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// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
/*============================================================
**
** Class: ObjectCloneHelper
**
**
** Purpose: Helper methods used by ObjectClone to process ISerializable objects etc
**
**
===========================================================*/
#if FEATURE_REMOTING
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 static class ObjectCloneHelper
{
static readonly 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 readonly StreamingContext s_cloneContext = new StreamingContext(StreamingContextStates.CrossAppDomain);
static readonly ISerializationSurrogate s_RemotingSurrogate = new RemotingSurrogate();
static readonly ISerializationSurrogate s_ObjRefRemotingSurrogate = new ObjRefSurrogate();
[System.Security.SecurityCritical] // auto-generated
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)
{
#if !MONO
// 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;
}
}
#endif
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;
}
[System.Security.SecurityCritical] // auto-generated
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(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;
}
}
}
#endif // FEATURE_REMOTING
|
