Question

以下内容允许您指定htmlAttribute以获取添加到＆lt; select＆gt;的其他html属性。项目

public IHtmlString DropDownList(string name, IEnumerable<SelectListItem> selectList, IDictionary<string, object> htmlAttributes);
public IHtmlString DropDownList(string name, IEnumerable<SelectListItem> selectList, object htmlAttributes);

我使用了以下内容，从关于SO和其他问题的问题中得到了很好的效果：

<fieldset name="vehicleIdFieldSet">
    <label for="vehicleSelectControl">Choose Vehicle</label>
    @{
        var htmlAttributes = new { id = "vehicleSelectControl", 
                                style = "font-size:24px;",
                                };

        string string_htmlAttributes = "";
        foreach (PropertyDescriptor property in TypeDescriptor.GetProperties(htmlAttributes))
        {
            string_htmlAttributes += string.Format("{0}=\"{1}\" ", property.Name.Replace('_', '-'), property.GetValue(htmlAttributes));
        }
    }
    @Html.DropDownList("vehicleId", listVehicles, string_htmlAttributes) 
    @Html.ValidationMessage("vehicleId")
</fieldset>

我想在属性中添加Validation.ClassFor("vehicleId")。我似乎无法使其工作，部分原因是当属性值为null时，htmlAttribute无法实例化。另外因为class是保留字，但我想我有一个解决方法。

不起作用：ClassFor返回null

var htmlAttributes = new { id = "vehicleSelectControl", 
                        style = "font-size:24px;",
                        @class = Validation.ClassFor("vehicleId").ToString()

不起作用：仍然为空

string className = Validation.ClassFor("vehicleId").ToString();
var htmlAttributes = new { id = "vehicleSelectControl", 
                        style = "font-size:24px;",
                        @class = className
                        };

不能工作：仍然无效，不应该

string className = (String.IsNullOrEmpty(Validation.ClassFor("vehicleId").ToString())) ? "" : Validation.ClassFor("vehicleId").ToString();

var htmlAttributes = new { id = "vehicleSelectControl", 
                        style = "font-size:24px;",
                        @class = className
                        };

我应该放弃，还是有办法让我的＆lt; select＆gt;通过验证风格？

Html.DropDownList的验证和htmlAttributes参数

0 个答案: