///<summary>
/// checks, whether <paramref name="target"/> supports the methods of <paramref name="requiredType"/>.
/// Supports testing transparent proxies.
///</summary>
///<param name="target">the target instance or <c>null</c></param>
///<param name="targetName">the name of the target to be used in error messages</param>
///<param name="requiredType">the type to test for</param>
/// <exception cref="ArgumentNullException">
/// if <paramref name="requiredType"/> is <c>null</c>
/// </exception>
/// <exception cref="NotSupportedException">
/// if it is not possible to invoke methods of
/// type <paramref name="requiredType"/> on <paramref name="target"/>
/// </exception>
public static void Understands(object target, string targetName, Type requiredType)
{
ArgumentNotNull(requiredType, "requiredType");
if (target == null)
{
throw new NotSupportedException(string.Format(CultureInfo.InvariantCulture, "Target '{0}' is null.", targetName));
}
Type targetType;
if (RemotingServices.IsTransparentProxy(target))
{
RealProxy rp = RemotingServices.GetRealProxy(target);
IRemotingTypeInfo rti = rp as IRemotingTypeInfo;
if (rti != null)
{
if (rti.CanCastTo(requiredType, target))
{
return;
}
throw new NotSupportedException(string.Format(CultureInfo.InvariantCulture, "Target '{0}' is a transparent proxy that does not support methods of '{1}'.", targetName, requiredType.FullName));
}
targetType = rp.GetProxiedType();
}
else
{
targetType = target.GetType();
}
if (!requiredType.IsAssignableFrom(targetType))
{
throw new NotSupportedException(string.Format(CultureInfo.InvariantCulture, "Target '{0}' of type '{1}' does not support methods of '{2}'.", targetName, targetType, requiredType.FullName));
}
}
// Check whether we can cast the transparent proxy to the given type
public bool CanCastTo(Type castType, Object o)
{
bool fCastOK = false;
// The identity should be non-null
BCLDebug.Assert(null != IdentityObject, "null != IdentityObject");
Message.DebugOut("CheckCast for identity " + IdentityObject.GetType());
if ((castType == s_typeofObject) ||
(castType == s_typeofMarshalByRefObject))
{
return(true);
}
// Get the objref of the proxy
ObjRef oRef = IdentityObject.ObjectRef;
// If the object ref is non-null then check against the type info
// stored in the it
if (null != oRef)
{
Object oTP = GetTransparentProxy();
// Check that there is a matching type in the server object
// hierarchy represented in the objref
Message.DebugOut("Calling CanCastTo for type " + castType);
IRemotingTypeInfo typeInfo = oRef.TypeInfo;
if (null != typeInfo)
{
fCastOK = typeInfo.CanCastTo(castType, oTP);
if (!fCastOK && typeInfo.GetType() == typeof(TypeInfo) && oRef.IsWellKnown())
{
fCastOK = CanCastToWK(castType);
}
}
else
{
if (oRef.IsObjRefLite())
{
// we should do a dynamic cast across the network
fCastOK = MarshalByRefObject.CanCastToXmlTypeHelper(castType, (MarshalByRefObject)o);
}
}
}
// This is a well known object which does not have a backing ObjRef
else
{
fCastOK = CanCastToWK(castType);
}
return(fCastOK);
}
public override IMessage Invoke(IMessage message)
{
RealProxy delegatingProxy = null;
IMethodCallMessage msg = message as IMethodCallMessage;
try
{
delegatingProxy = serviceChannelCreator.CreateChannel();
}
catch (Exception e)
{
if (Fx.IsFatal(e))
{
throw;
}
return(new ReturnMessage(DiagnosticUtility.ExceptionUtility.ThrowHelperError(new COMException(e.GetBaseException().Message, Marshal.GetHRForException(e.GetBaseException()))), msg));
}
MethodBase typeMethod = msg.MethodBase;
IRemotingTypeInfo typeInfo = delegatingProxy as IRemotingTypeInfo;
if (typeInfo == null)
{
throw Fx.AssertAndThrow("Type Info cannot be null");
}
if (typeInfo.CanCastTo(typeMethod.DeclaringType, null))
{
IMessage msgReturned = delegatingProxy.Invoke(message);
ReturnMessage returnMsg = msgReturned as ReturnMessage;
if ((returnMsg == null) || (returnMsg.Exception == null))
{
return(msgReturned);
}
else
{
return(new ReturnMessage(DiagnosticUtility.ExceptionUtility.ThrowHelperError(new COMException(returnMsg.Exception.GetBaseException().Message, Marshal.GetHRForException(returnMsg.Exception.GetBaseException()))), msg));
}
}
else
{
return(new ReturnMessage(DiagnosticUtility.ExceptionUtility.ThrowHelperError(new COMException(SR.GetString(SR.OperationNotFound, typeMethod.Name), HR.DISP_E_UNKNOWNNAME)), msg));
}
}
public bool CanCastTo(Type castType, object o)
{
if (castType == (Type)null)
{
throw new ArgumentNullException("castType");
}
RuntimeType castType1 = castType as RuntimeType;
if (castType1 == (RuntimeType)null)
{
throw new ArgumentException(Environment.GetResourceString("Argument_MustBeRuntimeType"));
}
bool flag = false;
if (castType1 == RemotingProxy.s_typeofObject || castType1 == RemotingProxy.s_typeofMarshalByRefObject)
{
return(true);
}
ObjRef objectRef = this.IdentityObject.ObjectRef;
if (objectRef != null)
{
object transparentProxy = this.GetTransparentProxy();
IRemotingTypeInfo typeInfo = objectRef.TypeInfo;
if (typeInfo != null)
{
flag = typeInfo.CanCastTo((Type)castType1, transparentProxy);
if (!flag && typeInfo.GetType() == typeof(System.Runtime.Remoting.TypeInfo) && objectRef.IsWellKnown())
{
flag = this.CanCastToWK((Type)castType1);
}
}
else if (objectRef.IsObjRefLite())
{
flag = MarshalByRefObject.CanCastToXmlTypeHelper(castType1, (MarshalByRefObject)o);
}
}
else
{
flag = this.CanCastToWK((Type)castType1);
}
return(flag);
}
public static void Main()
{
ChannelServices.RegisterChannel(new HttpChannel(0));
RemotingConfiguration.RegisterActivatedClientType(typeof(SampleService), "http://localhost:9000/MySampleService");
SampleService myRemoteObject = new SampleService();
bool result = myRemoteObject.SampleMethod();
// System.Runtime.Remoting.RemotingServices.GetObjRefForProxy
// <Snippet1>
ObjRef objRefSample = RemotingServices.GetObjRefForProxy(myRemoteObject);
Console.WriteLine("***ObjRef Details***");
Console.WriteLine("URI:\t{0}", objRefSample.URI);
object[] channelData = objRefSample.ChannelInfo.ChannelData;
Console.WriteLine("Channel Info:");
foreach (object o in channelData)
{
Console.WriteLine("\t{0}", o.ToString());
}
IEnvoyInfo envoyInfo = objRefSample.EnvoyInfo;
if (envoyInfo == null)
{
Console.WriteLine("This ObjRef does not have envoy information.");
}
else
{
IMessageSink envoySinks = envoyInfo.EnvoySinks;
Console.WriteLine("Envoy Sink Class: {0}", envoySinks);
}
IRemotingTypeInfo typeInfo = objRefSample.TypeInfo;
Console.WriteLine("Remote type name: {0}", typeInfo.TypeName);
Console.WriteLine("Can my object cast to a Bitmap? {0}",
typeInfo.CanCastTo(typeof(System.Drawing.Bitmap), objRefSample));
// </Snippet1>
}
public bool CanCastTo(Type castType, object o)
{
if (castType == null)
{
throw new ArgumentNullException("castType");
}
RuntimeType fromType = castType as RuntimeType;
if (fromType == null)
{
throw new ArgumentException(Environment.GetResourceString("Argument_MustBeRuntimeType"));
}
bool flag = false;
if ((fromType == s_typeofObject) || (fromType == s_typeofMarshalByRefObject))
{
return(true);
}
ObjRef objectRef = this.IdentityObject.ObjectRef;
if (objectRef != null)
{
object transparentProxy = this.GetTransparentProxy();
IRemotingTypeInfo typeInfo = objectRef.TypeInfo;
if (typeInfo != null)
{
flag = typeInfo.CanCastTo(fromType, transparentProxy);
if ((!flag && (typeInfo.GetType() == typeof(TypeInfo))) && objectRef.IsWellKnown())
{
flag = this.CanCastToWK(fromType);
}
return(flag);
}
if (objectRef.IsObjRefLite())
{
flag = MarshalByRefObject.CanCastToXmlTypeHelper(fromType, (MarshalByRefObject)o);
}
return(flag);
}
return(this.CanCastToWK(fromType));
}
///<summary>
/// checks, whether <paramref name="target"/> supports the methods of <paramref name="requiredType"/>.
/// Supports testing transparent proxies.
///</summary>
///<param name="target">the target instance or <c>null</c></param>
///<param name="targetName">the name of the target to be used in error messages</param>
///<param name="requiredType">the type to test for</param>
/// <exception cref="ArgumentNullException">
/// if <paramref name="requiredType"/> is <c>null</c>
/// </exception>
/// <exception cref="NotSupportedException">
/// if it is not possible to invoke methods of
/// type <paramref name="requiredType"/> on <paramref name="target"/>
/// </exception>
public static void Understands(object target, string targetName, Type requiredType)
{
ArgumentNotNull(requiredType, "requiredType");
if (target == null)
{
ThrowNotSupportedException($"Target '{targetName}' is null.");
}
Type targetType = null;
if (RemotingServices.IsTransparentProxy(target))
{
#if !NETSTANDARD
System.Runtime.Remoting.Proxies.RealProxy rp = RemotingServices.GetRealProxy(target);
IRemotingTypeInfo rti = rp as IRemotingTypeInfo;
if (rti != null)
{
if (rti.CanCastTo(requiredType, target))
{
return;
}
ThrowNotSupportedException(
$"Target '{targetName}' is a transparent proxy that does not support methods of '{requiredType.FullName}'.");
}
targetType = rp.GetProxiedType();
#endif
}
else
{
targetType = target.GetType();
}
if (!requiredType.IsAssignableFrom(targetType))
{
ThrowNotSupportedException($"Target '{targetName}' of type '{targetType}' does not support methods of '{requiredType.FullName}'.");
}
}
public override IMessage Invoke(IMessage message)
{
RealProxy proxy = null;
IMethodCallMessage mcm = message as IMethodCallMessage;
try
{
proxy = this.serviceChannelCreator.CreateChannel();
}
catch (Exception exception)
{
if (Fx.IsFatal(exception))
{
throw;
}
return(new ReturnMessage(DiagnosticUtility.ExceptionUtility.ThrowHelperError(new COMException(exception.GetBaseException().Message, Marshal.GetHRForException(exception.GetBaseException()))), mcm));
}
MethodBase methodBase = mcm.MethodBase;
IRemotingTypeInfo info = proxy as IRemotingTypeInfo;
if (info == null)
{
throw Fx.AssertAndThrow("Type Info cannot be null");
}
if (info.CanCastTo(methodBase.DeclaringType, null))
{
IMessage message3 = proxy.Invoke(message);
ReturnMessage message4 = message3 as ReturnMessage;
if ((message4 != null) && (message4.Exception != null))
{
return(new ReturnMessage(DiagnosticUtility.ExceptionUtility.ThrowHelperError(new COMException(message4.Exception.GetBaseException().Message, Marshal.GetHRForException(message4.Exception.GetBaseException()))), mcm));
}
return(message3);
}
return(new ReturnMessage(DiagnosticUtility.ExceptionUtility.ThrowHelperError(new COMException(System.ServiceModel.SR.GetString("OperationNotFound", new object[] { methodBase.Name }), HR.DISP_E_UNKNOWNNAME)), mcm));
}
// Check whether we can cast the transparent proxy to the given type
public bool CanCastTo(Type castType, Object o)
{
bool fCastOK = false;
// The identity should be non-null
BCLDebug.Assert(null != IdentityObject, "null != IdentityObject");
Message.DebugOut("CheckCast for identity " + IdentityObject.GetType());
if ((castType == s_typeofObject) ||
(castType == s_typeofMarshalByRefObject))
{
return(true);
}
// Get the objref of the proxy
ObjRef oRef = IdentityObject.ObjectRef;
// If the object ref is non-null then check against the type info
// stored in the it
if (null != oRef)
{
Object oTP = GetTransparentProxy();
// Check that there is a matching type in the server object
// hierarchy represented in the objref
Message.DebugOut("Calling CanCastTo for type " + castType);
IRemotingTypeInfo typeInfo = oRef.TypeInfo;
if (null != typeInfo)
{
fCastOK = typeInfo.CanCastTo(castType, oTP);
}
else
{
if (oRef.IsObjRefLite())
{
// we should do a dynamic cast across the network
fCastOK = MarshalByRefObject.CanCastToXmlTypeHelper(castType, (MarshalByRefObject)o);
}
}
}
// This is a well known object which does not have a backing ObjRef
else
{
Message.DebugOut("CheckCast for well known objects and type " + castType);
// Check whether the type to which we want to cast is
// compatible with the current type
if (castType.IsClass)
{
fCastOK = GetProxiedType().IsAssignableFrom(castType);
}
else
{
// NOTE: we are coming here also for x-context proxies
// when unmanaged code cannot determine if the cast is not
// okay
if (!(IdentityObject is ServerIdentity))
{
BCLDebug.Assert(
IdentityObject.URI != null,
"Bad WellKnown ID");
// Always allow interface casts to succeed. If the
// interface is not supported by the well known object
// then we will throw an exception when the interface
// is invoked.
fCastOK = true;
}
}
}
return(fCastOK);
}