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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
//
// Activator is an object that contains the Activation (CreateInstance/New)
// methods for late bound support.
//
//
//
//
namespace System
{
using System;
using System.Reflection;
using System.Security;
using CultureInfo = System.Globalization.CultureInfo;
using StackCrawlMark = System.Threading.StackCrawlMark;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
using AssemblyHashAlgorithm = System.Configuration.Assemblies.AssemblyHashAlgorithm;
using System.Runtime.Versioning;
using System.Diagnostics.Contracts;
// Only statics, does not need to be marked with the serializable attribute
public sealed class 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 ((object)type == null)
throw new ArgumentNullException(nameof(type));
Contract.EndContractBlock();
if (type is System.Reflection.Emit.TypeBuilder)
throw new NotSupportedException(SR.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)
{
throw new PlatformNotSupportedException(SR.NotSupported_ActivAttr);
}
RuntimeType rt = type.UnderlyingSystemType as RuntimeType;
if (rt == null)
throw new ArgumentException(SR.Arg_MustBeType, nameof(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);
}
static public Object CreateInstance(Type type, bool nonPublic)
{
return CreateInstance(type, nonPublic, wrapExceptions: true);
}
static internal Object CreateInstance(Type type, bool nonPublic, bool wrapExceptions)
{
if ((object)type == null)
throw new ArgumentNullException(nameof(type));
Contract.EndContractBlock();
RuntimeType rt = type.UnderlyingSystemType as RuntimeType;
if (rt == null)
throw new ArgumentException(SR.Arg_MustBeType, nameof(type));
return rt.CreateInstanceDefaultCtor(!nonPublic, false, true, wrapExceptions);
}
static public T CreateInstance<T>()
{
RuntimeType rt = typeof(T) as RuntimeType;
// This is a workaround to maintain compatibility with V2. Without this we would throw a NotSupportedException for void[].
// Array, Ref, and Pointer types don't have default constructors.
if (rt.HasElementType)
throw new MissingMethodException(SR.Arg_NoDefCTor);
// Skip the CreateInstanceCheckThis call to avoid perf cost and to maintain compatibility with V2 (throwing the same exceptions).
return (T)rt.CreateInstanceDefaultCtor(true /*publicOnly*/, true /*skipCheckThis*/, true /*fillCache*/, true /*wrapExceptions*/);
}
}
}
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