Question

I have an object and am trying to save it to the State dictionary, but when i pass an object to it using :

State["name"] = object;

i see some exceptions being raised:

A first chance exception of type
‘System.Runtime.Serialization.InvalidDataContractException’ occurred
in System.Runtime.Serialization.dll A first chance exception of type
‘System.Reflection.TargetInvocationException’ occurred in mscorlib.dll
A first chance exception of type
‘System.Runtime.Serialization.InvalidDataContractException’ occurred
in System.Runtime.Serialization.dll

State does automatically serialize and deserialize for objects passed. What could be the problem?

I suspect that the object must use [Serialize] when the class is declared. i try to use [Serialize] on my class but it isn’t recognized although i have using System.Runtime.Serialization; declared and the reference exists

UPDATE

here is the class that i’m trying to serialize :

public class MeshObject
    {
        public ModelMesh mesh; // xna specific class
        public Matrix startOrientation; // xna specific class
        public Matrix Orientation; // xna specific class
        public bool isSetInPlace = false;
        public bool isSelected = false;
        public bool inPlay = false;
    }

UPDATE 2

from what i understand from this post, there is no [Serializable] in Silverlight. How can i resolve this problem?

Answer 1

As you can read here

• The Serializable attribute is not available in WP7 (it is only needed for binary serialization anyway)
• You can use XmlSerializer to Serialize and Deserialize
• You’ll need to reference the “System.Xml.Serialization.dll” too.

If you want to serialize a type that is not serializable you will need to implement the serialization yourself: http://mobile.dzone.com/articles/windows-phone-7-serialization