Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Activator.cs / 1 / Activator.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// // // Activator is an object that contains the Activation (CreateInstance/New) // methods for late bound support. // // // // namespace System { using System; using System.Reflection; using System.Runtime.Remoting; using System.Runtime.Remoting.Activation; using Message = System.Runtime.Remoting.Messaging.Message; using CultureInfo = System.Globalization.CultureInfo; using Evidence = System.Security.Policy.Evidence; using StackCrawlMark = System.Threading.StackCrawlMark; using System.Runtime.InteropServices; using System.Security.Permissions; using AssemblyHashAlgorithm = System.Configuration.Assemblies.AssemblyHashAlgorithm; // Only statics, does not need to be marked with the serializable attribute [ClassInterface(ClassInterfaceType.None)] [ComDefaultInterface(typeof(_Activator))] [System.Runtime.InteropServices.ComVisible(true)] public sealed class Activator : _Activator { internal const int LookupMask = 0x000000FF; internal const BindingFlags ConLookup = (BindingFlags) (BindingFlags.Instance | BindingFlags.Public); internal const BindingFlags ConstructorDefault= BindingFlags.Instance | BindingFlags.Public | BindingFlags.CreateInstance; // This class only contains statics, so hide the worthless constructor private Activator() { } // CreateInstance // The following methods will create a new instance of an Object // Full Binding Support // For all of these methods we need to get the underlying RuntimeType and // call the Impl version. static public Object CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture) { return CreateInstance(type, bindingAttr, binder, args, culture, null); } static public Object CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) { if (type == null) throw new ArgumentNullException("type"); if (type is System.Reflection.Emit.TypeBuilder) throw new NotSupportedException(Environment.GetResourceString( "NotSupported_CreateInstanceWithTypeBuilder" )); // If they didn't specify a lookup, then we will provide the default lookup. if ((bindingAttr & (BindingFlags) LookupMask) == 0) bindingAttr |= Activator.ConstructorDefault; if (activationAttributes != null && activationAttributes.Length > 0){ // If type does not derive from MBR // throw notsupportedexception if(type.IsMarshalByRef){ // The fix below is preventative. // if(!(type.IsContextful)){ if(activationAttributes.Length > 1 || !(activationAttributes[0] is UrlAttribute)) throw new NotSupportedException(Environment.GetResourceString("NotSupported_NonUrlAttrOnMBR")); } } else throw new NotSupportedException(Environment.GetResourceString("NotSupported_ActivAttrOnNonMBR" )); } RuntimeType rt = type.UnderlyingSystemType as RuntimeType; if (rt == null) throw new ArgumentException(Environment.GetResourceString("Arg_MustBeType"),"type"); return rt.CreateInstanceImpl(bindingAttr,binder,args,culture,activationAttributes); } static public Object CreateInstance(Type type, params Object[] args) { return CreateInstance(type, Activator.ConstructorDefault, null, args, null, null); } static public Object CreateInstance(Type type, Object[] args, Object[] activationAttributes) { return CreateInstance(type, Activator.ConstructorDefault, null, args, null, activationAttributes); } static public Object CreateInstance(Type type) { return Activator.CreateInstance(type, false); } /* * Create an instance using the name of type and the assembly where it exists. This allows * types to be created remotely without having to load the type locally. */ static public ObjectHandle CreateInstance(String assemblyName, String typeName) { StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller; return CreateInstance(assemblyName, typeName, false, Activator.ConstructorDefault, null, null, null, null, null, ref stackMark); } static public ObjectHandle CreateInstance(String assemblyName, String typeName, Object[] activationAttributes) { StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller; return CreateInstance(assemblyName, typeName, false, Activator.ConstructorDefault, null, null, null, activationAttributes, null, ref stackMark); } static public Object CreateInstance(Type type, bool nonPublic) { if (type == null) throw new ArgumentNullException("type"); RuntimeType rt = type.UnderlyingSystemType as RuntimeType; if (rt == null) throw new ArgumentException(Environment.GetResourceString("Arg_MustBeType"),"type"); return rt.CreateInstanceImpl(!nonPublic); } static internal Object InternalCreateInstanceWithNoMemberAccessCheck(Type type, bool nonPublic) { if (type == null) throw new ArgumentNullException("type"); RuntimeType rt = type.UnderlyingSystemType as RuntimeType; if (rt == null) throw new ArgumentException(Environment.GetResourceString("Arg_MustBeType"),"type"); return rt.CreateInstanceImpl(!nonPublic, false, false); } static public T CreateInstance() { bool bNeedSecurityCheck = true; bool bCanBeCached = false; RuntimeMethodHandle mh = RuntimeMethodHandle.EmptyHandle; return (T)RuntimeTypeHandle.CreateInstance(typeof(T) as RuntimeType, true, true, ref bCanBeCached, ref mh, ref bNeedSecurityCheck); } static public ObjectHandle CreateInstanceFrom(String assemblyFile, String typeName) { return CreateInstanceFrom(assemblyFile, typeName, null); } static public ObjectHandle CreateInstanceFrom(String assemblyFile, String typeName, Object[] activationAttributes) { return CreateInstanceFrom(assemblyFile, typeName, false, Activator.ConstructorDefault, null, null, null, activationAttributes, null); } static public ObjectHandle CreateInstance(String assemblyName, String typeName, bool ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, Evidence securityInfo) { StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller; return CreateInstance(assemblyName, typeName, ignoreCase, bindingAttr, binder, args, culture, activationAttributes, securityInfo, ref stackMark); } static internal ObjectHandle CreateInstance(String assemblyName, String typeName, bool ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, Evidence securityInfo, ref StackCrawlMark stackMark) { Assembly assembly; if(assemblyName == null) assembly = Assembly.nGetExecutingAssembly(ref stackMark); else assembly = Assembly.InternalLoad(assemblyName, securityInfo, ref stackMark, false); Log(assembly != null, "CreateInstance:: ", "Loaded " + assembly.FullName, "Failed to Load: " + assemblyName); if(assembly == null) return null; Type t = assembly.GetType(typeName, true, ignoreCase); Object o = Activator.CreateInstance(t, bindingAttr, binder, args, culture, activationAttributes); Log(o != null, "CreateInstance:: ", "Created Instance of class " + typeName, "Failed to create instance of class " + typeName); if(o == null) return null; else { ObjectHandle Handle = new ObjectHandle(o); return Handle; } } static public ObjectHandle CreateInstanceFrom(String assemblyFile, String typeName, bool ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, Evidence securityInfo) { Assembly assembly = Assembly.LoadFrom(assemblyFile, securityInfo); Type t = assembly.GetType(typeName, true, ignoreCase); Object o = Activator.CreateInstance(t, bindingAttr, binder, args, culture, activationAttributes); Log(o != null, "CreateInstanceFrom:: ", "Created Instance of class " + typeName, "Failed to create instance of class " + typeName); if(o == null) return null; else { ObjectHandle Handle = new ObjectHandle(o); return Handle; } } // // This API is designed to be used when a host needs to execute code in an AppDomain // with restricted security permissions. In that case, we demand in the client domain // and assert in the server domain because the server domain might not be trusted enough // to pass the security checks when activating the type. // [PermissionSetAttribute(SecurityAction.LinkDemand, Unrestricted = true)] public static ObjectHandle CreateInstance (AppDomain domain, string assemblyName, string typeName) { if (domain == null) throw new ArgumentNullException("domain"); return domain.InternalCreateInstanceWithNoSecurity(assemblyName, typeName); } [PermissionSetAttribute(SecurityAction.LinkDemand, Unrestricted = true)] public static ObjectHandle CreateInstance (AppDomain domain, string assemblyName, string typeName, bool ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, Evidence securityAttributes) { if (domain == null) throw new ArgumentNullException("domain"); return domain.InternalCreateInstanceWithNoSecurity(assemblyName, typeName, ignoreCase, bindingAttr, binder, args, culture, activationAttributes, securityAttributes); } // // This API is designed to be used when a host needs to execute code in an AppDomain // with restricted security permissions. In that case, we demand in the client domain // and assert in the server domain because the server domain might not be trusted enough // to pass the security checks when activating the type. // [PermissionSetAttribute(SecurityAction.LinkDemand, Unrestricted = true)] public static ObjectHandle CreateInstanceFrom (AppDomain domain, string assemblyFile, string typeName) { if (domain == null) throw new ArgumentNullException("domain"); return domain.InternalCreateInstanceFromWithNoSecurity(assemblyFile, typeName); } [PermissionSetAttribute(SecurityAction.LinkDemand, Unrestricted = true)] public static ObjectHandle CreateInstanceFrom (AppDomain domain, string assemblyFile, string typeName, bool ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, Evidence securityAttributes) { if (domain == null) throw new ArgumentNullException("domain"); return domain.InternalCreateInstanceFromWithNoSecurity(assemblyFile, typeName, ignoreCase, bindingAttr, binder, args, culture, activationAttributes, securityAttributes); } #if FEATURE_COMINTEROP public static ObjectHandle CreateInstance (ActivationContext activationContext) { AppDomainManager domainManager = AppDomain.CurrentDomain.DomainManager; if (domainManager == null) domainManager = new AppDomainManager(); return domainManager.ApplicationActivator.CreateInstance(activationContext); } public static ObjectHandle CreateInstance (ActivationContext activationContext, string[] activationCustomData) { AppDomainManager domainManager = AppDomain.CurrentDomain.DomainManager; if (domainManager == null) domainManager = new AppDomainManager(); return domainManager.ApplicationActivator.CreateInstance(activationContext, activationCustomData); } public static ObjectHandle CreateComInstanceFrom(String assemblyName, String typeName) { return CreateComInstanceFrom(assemblyName, typeName, null, AssemblyHashAlgorithm.None); } public static ObjectHandle CreateComInstanceFrom(String assemblyName, String typeName, byte[] hashValue, AssemblyHashAlgorithm hashAlgorithm) { // jit does not check for that, so we should do it ... Assembly assembly = Assembly.LoadFrom(assemblyName, null, hashValue, hashAlgorithm); Type t = assembly.GetType(typeName, true, false); Object[] Attr = t.GetCustomAttributes(typeof(ComVisibleAttribute),false); if (Attr.Length > 0) { if (((ComVisibleAttribute)Attr[0]).Value == false) throw new TypeLoadException(Environment.GetResourceString( "Argument_TypeMustBeVisibleFromCom" )); } Log(assembly != null, "CreateInstance:: ", "Loaded " + assembly.FullName, "Failed to Load: " + assemblyName); if(assembly == null) return null; Object o = Activator.CreateInstance(t, Activator.ConstructorDefault, null, null, null, null); Log(o != null, "CreateInstance:: ", "Created Instance of class " + typeName, "Failed to create instance of class " + typeName); if(o == null) return null; else { ObjectHandle Handle = new ObjectHandle(o); return Handle; } } #endif // FEATURE_COMINTEROP // This method is a helper method and delegates to the remoting // services to do the actual work. [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.RemotingConfiguration)] static public Object GetObject(Type type, String url) { return GetObject(type, url, null); } // This method is a helper method and delegates to the remoting // services to do the actual work. [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.RemotingConfiguration)] static public Object GetObject(Type type, String url, Object state) { if (type == null) throw new ArgumentNullException("type"); return RemotingServices.Connect(type, url, state); } [System.Diagnostics.Conditional("_DEBUG")] private static void Log(bool test, string title, string success, string failure) { if(test) Message.DebugOut(title+success+"\n"); else Message.DebugOut(title+failure+"\n"); } void _Activator.GetTypeInfoCount(out uint pcTInfo) { throw new NotImplementedException(); } void _Activator.GetTypeInfo(uint iTInfo, uint lcid, IntPtr ppTInfo) { throw new NotImplementedException(); } void _Activator.GetIDsOfNames([In] ref Guid riid, IntPtr rgszNames, uint cNames, uint lcid, IntPtr rgDispId) { throw new NotImplementedException(); } void _Activator.Invoke(uint dispIdMember, [In] ref Guid riid, uint lcid, short wFlags, IntPtr pDispParams, IntPtr pVarResult, IntPtr pExcepInfo, IntPtr puArgErr) { throw new NotImplementedException(); } } }
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