How to create extension method on IHtmlHelper <dynamic>
This article shows how to create an extension method in HtmlHelper<dynamic>
, but it doesn't work with MVC6 (I changed the HtmlHelper to IHtmlHelper).
Mistake:
'IHtmlHelper<PagedList<Tag>>' does not contain a definition for 'CustomSelectList' and the best extension method overload 'HtmlHelperExtensions.CustomSelectList<Tag>(IHtmlHelper<dynamic>, string, IEnumerable<Tag>, Func<Tag, string>, Func<Tag, string>)' requires a receiver of type 'IHtmlHelper<dynamic>'
How is this done in MVC6?
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1 answer
The extension method must be on IHtmlHelper
, not on HtmlHelper<dynamic>
.
public static HtmlString CustomSelectList<T>(
this IHtmlHelper html,
string selectId,
IEnumerable<T> list,
Func<T, string> getName,
Func<T, string> getValue)
{
StringBuilder builder = new StringBuilder();
builder.AppendFormat("<select id=\"{0}\">", selectId);
foreach (T item in list)
{
builder.AppendFormat("<option value=\"{0}\">{1}</option>",
getValue(item),
getName(item));
}
builder.Append("</select>");
return new HtmlString(builder.ToString());
}
Using:
@(Html.CustomSelectList<Tag>("myId", Model, t => t.Name, t => t.Id.ToString()))
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