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如何避免重復的內聯條件定義Html.EditorFor()的htmlAttributes

[英]How do I avoid repetitive inline conditionals for defining htmlAttributes of Html.EditorFor()

我正在構建一個表單,我必須繼續使用內聯條件來添加一個readonly html屬性:

@Html.LabelFor(model => model.EventDate)
<div class="row">
    <div class="col-xs-3">
        @Html.EditorFor(model => model.EventDate, new
        {
            htmlAttributes = Model.IsEditorReadOnly ?
                (object)new { @class = "form-control input-lg", @type = "date", @readonly = "readonly" } :
                (object)new { @class = "form-control input-lg", @type = "date" }
        })
    </div>
</div>
@Html.ValidationMessageFor(model => model.EventDate)

您不能僅對@readonly屬性的值使用條件,因為即使將其設置為null,它也將以readonly=""呈現給客戶端,這足以讓瀏覽器將該字段設置為只讀。

必須有一個更好的方法來做這個,而不是每個表單元素的內聯條件只是添加一個屬性,對嗎?

感謝Steven Muecke提供的所有幫助(在評論和他的鏈接 答案中給予他所有上述選票)。 這是解決方案

對於具有此屬性的模型:

[Display(Name = "Event Date")]
[DataType(DataType.Date)]
[DisplayFormat(DataFormatString = "{0:MM-dd-yyyy}", ApplyFormatInEditMode = true)]
[Range(typeof(DateTime), "01-01-2010", "12-31-2030")]
public DateTime? EventDate { get; set; }

創建此擴展方法:

public static IHtmlString ReadOnlyEditorFor<TModel, TValue>(this HtmlHelper<TModel> html, Expression<Func<TModel, TValue>> expression, object
htmlAttributes = null, bool isReadOnly = false)
{
    IDictionary<string, object> attributes = HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes);
    if (isReadOnly)
    {
        attributes.Add("readonly", "readonly");
    }

    return html.EditorFor(expression, new { htmlAttributes = attributes });
}

然后在視圖中使用它:

@Html.ReadOnlyEditorFor(model => model.EventDate, 
    new { @class = "form-control input-lg", @type = "date" }, 
    Model.IsEditorReadOnly)

並且所有模型的屬性的元數據將出現在頁面上調用它的第一個實例。 生成的html將如下所示:

<input class="form-control input-lg text-box single-line" data-val="true" data-val-date="The field Event Date must be a date." data-val-range="The field Event Date must be between 1/1/2010 12:00:00 AM and 12/31/2030 12:00:00 AM." data-val-range-max="12/31/2030 00:00:00" data-val-range-min="01/01/2010 00:00:00" id="EventDate" name="EventDate" type="date" value="08-01-2015" />

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