[ACCEPTED]-ASP.NET MVC 3 Razor recursive function-razor
Accepted answer
The Razor view engine allows to write inline 1 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>
}
I think it is best to create an HTML helper 2 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 1 it like this:
@foreach(MyObject item in @Model.ListOfObjects){
<div> @item.Title </div>
@html.ShowSubItems(item)
}
In .Net core Instead of helper tag we have 3 to use @functions. This below code might 2 useful to some people. Here "IssuerData" is 1 my custom object
@{
ShowTreeData(Model.HierarchyList);
}
@functions{
public static void ShowTreeData(IList<IssuerData> issuers)
{
<ul>
@foreach (var i in issuers)
{
<li>
@i.IssuerName
@if (i.Children.Any())
{
ShowTreeData(i.Children);
}
</li>
}
</ul>
}
}
Source:
stackoverflow.com
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