clambertus opened a new issue #279:
URL: https://github.com/apache/lucenenet/issues/279
<p>The Iterator pattern in Java is equivalent to IEnumerable in .NET.
Classes that were directly ported in Java using the Iterator pattern, cannot be
used with Linq or foreach blocks in .NET.</p>
<p><tt>Next()</tt> would be equivalent to .NET's <tt>MoveNext()</tt>, and in
the below case, <tt>Term()</tt> would be as .NET's <tt>Current</tt> property.
In cases as below, it will require <tt>TermEnum</tt> to become an abstract
class with <tt>Term</tt> and <tt>DocFreq</tt> properties, which would be
returned from another class or method that implemented
<tt>IEnumerable<TermEnum></tt>.</p>
<div class="preformatted panel" style="border-width: 1px;"><div
class="preformattedContent panelContent">
<pre>
public abstract class TermEnum : IDisposable
{
public abstract bool Next();
public abstract Term Term();
public abstract int DocFreq();
public abstract void Close();
public abstract void Dispose();
}
</pre>
</div></div>
<p>would instead look something like:</p>
<div class="preformatted panel" style="border-width: 1px;"><div
class="preformattedContent panelContent">
<pre>
public class TermFreq
{
public abstract Term { get; }
public abstract int { get; }
}
public abstract class TermEnum : IEnumerable<TermFreq>, IDisposable
{
// ...
}
</pre>
</div></div>
<p>Keep in mind that it is important that if the class being converted
implements <tt>IDisposable</tt>, the class that is enumerating the terms (in
this case <tt>TermEnum</tt>) should inherit from both <tt>IEnumerable<T></tt>
<b>and</b> <tt>IDisposable</tt>. This won't be any change to the user, as the
compiler automatically calls <tt>IDisposable</tt> when used in a
<tt>foreach</tt> loop.</p>
<i>JIRA link - <a
href="https://issues.apache.org/jira/browse/LUCENENET-469";>[LUCENENET-469]</a>
created by ccurrens</i>
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