Question

页面加载时，我的日期控件始终为空。这是为什么？数据库中有该控件的数据。

<div class="form-group">
    @Html.LabelFor(model => model.StartDate, new { @class = "control-    label col-md-2" })
    <div class="col-md-10">
        @Html.TextBoxFor(model => model.StartDate, new { type = "Date" })
        @Html.ValidationMessageFor(model => model.StartDate)
    </div>
</div>

<div class="form-group">
    @Html.LabelFor(model => model.EndDate, new { @class = "control-label col-md-2" })
    <div class="col-md-10">
        @Html.TextBoxFor(model => model.EndDate, new { type = "Date" })
        @Html.ValidationMessageFor(model => model.EndDate)
    </div>
</div>

Answer 1

正如@Coulton所述，确保在呈现页面之前，实际上是在控制器上填充模型的StartDate和EndDate属性。此外，如果您在班级上使用[DataType(DataType.Date)]标记，则可以放弃TextBoxFor帮助程序，而是使用EditorFor帮助程序。

在Create或Edit视图之前填充数据属性的示例（这似乎是您尝试在那里构建的视图）：

Controller.cs，ganho.Data是一个带有[DataType(DataType.Date)]标志

的DateTime属性

[HttpGet]
    public ActionResult Edit(int? id)
    {
        // Omitted code
        var result = from ganho in db.Ganhos
                     where ganho.GanhoID == id.Value
                     where ganho.Usuario.Id == user.Id
                     select new GanhoEditViewModel
                     {
                         GanhoID = ganho.GanhoID,
                         Valor = ganho.Valor,
                         Comentario = ganho.Comentario,
                         Data = ganho.Data,
                         Descricao = ganho.Descricao,
                         Tipo = ganho.Tipo
                     };
        if (result.Count() < 1)
        {
            // 404, no such item exists
            return HttpNotFound();
        }
        return View(result.Single());
    }

Edit.chtml

<!-- Hidden Code, not relevant to the question -->
<div class="form-group">
    @Html.LabelFor(model => model.Data, htmlAttributes: new { @class = "control-label col-md-2"})
    <div class="col-md-10">
        @Html.EditorFor(model => model.Data, new { htmlAttributes = new { @class = "form-control", @id = "dataInput"} })
        @Html.ValidationMessageFor(model => model.Data, "", new { @class = "text-danger"})
    </div>
</div>

如果您正在设置创建视图，可以像这样初始化字段：

Controller.cs，ganho.Data是我的DateTime属性，用户将显示占位符数据。

[HttpGet]
public ActionResult Create()
{
    var model = new Ganho()
    {
        // ...
        Data = DateTime.Now,    // Using the current date and time as a placeholder
        // ...
    };
    return View(model);
}

请注意，在所有示例中，我都使用Strongy Typed视图！

为什么页面加载时我的日期控件为空？

1 个答案: