MarshalByRefObject.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / MarshalByRefObject.cs / 1 / MarshalByRefObject.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** File:    MarshalByRefObject.cs 
**
** 
**
** Purpose: Defines the root type for all marshal by reference aka
**          AppDomain bound types
** 
**
** 
===========================================================*/ 
namespace System {
 
    using System;
    using System.Security;
    using System.Security.Permissions;
    using System.Threading; 
    using System.Runtime.Remoting;
    using System.Runtime.Remoting.Lifetime; 
    using System.Runtime.Remoting.Services; 
    using System.Runtime.InteropServices;
    using System.Reflection; 
    using System.Runtime.CompilerServices;
    using CultureInfo = System.Globalization.CultureInfo;

    [Serializable()] 
[System.Runtime.InteropServices.ComVisible(true)]
    public abstract class MarshalByRefObject 
    { 
        private Object __identity;
 
        private Object Identity { get { return __identity; } set { __identity = value; } }
#if FEATURE_COMINTEROP
        internal IntPtr GetComIUnknown(bool fIsBeingMarshalled)
        { 
            IntPtr pUnk;
            if(RemotingServices.IsTransparentProxy(this)) 
            { 
                pUnk = RemotingServices.GetRealProxy(this).GetCOMIUnknown(fIsBeingMarshalled);
            } 
            else
            {
                pUnk = Marshal.GetIUnknownForObject(this);
            } 
            return pUnk;
        } 
 
        [MethodImplAttribute(MethodImplOptions.InternalCall)]
        internal static extern IntPtr GetComIUnknown(MarshalByRefObject o); 
#endif // FEATURE_COMINTEROP

        // (1) for remote COM objects IsInstance of can't be executed on
        // the proxies, so we need this method to be executed on the 
        // actual object.
        // (2) for remote objects that do not have the complete type information 
        // we intercept calls to check the type and execute it on the actual 
        // object
        internal bool IsInstanceOfType(Type T) 
        {
            return T.IsInstanceOfType(this);
        }
 
        // for remote COM Objects the late binding methods can't be
        // executed on proxies, so we need this method to execute on 
        // the real object 
        internal Object InvokeMember(String name,BindingFlags invokeAttr,Binder binder,
                            Object[] args,ParameterModifier[] modifiers,CultureInfo culture,String[] namedParameters) 
        {
            Type t = GetType();

            // Sanity check 
            if(!t.IsCOMObject)
                throw new InvalidOperationException(Environment.GetResourceString("Arg_InvokeMember")); 
 
            // Call into the runtime to invoke on the COM object.
            return t.InvokeMember(name, invokeAttr, binder, this, args, modifiers, culture, namedParameters); 
        }

        // Returns a new cloned MBR instance that is a memberwise copy of this
        // with the identity nulled out, so there are no identity conflicts 
        // when the cloned object is marshalled
        protected MarshalByRefObject MemberwiseClone(bool cloneIdentity) 
        { 
            MarshalByRefObject mbr = (MarshalByRefObject)base.MemberwiseClone();
            // set the identity on the cloned object to null 
            if (!cloneIdentity)
                mbr.Identity = null;
            return mbr;
        } 

        // A helper routine to extract the identity either from the marshalbyrefobject base 
        // class if it is not a proxy, otherwise from the real proxy. 
        // A flag is set to indicate whether the object passed in is a server or a proxy
        internal static Identity GetIdentity(MarshalByRefObject obj, out bool fServer) 
        {
            fServer = true;
            Identity id = null;
 
            if(null != obj)
            { 
                if(!RemotingServices.IsTransparentProxy(obj)) 
                {
                    id = (Identity)obj.Identity; 
                }
                else
                {
                    // Toggle flag to indicate that we have a proxy 
                    fServer = false;
                    id = RemotingServices.GetRealProxy(obj).IdentityObject; 
                } 
            }
 
            return id;
        }

        // Another helper that delegates to the helper above 
        internal static Identity GetIdentity(MarshalByRefObject obj)
        { 
            BCLDebug.Assert(!RemotingServices.IsTransparentProxy(obj), "Use this method for server objects only"); 

            bool fServer; 
            return GetIdentity(obj, out fServer);
        }

        internal ServerIdentity __RaceSetServerIdentity(ServerIdentity id) 
        {
            if (__identity == null) 
            { 
                // For strictly MBR types, the TP field in the identity
                // holds the real server 
                if (!id.IsContextBound)
                {
                    id.RaceSetTransparentProxy(this);
                } 
                Interlocked.CompareExchange(ref __identity, id, null);
            } 
            return (ServerIdentity)__identity; 
        }
 

        internal void __ResetServerIdentity()
        {
            __identity = null; 
        }
 
       // This method is used return a lifetime service object which 
       // is used to control the lifetime policy to the object.
       // For the default Lifetime service this will be an object of typoe ILease. 
       //
        [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)]	
        public Object GetLifetimeService()
        { 
            return LifetimeServices.GetLease(this);
        } 
 
       // This method is used return lifetime service object. This method
       // can be overridden to return a LifetimeService object with properties unique to 
       // this object.
       // For the default Lifetime service this will be an object of type ILease.
       //
        [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)]	 
        public virtual Object InitializeLifetimeService()
        { 
            return LifetimeServices.GetLeaseInitial(this); 
        }
 
 	[SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)]	
        public virtual ObjRef CreateObjRef(Type requestedType)
        {
            if(__identity == null) 
            {
                throw new RemotingException(Environment.GetResourceString( 
                    "Remoting_NoIdentityEntry")); 
            }
            return new ObjRef(this, requestedType); 
        }


        // This is for casting interop ObjRefLite's. 
        // ObjRefLite's have been deprecated. These methods are not exposed
        // through any user APIs and would be removed in the future 
        internal bool CanCastToXmlType(String xmlTypeName, String xmlTypeNamespace) 
        {
            Type castType = SoapServices.GetInteropTypeFromXmlType(xmlTypeName, xmlTypeNamespace); 
            if (castType == null)
            {
                String typeNamespace;
                String assemblyName; 
                if (!SoapServices.DecodeXmlNamespaceForClrTypeNamespace(xmlTypeNamespace,
                        out typeNamespace, out assemblyName)) 
                    return false; 

                String typeName; 
                if ((typeNamespace != null) && (typeNamespace.Length > 0))
                    typeName = typeNamespace + "." + xmlTypeName;
                else
                    typeName = xmlTypeName; 

                try 
                { 
                    Assembly asm = Assembly.Load(assemblyName);
                    castType = asm.GetType(typeName, false, false); 
                }
                catch
                {
                    return false; 
                }
            } 
 
            if (castType != null)
                return castType.IsAssignableFrom(this.GetType()); 

            return false;
        } // CanCastToXmlType
 
        // helper method for calling CanCastToXmlType
        // ObjRefLite's have been deprecated. These methods are not exposed 
        // through any user APIs and would be removed in the future 
        internal static bool CanCastToXmlTypeHelper(Type castType, MarshalByRefObject o)
        { 
            if (castType == null)
                throw new ArgumentNullException("castType");

            // MarshalByRefObject's can only be casted to MarshalByRefObject's or interfaces. 
            if (!castType.IsInterface && !castType.IsMarshalByRef)
                return false; 
 
            // figure out xml type name
            String xmlTypeName = null; 
            String xmlTypeNamespace = null;
            if (!SoapServices.GetXmlTypeForInteropType(castType, out xmlTypeName, out xmlTypeNamespace))
            {
                // There's no registered interop type name, so just use the default. 
                xmlTypeName = castType.Name;
                xmlTypeNamespace = 
                    SoapServices.CodeXmlNamespaceForClrTypeNamespace( 
                        castType.Namespace, castType.Module.Assembly.nGetSimpleName());
            } 

            return o.CanCastToXmlType(xmlTypeName, xmlTypeNamespace);
        } // CanCastToXmlType
 
    }
} // namespace
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