asp.net-mvc – 在MVC Web应用程序中设置默认值

我首先使用数据库,所以我为元数据添加了一个部分类,如下所示：

[MetadataType(typeof(RadioRoutingMetadata))]
public partial class RadioRouting
{
}

public partial class RadioRoutingMetadata
{
    [DefaultValue("%")]
    public string Slot { get; set; }

    [Required(ErrorMessage = "This field is requied")]
    [DefaultValue(0)]
    public int BlockStart { get; set; }

    [Required(ErrorMessage = "This field is requied")]
    [DefaultValue(499)]
    public int BlockEnd { get; set; }

    [DefaultValue(-1)]
    public int FallBackBaseIdentifier { get; set; }
}

读完后没有看到[DefaultValue(T)]在创建时没有将字段初始化为该值.但是Html帮助器方法不看这个字段吗？

这是我的看法：

<p>
   @Html.LabelFor(model => model.Slot,htmlAttributes: new { @class = "control-label col-md-2" })
   <span class="field">
       @Html.EditorFor(model => model.Slot,new { htmlAttributes = new { @class = "form-control" } })
       @Html.ValidationMessageFor(model => model.Slot,"",new { @class = "text-danger" })
   </span>
</p>

<p>
    @Html.LabelFor(model => model.BlockStart,htmlAttributes: new { @class = "control-label col-md-2" })
    <span class="field">
        @Html.EditorFor(model => model.BlockStart,new { htmlAttributes = new { @class = "form-control" } })
        @Html.ValidationMessageFor(model => model.BlockStart,new { @class = "text-danger" })
    </span>
</p>

<p>
    @Html.LabelFor(model => model.BlockEnd,htmlAttributes: new { @class = "control-label col-md-2" })
    <span class="field">
        @Html.EditorFor(model => model.BlockEnd,new { htmlAttributes = new { @class = "form-control" } })
        @Html.ValidationMessageFor(model => model.BlockEnd,new { @class = "text-danger" })
    </span>
</p>

所以,当我现在提供一个创建表单时,我希望这些默认值在表单中.

我是否必须在控制器中初始化Model对象,设置默认值,然后将其传递给create视图,就像它是编辑视图一样？

如果是这样,我如何创建一个初始化分部类中所有默认值的构造函数？