @Html.TextBoxFor(m => m.Surname, new { @class = "form-control" })
            </div>
        </div>
        <div class="form-group">
            <label>
                <select class="form-control">
                    @foreach (var item in (IEnumerable<IncomeExpensiveTable>)ViewBag.MoneyStatusList)
                    {
                        <option value="@item.Id">@item.MoneyStatus</option>
                    }
                </select>
            </label>
        </div>  
        <div class="form-group">
            <label>Image:</label>
            <input type="File" name="UploadedImage"/>
        </div>
        <br/>
        <div>
            <button class="btn btn-success">Add</button>
        </div>
    </div>
</form>

Controller:

[HttpGet]
public ActionResult Index()
{
    List<string> MoneyStatusList = new List<string>();
    MoneyStatusList.Add("Income");
    MoneyStatusList.Add("Expensive");
    ViewBag.MoneyStatusList = MoneyStatusList;
    return View("Index");
}

Why could this be? How can I solve it? Thanks for help.

Answer 1

select class="form-control">
                    @foreach (var item in (IEnumerable<IncomeExpensiveTable>)ViewBag.MoneyStatusList)
                    {
                        <option value="@item.Id">@item.MoneyStatus</option>
                    }

"IncomeExpensiveTable" is string on code behind. Thats why you can't cast.

Answer 2

You have to cast it your ViewBag model type which is List() and only use just item there is no any item.Id or item.MoneyStatus.

Like this:

 <select class="form-control">
                @foreach (var item in (List<string>)ViewBag.MoneyStatusList)
                {
                    <option value="@item">@item</option>
                }
  </select>