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    <blockquote> <p>Now both methods get called before the constructor gets called</p> </blockquote> <p>No, the order is:</p> <ul> <li>OnDeserializingMethod</li> <li>.ctor</li> <li>OnDeserializedMethod</li> </ul> <blockquote> <p>And how can a (non-static) method be called before any constructor has been executed? </p> </blockquote> <p>Because it cheats and lies; it doesn't create the object with the constructor; no - really. It uses <code>FormatterServices.GetUninitializedObject</code> to allocate vanilla empty space. And then if there is a custom deserialization constructor it invokes the constructor <em>over the top of that</em> object. Nasty. Like this, basically:</p> <pre><code>var obj = FormatterServices.GetUninitializedObject(typeof(MyClass)); var ctor = obj.GetType().GetConstructor( BindingFlags.Instance | BindingFlags.Public| BindingFlags.NonPublic, null, new[] { typeof(SerializationInfo), typeof(StreamingContext) }, null); ctor.Invoke(obj, new object[2]); </code></pre> <p>IMO they probably should have made this a second method on the <code>ISerializable</code> interface, but for whatever reason: they didn't. A shame really: that would have made it more honest, and avoided people needing to remember to implement the custom constructor.</p> <p>Example output:</p> <pre><code>.ctor: MyClass &gt; serializing OnSerializingMethod: MyClass GetObjectData: MyClass OnSerializedMethod: MyClass &lt; serializing &gt; deserializing OnDeserializingMethod: MyClass .ctor: MyClass OnDeserializedMethod: MyClass &lt; deserializing </code></pre> <p>Example code:</p> <pre><code>using System; using System.IO; using System.Runtime.CompilerServices; using System.Runtime.Serialization; using System.Runtime.Serialization.Formatters.Binary; [Serializable] class MyClass : ISerializable { public MyClass() { Trace(); } protected MyClass(SerializationInfo info, StreamingContext context) { Trace(); } public void GetObjectData(SerializationInfo info, StreamingContext context) { Trace(); } void Trace([CallerMemberName] string caller = null) { System.Console.WriteLine("{0}: {1}", caller, GetType().Name); } [OnDeserializing()] internal void OnDeserializingMethod(StreamingContext context) { Trace(); } [OnDeserialized()] internal void OnDeserializedMethod(StreamingContext context) { Trace(); } [OnSerializing()] internal void OnSerializingMethod(StreamingContext context) { Trace(); } [OnSerialized()] internal void OnSerializedMethod(StreamingContext context) { Trace(); } static void Main() { using (var ms = new MemoryStream()) { var orig = new MyClass(); var ser = new BinaryFormatter(); System.Console.WriteLine("&gt; serializing"); ser.Serialize(ms, orig); System.Console.WriteLine("&lt; serializing"); ms.Position = 0; System.Console.WriteLine("&gt; deserializing"); ser.Deserialize(ms); System.Console.WriteLine("&lt; deserializing"); } } } </code></pre>
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    1. PO.NET Deserialisation with OnDeserializing and OnDeserialized
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    1. USMarc Gravell
    1. USMarc Gravell
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    1. PO.NET Deserialisation with OnDeserializing and OnDeserialized
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    1. COthis code will call the object constuctor var ctor = obj.GetType().GetConstructor(.... I would used InvokeMember to call the method http://www.codeproject.com/Articles/19911/Dynamically-Invoke-A-Method-Given-Strings-with-Met
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      1. USBassam Alugili
    2. COThanks, prefect answer, I will mark it as accepted after I have found out why in my scenario the ctor gets called last. Maybe because the object isn't the root of the serialized tree.
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      1. USGerhard
    3. COOK Marc, your answer is correct only for the root object. See my answer below for a more complex scenario. Any idea why it behaves like that? By the way: very cool [CallerMemberName] Attribute! I didn't know that before (but only .NET 4.5)
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