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POSerialize prefix tree
 

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    <p>I get a <code>ProtoException</code> ("Possible recursion detected (offset: 4 level(s)): o EOW") when serializing a tree structure like so:</p> <pre><code>var tree = new PrefixTree(); tree.Add("racket".ToCharArray()); tree.Add("rambo".ToCharArray()); using (var stream = File.Open("test.prefix", FileMode.Create)) { Serializer.Serialize(stream, tree); } </code></pre> <p>The tree implementation:</p> <pre><code>[ProtoContract] public class PrefixTree { public PrefixTree() { _nodes = new Dictionary&lt;char, PrefixTree&gt;(); } public PrefixTree(char[] chars, PrefixTree parent) { if (chars == null) throw new ArgumentNullException("chars"); if (parent == null) throw new ArgumentNullException("parent"); if (chars.Length == 0) throw new ArgumentException(); _parent = parent; _nodes = new Dictionary&lt;char, PrefixTree&gt;(); _value = chars[0]; var overflow = chars.SubSet(1); if (!overflow.Any()) _endOfWord = true; else Add(overflow.ToArray()); } [ProtoMember(1)] private readonly char _value; [ProtoMember(2)] private readonly bool _endOfWord; [ProtoMember(3)] private readonly IDictionary&lt;char, PrefixTree&gt; _nodes; [ProtoMember(4, AsReference = true)] private readonly PrefixTree _parent; public void Add(char[] word) { if (word == null) throw new ArgumentNullException("word"); if (word.Length == 0) return; var character = word[0]; PrefixTree node; if (_nodes.TryGetValue(character, out node)) { node.Add(word.SubSet(1)); } else { node = new PrefixTree(word, this); _nodes.Add(character, node); } } public override string ToString() { return _endOfWord ? _value + " EOW" : _value.ToString(); } } public static class ListHelper { public static char[] SubSet(this char[] source, int start) { return source.SubSet(start, source.Length - start); } public static char[] SubSet(this char[] source, int start, int length) { if (start &lt; 0) throw new ArgumentOutOfRangeException(); if (start &gt; source.Length) throw new ArgumentOutOfRangeException(); if (length &lt; 0) throw new ArgumentOutOfRangeException(); var result = new char[length]; Array.Copy(source, start, result, 0, length); return result; } } </code></pre> <p>Am I decorating with the wrong attributes or have I simply designed a non-serializable tree?</p> <p>Edit: tried this to no avail:</p> <pre><code>var typeModel = RuntimeTypeModel.Default; var type = typeModel.Add(typeof(PrefixTree), false); type.AsReferenceDefault = true; type.Add("_value", "_endOfWord", "_nodes", "_parent"); var tree = new PrefixTree(); tree.Add("racket".ToCharArray()); tree.Add("rambo".ToCharArray()); using (var stream = File.Open("test.prefix", FileMode.Create)) { typeModel.Serialize(stream, tree); } </code></pre>
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    1. PO
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    1. USj.w.r
    1. USMarcus
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    1. This table or related slice is empty.
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    1. This table or related slice is empty.
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    2. VO
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      1. VTBountyStart
    3. VO
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      1. VTUpMod
    1. COWhat is your `SubSet` extension method? need to understand that to get a working repro. Also; what is the `Add` method?
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      1. USMarc Gravell
    2. COHowever! The main problem here is that the "dictionary" handler doesn't use reference-types by default. I might be able to look more if I can get a working repro.
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      1. USMarc Gravell
    3. CORe the edit, still have "Error 6 No overload for method 'SubSet' takes 2 arguments" - in the ListHelper.SubSet method
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      1. USMarc Gravell
 

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