This question was closed Aug 26, 2016 at 06:31 PM by TickTakashi for the following reason:

The question is answered, right answer was accepted

Question by TickTakashi · Aug 25, 2016 at 08:54 PM · serialization string binaryformatter deserialization

Using BinaryFormatter for deserialization - ArgumentException: method argument length mismatch

So i'm trying to serialize and deserialize a few basic classes, I get this very cryptic error:

 ArgumentException: method argument length mismatch
 System.Delegate.CreateDelegate (System.Type type, System.Object firstArgument, System.Reflection.MethodInfo method, Boolean throwOnBindFailure)

And I really have absolutely no idea why. My code contains no delegates, no reflection, nothing but basic data structures.

Any tips?

Here's the error in full.

 ArgumentException: method argument length mismatch
 System.Delegate.CreateDelegate (System.Type type, System.Object firstArgument, System.Reflection.MethodInfo method, Boolean throwOnBindFailure) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/Delegate.cs:226)
 System.Delegate.CreateDelegate (System.Type type, System.Object firstArgument, System.Reflection.MethodInfo method) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/Delegate.cs:276)
 System.Runtime.Serialization.SerializationCallbacks.Invoke (System.Collections.ArrayList list, System.Object target, StreamingContext context) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.Serialization/SerializationCallbacks.cs:110)
 System.Runtime.Serialization.SerializationCallbacks.RaiseOnDeserialized (System.Object target, StreamingContext contex) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.Serialization/SerializationCallbacks.cs:136)
 System.Runtime.Serialization.ObjectManager.RaiseOnDeserializedEvent (System.Object obj) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.Serialization/ObjectManager.cs:186)
 System.Runtime.Serialization.ObjectManager.RaiseDeserializationEvent () (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.Serialization/ObjectManager.cs:162)
 System.Runtime.Serialization.Formatters.Binary.ObjectReader.ReadNextObject (System.IO.BinaryReader reader) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.Serialization.Formatters.Binary/ObjectReader.cs:147)
 System.Runtime.Serialization.Formatters.Binary.ObjectReader.ReadObjectGraph (BinaryElement elem, System.IO.BinaryReader reader, Boolean readHeaders, System.Object& result, System.Runtime.Remoting.Messaging.Header[]& headers) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.Serialization.Formatters.Binary/ObjectReader.cs:110)
 System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.NoCheckDeserialize (System.IO.Stream serializationStream, System.Runtime.Remoting.Messaging.HeaderHandler handler) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.Serialization.Formatters.Binary/BinaryFormatter.cs:179)
 System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize (System.IO.Stream serializationStream) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.Serialization.Formatters.Binary/BinaryFormatter.cs:136)
 DataLoader.DeserializeObject (System.String str) (at Assets/Code/Title/DataLoader.cs:237)
 DataLoader+<LoadGameBinary>c__Iterator0.MoveNext () (at Assets/Code/Title/DataLoader.cs:43)
 UnityEngine.SetupCoroutine.InvokeMoveNext (IEnumerator enumerator, IntPtr returnValueAddress) (at C:/buildslave/unity/build/Runtime/Export/Coroutines.cs:17)

Add comment · Show 3

juicyz · Aug 25, 2016 at 10:58 PM 1

Can you post your code so we can have a look at that?

Bunny83 · Aug 25, 2016 at 11:20 PM 1

As you can see from the stacktrace the error is thrown inside the "Deserialize" method of the BinaryFormatter. So you most likely have something setup the wrong way. How do your classes look like?

You might have a class that you deserialize that has a method with one of these attributes:

OnSerializingAttribute
OnSerializedAttribute
OnDeserializingAttribute
OnDeserializedAttribute

However that method most likely has the wrong signature. It should have just a Strea$$anonymous$$gContext parameter. The BinaryFormatter will construct a multicast delegate out of all methods that have such an attribute. Since the error comes from "RaiseOnDeserialized" you most likely have the attribute "OnDeserialized" on a wrong method.