Question

如何使用razor helper方法？

以下链接的答案使用扩展方法。 Action Image MVC3 Razor

Answer 1

我不确定为什么扩展方法不合适，但这样的事情应该有效：

@helper ActionImage(string action, object routeValues, string imagePath, string alt) {
    <a href="@Url.Action(action, routeValues)">
        <img src="@Url.Content(imagePath)" alt="@alt">
    </a>
}

这只是我的头顶，所以你的milage可能会有所不同。您还应该能够将问题中提供的实现用作@functions { }块而不是扩展方法。

Answer 2

以下是我的图片html帮助

的简单示例

关于Html助手以及如何整合它的小文章

http://www.sexyselect.net/blog/post/2011/08/16/Writing-a-Razor-MVC3-HTML-Helpers

html助手中的另一个例子 http://www.aspnetwiki.com/page:creating-custom-html-helpers

示例代码

  /// <summary>
        /// Insights the traffic light image.
        /// </summary>
        /// <param name="html">The HTML.</param>
        /// <param name="trafficLight">The traffic light.</param>
        /// <returns>Image for the current traffic light. If not recognised writes name ot he light.</returns>
        public static MvcHtmlString InsightTrafficLightImage(this HtmlHelper html, TrafficLight trafficLight)
        {
            StringBuilder result = new StringBuilder();
            string color = string.Empty;
            string hoverText = string.Empty;
            switch (trafficLight)
            {
                case TrafficLight.Amber:
                    {
                        color = "Yellow";
                        hoverText = "Work in progress";
                        break;
                    }
                case TrafficLight.Green:
                    {
                        color = "green";
                        hoverText = "Complete";
                        break;
                    }

                case TrafficLight.Red:
                    {
                        color = "red";
                        hoverText = "Not yet started";
                        break;
                    }
                case TrafficLight.Black:
                case TrafficLight.Unknown:
                default:
                    {
                        break;
                    }
            }

            if (!string.IsNullOrEmpty(color))
            {
                TagBuilder img = new TagBuilder("img");
                img.MergeAttribute("src", string.Format("/Content/images/traffic_light_{0}.gif", color));
                img.MergeAttribute("alt", hoverText);
                img.MergeAttribute("title", hoverText);
                result.Append(img.ToString());
            }
            else
            {
                result.Append(Enum.GetName(typeof(TrafficLight), trafficLight));
            }
            return MvcHtmlString.Create(result.ToString());
        }

希望你发现它有用

使用Helper方法在MVC3 Razor上的动作图像链接

2 个答案: