Question

我开始使用我在网络上找到的这个扩展程序：

public static class NewLabelExtensions
    {
        public static MvcHtmlString LabelFor<TModel, TValue>(this HtmlHelper<TModel> html, Expression<Func<TModel, TValue>> expression, object htmlAttributes)
        {
            return LabelFor(html, expression, new RouteValueDictionary(htmlAttributes));
        }
        public static MvcHtmlString LabelFor<TModel, TValue>(this HtmlHelper<TModel> html, Expression<Func<TModel, TValue>> expression, IDictionary<string, object> htmlAttributes)
        {
            var metadata = ModelMetadata.FromLambdaExpression(expression, html.ViewData);
            var htmlFieldName = ExpressionHelper.GetExpressionText(expression);
            var labelText = metadata.DisplayName ?? metadata.PropertyName ?? htmlFieldName.Split('.').Last();
            if (String.IsNullOrEmpty(labelText))
            {
                return MvcHtmlString.Empty;
            }

            var tag = new TagBuilder("label");
            tag.MergeAttributes(htmlAttributes);
            tag.Attributes.Add("for", html.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(htmlFieldName));
            tag.SetInnerText(labelText);
            return MvcHtmlString.Create(tag.ToString(TagRenderMode.Normal));
        }
    }

我这样用：

@Html.LabelFor(m => m.Login.RememberMe, new { @class = "adm" })

结果如下：

<label class="adm" for="Login_RememberMe">Remember me?</label>

但是我想要这个标签的样式。我真的不明白我正在使用的代码。任何人都可以建议更改上面的代码，使LabelFor方法生成吗？

<label class="adm" id="Login_RememberMe" for="Login_RememberMe">Remember me?</label>

由于

Answer 1

您只需添加以下行：

 tag.Attributes.Add("id", html.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(htmlFieldName));

代码：

   public static MvcHtmlString LabelFor<TModel, TValue>(this HtmlHelper<TModel> html, Expression<Func<TModel, TValue>> expression, IDictionary<string, object> htmlAttributes)
    {
        var metadata = ModelMetadata.FromLambdaExpression(expression, html.ViewData);
        var htmlFieldName = ExpressionHelper.GetExpressionText(expression);
        var labelText = metadata.DisplayName ?? metadata.PropertyName ?? htmlFieldName.Split('.').Last();
        if (String.IsNullOrEmpty(labelText))
        {
            return MvcHtmlString.Empty;
        }

        var tag = new TagBuilder("label");
        tag.MergeAttributes(htmlAttributes);
        tag.Attributes.Add("id", html.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(htmlFieldName));
        tag.Attributes.Add("for", html.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(htmlFieldName));
        tag.SetInnerText(labelText);
        return MvcHtmlString.Create(tag.ToString(TagRenderMode.Normal));
    }

如何在C＃中更改扩展方法

1 个答案: