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    <p>(disclosure: I'm the author of protobuf-net)</p> <p><code>BinaryFormatter</code> is a metadata-based serializer; i.e. it sends .NET type information about every object serialized. protobuf-net is a contract-based serializer (the binary equivalent of <code>XmlSerializer</code> / <code>DataContractSerializer</code>, which will also reject this).</p> <p>There is no current mechanism for transporting <em>arbitrary</em> objects, since the other end will have <em>no way</em> of knowing what you are sending; however, if you have a <em>known set</em> of <em>different</em> object types you want to send, there may be options. There is also work in the pipeline to allow runtime-extensible schemas (rather than just attributes, which are fixed at build) - but this is far from complete.</p> <hr> <p>This isn't ideal, but it works... it should be easier when I've completed the work to support runtime schemas:</p> <pre><code>using System; using System.Collections.Generic; using ProtoBuf; [ProtoContract] [ProtoInclude(10, typeof(DataItem&lt;int&gt;))] [ProtoInclude(11, typeof(DataItem&lt;string&gt;))] [ProtoInclude(12, typeof(DataItem&lt;DateTime&gt;))] [ProtoInclude(13, typeof(DataItem&lt;Foo&gt;))] abstract class DataItem { public static DataItem&lt;T&gt; Create&lt;T&gt;(T value) { return new DataItem&lt;T&gt;(value); } public object Value { get { return ValueImpl; } set { ValueImpl = value; } } protected abstract object ValueImpl {get;set;} protected DataItem() { } } [ProtoContract] sealed class DataItem&lt;T&gt; : DataItem { public DataItem() { } public DataItem(T value) { Value = value; } [ProtoMember(1)] public new T Value { get; set; } protected override object ValueImpl { get { return Value; } set { Value = (T)value; } } } [ProtoContract] public class Foo { [ProtoMember(1)] public string Bar { get; set; } public override string ToString() { return "Foo with Bar=" + Bar; } } static class Program { static void Main() { var items = new List&lt;DataItem&gt;(); items.Add(DataItem.Create(12345)); items.Add(DataItem.Create(DateTime.Today)); items.Add(DataItem.Create("abcde")); items.Add(DataItem.Create(new Foo { Bar = "Marc" })); items.Add(DataItem.Create(67890)); // serialize and deserialize var clone = Serializer.DeepClone(items); foreach (DataItem item in clone) { Console.WriteLine(item.Value); } } } </code></pre>
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    1. COThanks Gravell, actualy I realy like your work and hoped for an answer directly from you. I know which datatypes are in the list so I'm really curious about your solution.
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    2. COThanks Gravell, can you give an estimate when you'll have finished the support of runtime schemas?
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    3. COI'd rather not; I gave an estimate before, and it didn't fit... there are a lot of edge-cases to fit, even *before* I optimise it. If I had to guess, I reckon that unless I get a good block of free time (which I don't expect) it'll take another couple of months. I'm also trying to keep the "trunk" up to date with the latest wire-format changes, which makes things even more fun.
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