Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / DelegateSerializationHolder.cs / 1 / DelegateSerializationHolder.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== using System; using System.Reflection; using System.Runtime.Remoting; using System.Runtime.Remoting.Messaging; using System.Runtime.Serialization; using System.Security.Permissions; using System.Globalization; namespace System { [Serializable()] internal sealed class DelegateSerializationHolder : IObjectReference, ISerializable { #region Static Members internal static DelegateEntry GetDelegateSerializationInfo( SerializationInfo info, Type delegateType, Object target, MethodInfo method, int targetIndex) { // Used for MulticastDelegate if (method == null) throw new ArgumentNullException("method"); if (!method.IsPublic || (method.DeclaringType != null && !method.DeclaringType.IsVisible)) new ReflectionPermission(ReflectionPermissionFlag.MemberAccess).Demand(); Type c = delegateType.BaseType; if (c == null || (c != typeof(Delegate) && c != typeof(MulticastDelegate))) throw new ArgumentException(Environment.GetResourceString("Arg_MustBeDelegate"),"type"); if (method.DeclaringType == null) throw new NotSupportedException(Environment.GetResourceString("NotSupported_GlobalMethodSerialization")); DelegateEntry de = new DelegateEntry(delegateType.FullName, delegateType.Module.Assembly.FullName, target, method.ReflectedType.Module.Assembly.FullName, method.ReflectedType.FullName, method.Name); if (info.MemberCount == 0) { info.SetType(typeof(DelegateSerializationHolder)); info.AddValue("Delegate",de,typeof(DelegateEntry)); } // target can be an object so it needs to be added to the info, or else a fixup is needed // when deserializing, and the fixup will occur too late. If it is added directly to the // info then the rules of deserialization will guarantee that it will be available when // needed if (target != null) { String targetName = "target" + targetIndex; info.AddValue(targetName, de.target); de.target = targetName; } // Due to a number of additions (delegate signature binding relaxation, delegates with open this or closed over the // first parameter and delegates over generic methods) we need to send a deal more information than previously. We can // get this by serializing the target MethodInfo. We still need to send the same information as before though (the // DelegateEntry above) for backwards compatibility. And we want to send the MethodInfo (which is serialized via an // ISerializable holder) as a top-level child of the info for the same reason as the target above -- we wouldn't have an // order of deserialization guarantee otherwise. String methodInfoName = "method" + targetIndex; info.AddValue(methodInfoName, method); return de; } #endregion #region Definitions [Serializable] internal class DelegateEntry { #region Internal Data Members internal String type; internal String assembly; internal Object target; internal String targetTypeAssembly; internal String targetTypeName; internal String methodName; internal DelegateEntry delegateEntry; #endregion #region Constructor internal DelegateEntry( String type, String assembly, Object target, String targetTypeAssembly, String targetTypeName, String methodName) { this.type = type; this.assembly = assembly; this.target = target; this.targetTypeAssembly = targetTypeAssembly; this.targetTypeName = targetTypeName; this.methodName = methodName; } #endregion #region Internal Members internal DelegateEntry Entry { get { return delegateEntry; } set { delegateEntry = value; } } #endregion } #endregion #region Private Data Members private DelegateEntry m_delegateEntry; private MethodInfo[] m_methods; #endregion #region Constructor private DelegateSerializationHolder(SerializationInfo info, StreamingContext context) { if (info == null) throw new ArgumentNullException("info"); bool bNewWire = true; try { m_delegateEntry = (DelegateEntry)info.GetValue("Delegate", typeof(DelegateEntry)); } catch { // Old wire format m_delegateEntry = OldDelegateWireFormat(info, context); bNewWire = false; } if (bNewWire) { // retrieve the targets DelegateEntry deiter = m_delegateEntry; int count = 0; while (deiter != null) { if (deiter.target != null) { string stringTarget = deiter.target as string; //need test to pass older wire format if (stringTarget != null) deiter.target = info.GetValue(stringTarget, typeof(Object)); } count++; deiter = deiter.delegateEntry; } // If the sender is as recent as us they'll have provided MethodInfos for each delegate. Look for these and pack // them into an ordered array if present. MethodInfo[] methods = new MethodInfo[count]; int i; for (i = 0; i < count; i++) { String methodInfoName = "method" + i; methods[i] = (MethodInfo)info.GetValueNoThrow(methodInfoName, typeof(MethodInfo)); if (methods[i] == null) break; } // If we got the info then make the array available for deserialization. if (i == count) m_methods = methods; } } #endregion #region Private Members private void ThrowInsufficientState(string field) { throw new SerializationException( String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Serialization_InsufficientDeserializationState"), field)); } private DelegateEntry OldDelegateWireFormat(SerializationInfo info, StreamingContext context) { if (info == null) throw new ArgumentNullException("info"); String delegateType = info.GetString("DelegateType"); String delegateAssembly = info.GetString("DelegateAssembly"); Object target = info.GetValue("Target", typeof(Object)); String targetTypeAssembly = info.GetString("TargetTypeAssembly"); String targetTypeName = info.GetString("TargetTypeName"); String methodName = info.GetString("MethodName"); return new DelegateEntry(delegateType, delegateAssembly, target, targetTypeAssembly, targetTypeName, methodName); } private Delegate GetDelegate(DelegateEntry de, int index) { Delegate d; try { if (de.methodName == null || de.methodName.Length == 0) ThrowInsufficientState("MethodName"); if (de.assembly == null || de.assembly.Length == 0) ThrowInsufficientState("DelegateAssembly"); if (de.targetTypeName == null || de.targetTypeName.Length == 0) ThrowInsufficientState("TargetTypeName"); Type type = Assembly.Load(de.assembly).GetType(de.type, true, false); Type targetType = Assembly.Load(de.targetTypeAssembly).GetType(de.targetTypeName, true, false); // If we received the new style delegate encoding we already have the target MethodInfo in hand. if (m_methods != null) { Object target = de.target != null ? RemotingServices.CheckCast(de.target, targetType) : null; d = Delegate.InternalCreateDelegate(type, target, m_methods[index]); } else { if (de.target != null) d = Delegate.CreateDelegate(type, RemotingServices.CheckCast(de.target, targetType), de.methodName); else d = Delegate.CreateDelegate(type, targetType, de.methodName); } if ((d.Method != null && !d.Method.IsPublic) || (d.Method.DeclaringType != null && !d.Method.DeclaringType.IsVisible)) new ReflectionPermission(ReflectionPermissionFlag.MemberAccess).Demand(); } catch (Exception e) { if (e is SerializationException) throw e; throw new SerializationException(e.Message, e); } catch { throw new SerializationException(); } return d; } #endregion #region IObjectReference public Object GetRealObject(StreamingContext context) { int count = 0; for (DelegateEntry de = m_delegateEntry; de != null; de = de.Entry) count++; int maxindex = count - 1; if (count == 1) { return GetDelegate(m_delegateEntry, 0); } else { object[] invocationList = new object[count]; for (DelegateEntry de = m_delegateEntry; de != null; de = de.Entry) { // Be careful to match the index we pass to GetDelegate (used to look up extra information for each delegate) to // the order we process the entries: we're actually looking at them in reverse order. --count; invocationList[count] = GetDelegate(de, maxindex - count); } return ((MulticastDelegate)invocationList[0]).NewMulticastDelegate(invocationList, invocationList.Length); } } #endregion #region ISerializable public void GetObjectData(SerializationInfo info, StreamingContext context) { throw new NotSupportedException(Environment.GetResourceString("NotSupported_DelegateSerHolderSerial")); } #endregion } }
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