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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