使用ASP.NET MVC中的下拉列表过滤视图

Question

我正在尝试使用下拉列表作为过滤器来过滤列表视图。

我的控制器：

public async Task<ActionResult> Index(int? TradeExerciseNumber)
{
    var TradeExerciseEntries = new TradeExerciseController().GetAll();
    ViewBag.TradeExerciseEntries = new SelectList(TradeExerciseEntries, "TradeExerciseID", "TradeExerciseNumber");

    if (TradeExerciseNumber != null)
    {
        return View(await db.TradesModels.Where(x => x.TradeExerciseId == TradeExerciseNumber).ToListAsync());
    }

    return View(await db.TradesModels.ToListAsync());
}

我的观点是：

@using (Html.BeginForm())
    {
        <p>
            Find by Exercise Number: @Html.DropDownList("TradeExerciseEntries", -how do I pass value to TradeExerciseNumber in my controller to let it render pls- )
            <input type="submit" value="Search" />
        </p>
    }

现在，如何将下拉列表值传递给控制器​​中的TradeExerciseNumber以便让它渲染？非常感谢你。

最好的祝福

Answer 1

所以这就是我在我看来所做的事情，它起作用了：

@using (Html.BeginForm("Index", "Trades")){   
<p>
    Find by Exercise Number: @Html.DropDownList("TradeExerciseNumber", ViewBag.TradeExerciseEntries as SelectList, null, new { onchange = "submit();" })
</p>
}

我希望它有所帮助。谢谢