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POHow to extend the HtmlHelper with the IDictionary<string, object> overload?
 

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  1. POHow to extend the HtmlHelper with the IDictionary<string, object> overload?
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    <p>I created an extension method for the HtmlHelper which works very well. Now I need to create the overload that receives an IDictionary so I can add a css class to it so I tried the following:</p> <pre><code>public static MvcHtmlString EnumDropDownListFor&lt;TModel, TEnum&gt;(this HtmlHelper&lt;TModel&gt; htmlHelper, Expression&lt;Func&lt;TModel, TEnum&gt;&gt; expression) { return EnumDropDownListFor(htmlHelper, expression, null); } public static MvcHtmlString EnumDropDownListFor&lt;TModel, TEnum&gt;(this HtmlHelper&lt;TModel&gt; htmlHelper, Expression&lt;Func&lt;TModel, TEnum&gt;&gt; expression, IDictionary&lt;string, object&gt; htmlAttributes) { var items = DoSomething(); return htmlHelper.DropDownListFor(expression, items, htmlAttributes); } </code></pre> <p>When I tried to use it in my view I still got the following exception:</p> <blockquote> <p>Compilation Error</p> <p>Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. </p> <p>Compiler Error Message: CS1928: 'System.Web.Mvc.HtmlHelper' does not contain a definition for 'EnumDropDownListFor' and the best extension method overload 'LIMM.Web.HtmlHelpers.HtmlDropDownExtensions.EnumDropDownListFor(System.Web.Mvc.HtmlHelper, System.Linq.Expressions.Expression>, System.Collections.Generic.IDictionary)' has some invalid arguments</p> </blockquote> <p>Obviously I'm not extending the method correctly but so google hasn't been my friend in finding a way to accomplish this. A little help will be appreciated.</p> <p>Thanks.</p> <p><strong>UPDATE</strong>: As I type the code in the view, intellisense does give me both overloads. The error happens when I run the application.</p>
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    1. USSergio Romero
    1. USSergio Romero
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    1. CODid you make sure to add a using statement to your view so it knows how to find your extension methods?
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      1. USM.Babcock
    2. COhave you seen this question? http://stackoverflow.com/questions/7371652/custom-helper-in-asp-net-mvc3 I hope it will help.
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      1. USAnarchistGeek
    3. CO@M.Babcock: Of course I did :) Like I said the original method worked fine, it's just the overload who has the issue.
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      1. USSergio Romero
 

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