.net - 在asp.net 4.0 mvc中显示viewdata

Question

我想要做的是在数据库上成功执行查询后显示一条成功消息。一切工作正常，除了我的 View 数据在 View 页面上不显示任何内容。不知道为什么。以下是我的代码，请帮助我。

public class SearchItem
{
    [Required(ErrorMessage = "Required Field")]
    public string searchItem { get; set; }
}


    public ActionResult Index()
    {
        try
        {
            ViewData["SuccessMessage"] = "";
            return View();
        }
        catch (Exception ex)
        {
            return View("EmptySearch");
        }
    }

    [HttpPost]
    public ActionResult Index(string searchItem)
    {
        try
        {
             ............
            //database query with searchItem
            ...............

            string suceesstring = "A WAREHOUSE HOLD has been added.";
            ViewData["SuccessMessage"] = suceesstring;
            return View();
        }
        catch (Exception ex)
        {
            return View("EmptySearch");
        }
    }

这是我的查看页面:

@model KeleIntegratedTools.Models.SearchItem

@{
    ViewBag.Title = "Great Plains hold Insert Utility";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

< h2>Great Plains hold Insert Utility</h2>
< p class ="PenColor" >
Please enter order number to place on warehouse hold.

@using (Html.BeginForm("Index", "GreatPlains"))

{

< div>
    < fieldset>
        < legend>Order Information</legend>

        <div class="editor-label">
            @Html.Label("Order Number")

            @Html.TextBox("searchItem")
            @Html.ValidationMessageFor(m => m.searchItem)
            @Html.Label(ViewData["SuccessMessage"].ToString())
        </div>
        <p>
            <input type="submit" value="Search" />
        </p>
    </fieldset>
</div>
}

Answer 1

您使用了错误的方法。 Label的第一个参数method 是模型的属性名称。它生成带有属性 for="parameterValue"的 html 标签，而不是带有该文本的标签。要向用户显示消息，您应该这样做

@ViewData["SuccessMessage"]

此外，请查看 TempData property