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POprotobuf-net class with dictionary property
 

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    <p>Given the following classes,</p> <pre><code>public static void Test() { var bigDictionary = new Dictionary&lt;string, TestClass&gt;(); bigDictionary.Add("entry1", new TestClass()); bigDictionary.Add("entry2", new TestClass()); bigDictionary.Add("entry3", new TestClass()); // EDIT: Added these lines bigDictionary["entry1"].MyDictionary.Add(1, new SecondTestClass() { MyVar = "hello" }); bigDictionary["entry1"].MyDictionary.Add(2, new SecondTestClass() { MyVar = "world" }); bigDictionary["entry2"].MyDictionary.Add(1, new SecondTestClass() { MyVar = "please" }); bigDictionary["entry2"].MyDictionary.Add(2, new SecondTestClass() { MyVar = "work" }); using (var file = System.IO.File.Create("test.temp")) { ProtoBuf.Serializer.Serialize(file, bigDictionary); } Dictionary&lt;string, TestClass&gt; outDict = null; using (var file = System.IO.File.OpenRead("test.temp")) { outDict = ProtoBuf.Serializer.Deserialize&lt;Dictionary&lt;string, TestClass&gt;&gt;(file); } // EDIT: You'll notice these asserts fail System.Diagnostics.Debug.Assert(outDict["entry1"].MyDictionary.ContainsKey(1)); System.Diagnostics.Debug.Assert(outDict["entry1"].MyDictionary.ContainsKey(2)); System.Diagnostics.Debug.Assert(outDict["entry2"].MyDictionary.ContainsKey(1)); System.Diagnostics.Debug.Assert(outDict["entry2"].MyDictionary.ContainsKey(2)); } [System.Runtime.Serialization.DataContract] public class TestClass { public TestClass() { MyDictionary = new Dictionary&lt;int,SecondTestClass&gt;(); } [System.Runtime.Serialization.DataMember] public Dictionary&lt;int, SecondTestClass&gt; MyDictionary { get; set; } } [System.Runtime.Serialization.DataContract] public class SecondTestClass { [System.Runtime.Serialization.DataMember] public string MyVar { get; set; } } </code></pre> <p>(How) can I get <code>bigDictionary</code> to serialize without throwing the following exception?</p> <pre><code>"Only data-contract classes (and lists/arrays of such) can be processed (error processing Dictionary`2)" </code></pre> <p>(I have tried tagging with DataContract/DataMember ProtoContract/ProtoMember etc. but nothing seems to work)</p> <p>Thanks in advance for any help.</p> <p>EDIT: Seems I have kinda worked it out. Given the above edited code, you'll notice the asserts fail. So it would seem that the inner dictionary is not being serialized at all. However, if I change the DataContract tags to Protobuf.ProtoContract (and DataMember to ProtoMember), it correctly picks up the inner dictionary. </p> <p>Am I mis-using the library or is this a bug?</p>
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    1. COI will try to look at this later today, but from memory that should (more or less) work fine...
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      1. USMarc Gravell
    2. COSee my edit for additional information.
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    3. COFurther investigation shows that because one of my classes had an object variable, this was causing the serialization to fail. The exception message was just misleading.
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