各位好，请哪位大侠帮忙把下面的代码转成C#啊，谢谢

String html = template.getOuterHtml();
Matcher m = Constant.PatternField.matcher(html);
int lastEndIndex;
for(lastEndIndex = 0; m.find(lastEndIndex); lastEndIndex = m.end())
{
a1.add(html.substring(lastEndIndex, m.start()));
a2.add(m.group(1));
}