Using custom Html helpers

Question

Trying to use a html helper I found here on the first answer:

Heres the controller part:

 public static class HtmlHelpers
{
    public static MvcHtmlString DisplayWithBreaksFor<TModel, TValue>(this HtmlHelper<TModel> html, Expression<Func<TModel, TValue>> expression)
    {
        var metadata = ModelMetadata.FromLambdaExpression(expression, html.ViewData);
        var model = html.Encode(metadata.Model).Replace("\r\n", "<br />\r\n");

        if (String.IsNullOrEmpty(model))
            return MvcHtmlString.Empty;

        return MvcHtmlString.Create(model);
    }
}

and in the view I use:

@using HtmlHelpers

and

@Html.DisplayWithBreaksFor(m => m.MultiLineField)

But I am getting an error on both

For the first:

"The type or namespace name 'HtmlHelpers' could not be found (are you missing a using directive or an assembly reference?)"

For the second:

"'System.Web.Mvc.HtmlHelper>' does not contain a definition for 'DisplayWithBreaksFor' and no extension method 'DisplayWithBreaksFor' accepting a first argument of type"

"'System.Web.Mvc.HtmlHelper>' could be found (are you missing a using directive or an assembly reference?)"

HtmlHelpers is a class name, @using expects a namespace. Also, that name clashes with one from the framework. — Henk Holterman
– Henk Holterman, Commented Jan 23, 2019 at 9:33
Have you used the full path here @using HtmlHelpers or just this? — TanvirArjel
– TanvirArjel, Commented Jan 23, 2019 at 10:01

Tomato32 · Accepted Answer · 2019-01-23 10:45:13Z

1

You added the wrong namespace. I think you should not put the method in the controller. Just create a new class. So you can reuse code better. Here is a sample. You can refer. Hope to help, my friend :))

1) I created a new class that have namespace is MvcExam.UtilitiesClass

namespace MvcExam.UtilitiesClass
{
    public static class HtmlHelpers
    {
        public static MvcHtmlString DisplayWithBreaksFor<TModel, TValue>(this HtmlHelper<TModel> html, Expression<Func<TModel, TValue>> expression)
        {
            var metadata = ModelMetadata.FromLambdaExpression(expression, html.ViewData);
            var model = html.Encode(metadata.Model).Replace("\r\n", "<br />\r\n");

            if (String.IsNullOrEmpty(model))
                return MvcHtmlString.Empty;

            return MvcHtmlString.Create(model);
        }
    }
}

2) In a View

@using MvcExam.UtilitiesClass

@Html.DisplayWithBreaksFor(m => m.Name)

answered Jan 23, 2019 at 10:45

Tomato32

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1 Comment

Tomato32 Over a year ago

@Conor8630: Well played, my friend :))

dotnetdev4president · Accepted Answer · 2019-01-23 10:41:55Z

0

You have to use the full namespace:

@using YourProjectName.YourAssemblyName.FolderNameWhereYourClassLives;

answered Jan 23, 2019 at 10:41

dotnetdev4president

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