ASP.NET MVC razor: conditional attribute in HTML

Question

Code below doesn\'t seems clean. Any suggestion to improve the code?

class=\         


        

Answer 1

Approach with TagWrap extension method. Code for your question would look like this:

@using (Html.TagWrap("li", condition ? new { @class = "active" } : null))
{
    var anchorAttrs = new Dictionary<string, object> { { "href", Url.Action("BusinessDetails", "Business") } };
    if(condition)
    {
        anchorAttrs["style"] = "color: white; background-color: #08C; border: 1px solid #08C;";
    }
    using (Html.TagWrap("a", anchorAttrs))
    {
        <text>Business Details</text>
    }
}

TagWrap extension methods

using Microsoft.AspNetCore.Mvc.ViewFeatures;

public static IDisposable TagWrap(this IHtmlHelper htmlHelper, string tagName, object data)
{
    return htmlHelper.TagWrap(tagName, HtmlHelper.AnonymousObjectToHtmlAttributes(data));
}

public static IDisposable TagWrap(this IHtmlHelper htmlHelper, string tagName, IDictionary<string, object> data)
{
    var tag = new TagBuilder(tagName);
    tag.MergeAttributes(data);

    htmlHelper.ViewContext.Writer.Write(tag.RenderStartTag());

    return new DisposableAction(() =>
        htmlHelper.ViewContext.Writer.Write(tag.RenderEndTag()));
}

Helper class used for rendering closing tag on Dispose

public class DisposableAction : IDisposable
{
    private readonly Action DisposeAction;

    public DisposableAction(Action action)
    {
        DisposeAction = action;
    }

    public void Dispose()
    {
        DisposeAction();
    }
}