ObjectCloneHelper.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Runtime / Serialization / ObjectCloneHelper.cs / 1 / ObjectCloneHelper.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
 ** 
 ** Class: ObjectCloneHelper 
 **
 ** 
 ** Purpose: Helper methods used by ObjectClone to process ISerializable objects etc
 **
 **
 ===========================================================*/ 

 
namespace System.Runtime.Serialization 
{
    using System.Runtime.Remoting; 
    using System.Runtime.Remoting.Proxies;
    using System.Runtime.Remoting.Messaging;
    using System.Runtime.Serialization;
    using System; 
    using System.Collections;
    using System.Reflection; 
    using System.Diagnostics; 
    using System.Globalization;
 
    internal sealed class ObjectCloneHelper
    {

        static IFormatterConverter s_converter = new FormatterConverter(); 
        // Currently object cloner is used only to clone stuff across domains. If its used to clone objects within a domain
        // the Clone context will need to be created too.. 
        static StreamingContext    s_cloneContext = new StreamingContext(StreamingContextStates.CrossAppDomain); 
        static ISerializationSurrogate  s_RemotingSurrogate = new RemotingSurrogate();
        static ISerializationSurrogate  s_ObjRefRemotingSurrogate = new ObjRefSurrogate(); 

        internal static object GetObjectData(object serObj, out string typeName, out string assemName, out string[] fieldNames, out object[] fieldValues)
        {
            Type objectType = null; 
            object retObj = null;
 
            if (RemotingServices.IsTransparentProxy(serObj)) 
                objectType = typeof(MarshalByRefObject);
            else 
                objectType = serObj.GetType();

            SerializationInfo  si  = new SerializationInfo(objectType, s_converter);
            if (serObj is ObjRef) 
            {
                s_ObjRefRemotingSurrogate.GetObjectData(serObj, si, s_cloneContext); 
            } 
            else if (RemotingServices.IsTransparentProxy(serObj) || serObj is MarshalByRefObject)
            { 
                // We can only try to smuggle objref's for actual CLR objects
                //   or for RemotingProxy's.
                if (!RemotingServices.IsTransparentProxy(serObj) ||
                    RemotingServices.GetRealProxy(serObj) is RemotingProxy) 
                {
                    ObjRef objRef = RemotingServices.MarshalInternal((MarshalByRefObject)serObj, null, null); 
                    if (objRef.CanSmuggle()) 
                    {
                        if (RemotingServices.IsTransparentProxy(serObj)) 
                        {
                            RealProxy rp = RemotingServices.GetRealProxy(serObj);
                            objRef.SetServerIdentity(rp._srvIdentity);
                            objRef.SetDomainID(rp._domainID); 
                        }
                        else 
                        { 
                            ServerIdentity srvId = (ServerIdentity)MarshalByRefObject.GetIdentity((MarshalByRefObject)serObj);
                            srvId.SetHandle(); 
                            objRef.SetServerIdentity(srvId.GetHandle());
                            objRef.SetDomainID(AppDomain.CurrentDomain.GetId());
                        }
                        objRef.SetMarshaledObject(); 
                        retObj = objRef;
                    } 
                } 

                if (retObj == null) 
                {
                    // Deal with the non-smugglable remoting objects
                    s_RemotingSurrogate.GetObjectData(serObj, si, s_cloneContext);
                } 

            } 
            else if (serObj is ISerializable) 
            {
                ((ISerializable)serObj).GetObjectData(si, s_cloneContext); 
            }
            else
            {
                // Getting here means a bug in cloner 
                throw new ArgumentException(Environment.GetResourceString("Arg_SerializationException"));
            } 
 
            if (retObj == null)
            { 
                typeName = si.FullTypeName;
                assemName = si.AssemblyName;
                fieldNames = si.MemberNames;
                fieldValues = si.MemberValues; 
            }
            else 
            { 
                typeName = null;
                assemName = null; 
                fieldNames = null;
                fieldValues = null;
            }
 
            return retObj;
        } 
 
        internal static SerializationInfo PrepareConstructorArgs(object serObj, string[] fieldNames, object[] fieldValues, out StreamingContext context)
        { 
            SerializationInfo si = null;
            if (serObj is ISerializable)
            {
                si = new SerializationInfo(serObj.GetType(), s_converter); 

                for (int i =0; i < fieldNames.Length; i++) 
                { 
                    if (fieldNames[i] != null)
                        si.AddValue(fieldNames[i], fieldValues[i]); 
                }
            }
            else
            { 
                // We have a case where the from object was ISerializable and to object is not
                // @ 
 
                Hashtable fields = new Hashtable();
                int incomingFieldIndex = 0; 
                int numIncomingFields = 0;
                for (; incomingFieldIndex < fieldNames.Length; incomingFieldIndex++)
                {
                    if (fieldNames[incomingFieldIndex] != null) 
                    {
                        fields[fieldNames[incomingFieldIndex]] = fieldValues[incomingFieldIndex]; 
                        numIncomingFields++; 
                    }
                } 

                MemberInfo[] mi = FormatterServices.GetSerializableMembers(serObj.GetType());

                for (int index = 0; index < mi.Length; index++) 
                {
                    string fieldName = mi[index].Name; 
                    if (!fields.Contains(fieldName)) 
                    {
                        // If we are missing a field value then it's not necessarily 
                        // the end of the world: check whether the field is marked
                        // [OptionalField].
                        Object [] attrs = mi[index].GetCustomAttributes(typeof(OptionalFieldAttribute), false);
                        if (attrs == null || attrs.Length == 0) 
                            throw new SerializationException(String.Format(CultureInfo.CurrentCulture,
                                                                           Environment.GetResourceString("Serialization_MissingMember"), 
                                                                           mi[index], 
                                                                           serObj.GetType(),
                                                                           typeof(OptionalFieldAttribute).FullName)); 
                        continue;
                    }

                    object value = fields[fieldName]; 

                    FormatterServices.SerializationSetValue(mi[index], serObj, value); 
                } 
            }
 
            context = s_cloneContext;
            return si;
        }
    } 

}

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