public static HelperResult Loop <T>(this HtmlHelper html,
IEnumerable <T> items,
Func <ListTemplate <T>, HelperResult> template,
Func <Template <IEnumerable <T> >, HelperResult> wrapper = null,
Func <Template <IEnumerable <T> >, HelperResult> empty = null)
{
return(new System.Web.WebPages.HelperResult((tw) =>
{
using (var enumerator = items.GetEnumerator())
{
if (enumerator.MoveNext())
{
var ctx = new ListTemplate <T> {
First = true
};
Action <TextWriter> renderContents = (tw2) =>
{
while (true)
{
ctx.Data = enumerator.Current;
ctx.Last = !enumerator.MoveNext();
if (ctx.Data is ContentItem)
{
using (html.Content().BeginContentScope(ctx.Data as ContentItem))
{
template(ctx).WriteTo(tw2);
}
}
else
{
template(ctx).WriteTo(tw2);
}
if (ctx.Last)
{
break;
}
ctx.Index++;
}
};
if (wrapper != null)
{
wrapper(new Template <IEnumerable <T> > {
Data = items, ContentRenderer = renderContents
}).WriteTo(tw);
}
else
{
renderContents(tw);
}
}
else if (empty != null)
{
empty(new Template <IEnumerable <T> > {
Data = items
}).WriteTo(tw);
}
}
}));
}
public static HelperResult Loop <T>(this HtmlHelper html,
IEnumerable <T> items,
Func <ListTemplate <T>, HelperResult> template,
Func <Template <IEnumerable <T> >, HelperResult> wrapper = null,
Func <ListTemplate <T>, HelperResult> separator = null,
Func <Template <IEnumerable <T> >, HelperResult> empty = null)
{
return(new HelperResult((tw) =>
{
using (var enumerator = items.GetEnumerator())
{
if (enumerator.MoveNext())
{
Action <TextWriter> renderContents = (tw2) =>
{
var ctx = new ListTemplate <T> {
First = true
};
while (true)
{
ctx.Data = enumerator.Current;
ctx.Last = enumerator.MoveNext() == false;
template(ctx).WriteTo(tw2);
if (ctx.Last)
{
break;
}
else if (separator != null)
{
separator(ctx).WriteTo(tw2);
}
ctx.Index++;
if (ctx.First)
{
ctx.First = false;
}
}
};
if (wrapper != null)
{
wrapper(new Template <IEnumerable <T> > {
Data = items, ContentRenderer = renderContents
}).WriteTo(tw);
}
else
{
renderContents(tw);
}
}
else if (empty != null)
{
empty(new Template <IEnumerable <T> > {
Data = items
}).WriteTo(tw);
}
}
}));
}
