ASP.NET MVC 3 Razor recursive function

Question

Okay, so I want to display a list containing lists of lists of lists...

I have no way of knowing how many levels there are to display, so I figured this is where I b

Answer 1

The Razor view engine allows to write inline recursive helpers with the @helper keyword.

@helper ShowTree(IEnumerable<Foo> foos)
{
    <ul>
        @foreach (var foo in foos)
        {
            <li>
                @foo.Title
                @if (foo.Children.Any())
                {
                    @ShowTree(foo.Children)
                }
            </li>
        }
    </ul>
}

Answer 2

I think it is best to create an HTML helper for this. Something like this:

public static string ShowSubItems(this HtmlHelper helper, MyObject _object)
{
     StringBuilder output = new StringBuilder();
     if(_object.ListOfObjects.Count > 0)
     {
         output.Append("<ul>");

         foreach(MyObject subItem in _object.listOfObjects)
         {
             output.Append("<li>");
             output.Append(_object.Title);
             output.Append(html.ShowSubItems(subItem.listOfObjects);
             output.Append("</li>")
         }
         output.Append("</ul>");
     }
     return output.ToString();
}

Then call it like this:

@foreach(MyObject item in @Model.ListOfObjects){
    <div> @item.Title </div>
    @html.ShowSubItems(item)
}