CODEWITHSUNDEEP
c#asp.net
Xavier Peña
Xavier Peña

Reputation: 7909

How to build a form in the backend in asp.net core?

I am trying to create a HtmlHelper extension that would build a form in the backend.

Something like this:

public static IHtmlContent HiddenFormFor<TModel, TResult>(
        this IHtmlHelper<TModel> htmlHelper,
        Expression<Func<TModel, TResult>> expression,
        string buttonDescription)
{
    var builder = new HtmlContentBuilder();
    // This is the part that doesn't fit, I just copied how it's done in the view:
    using(htmlHelper.BeginForm("index", "home"))
    {
        builder.AppendHtml(htmlHelper.HiddenFor(expression));
        builder.AppendHtml($"<span type=\"submit\" class=\"label label-primary\">{htmlHelper.Raw(buttonDescription)}</span>");
    }
    return builder;
}

The problem with this is that I don't know how to get the elements built with BeginForm and EndForm and put them into the builder.

Upvotes: 0

Views: 305

Answers (1)

StijnvanGaal
StijnvanGaal

Reputation: 441

As i already suggested in the comments: Just use partial views

But as you still request to know how to use it in the backend. Seems like you should look into how Razor works ;) With Razor you are still calling methods from classes in namespaces. BeginForm is a method from the FormExtensions.

So you could do the following:

...
Using System.Web.Mvc.Html;


public static IHtmlContent HiddenFormFor<TModel, TResult>(
        this IHtmlHelper<TModel> htmlHelper,
        Expression<Func<TModel, TResult>> expression,
        string buttonDescription)
{
    var content = new StringBuilder();
    content.Append(FormExtensions.BeginForm(htmlHelper)); //adding <form> to htmlhelper
    content.append(htmlHelper.HiddenFor(expression)); //Add hidden value
    content.append(FormExtensions.EndForm(htmlHelper)); //adding </form> to htmlHelper

    return MvcHtmlString.Create(content.ToString());

}

EDIT Looking into it a bit more i found what i think should be the solution. Check the code above

Upvotes: 2

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