Empty lists throw an exception

[deanebarker]

An empty UL or OL in the HTML will throw an uncaught exception.

Code:

var html = "<ul></ul>";  // Note: zero LI child elements in the UL
var converter = new Html2Markdown.Converter();
var md = converter.Convert(html);

Exception:

InvalidOperationException: Sequence contains no elements
at System.Linq.Enumerable.Aggregate[TSource](IEnumerable`1 source, Func`3 func)    
at Html2Markdown.Replacement.HtmlParser.ReplaceList(String html)    
at Html2Markdown.Replacement.HtmlParser.ReplaceLists(String html)    
at Html2Markdown.Replacement.CustomReplacer.Replace(String html)    
at Html2Markdown.Converter.<>c.<Convert>b__5_0(String current, IReplacer element)    
at System.Linq.Enumerable.Aggregate[TSource,TAccumulate](IEnumerable`1 source, TAccumulate seed, Func`3 func)    
at Html2Markdown.Converter.Convert(String html)

I was processing thousands of HTML fragments, and ran into this several dozen times. It's very repeatable.

[stevetemple]

I've just happened to add a test case and fix this in my PR for non-closed li tags #89

[stevetemple]

This should be resolved in the latest version @baynezy

[baynezy]

Thanks @stevetemple. @deanebarker can you please confirm?

[deanebarker]

Confirmed. My code snippet from above completes without error now (and returns an empty string, as expected).

[Chaohuiguo]

An empty UL or li in the HTML will throw an uncaught exception.

Code:
string HtmlContent = "<ul><li></li></ul>"; // Note :UL contains LI child elements string mdContent = new Converter().Convert(HtmlContent);

Exception:
System.InvalidOperationException: Sequence contains no elements at System.Linq.Enumerable.Aggregate[TSource](IEnumerable1 source, Func3 func) at Html2Markdown.Replacement.HtmlParser.ReplaceList(String html) at Html2Markdown.Replacement.HtmlParser.ReplaceLists(String html) at Html2Markdown.Replacement.CustomReplacer.Replace(String html) at Html2Markdown.Converter.<>c.<Convert>b__5_0(String current, IReplacer element) at System.Linq.Enumerable.Aggregate[TSource,TAccumulate](IEnumerable1 source, TAccumulate seed, Func3 func) at Html2Markdown.Converter.Convert(String html) at SyncProductsandRolesListToWorkitem.unit.UnitTest1.htmltomd(String filePath) in E:\a\SourceCode\SyncProductsandRolesListToWorkitem\SyncProductsandRolesListToWorkitem.unit\UnitTest1.cs:line 29

[baynezy]

@Chaohuiguo - can you please raise this as a new issue and I will take a look at it?