/
Activator.RuntimeType.cs
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/
Activator.RuntimeType.cs
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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.
using System.Diagnostics.CodeAnalysis;
using System.Reflection;
using System.Globalization;
using System.Runtime.Loader;
using System.Runtime.Remoting;
using System.Threading;
using System.Runtime.CompilerServices;
using System.Security;
namespace System
{
public static partial class Activator
{
//
// Note: CreateInstance returns null for Nullable<T>, e.g. CreateInstance(typeof(int?)) returns null.
//
public static object? CreateInstance([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.NonPublicConstructors | DynamicallyAccessedMemberTypes.PublicConstructors)] Type type, BindingFlags bindingAttr, Binder? binder, object?[]? args, CultureInfo? culture, object?[]? activationAttributes)
{
ArgumentNullException.ThrowIfNull(type);
if (type is Reflection.Emit.TypeBuilder)
throw new NotSupportedException(SR.NotSupported_CreateInstanceWithTypeBuilder);
// If they didn't specify a lookup, then we will provide the default lookup.
const int LookupMask = 0x000000FF;
if ((bindingAttr & (BindingFlags)LookupMask) == 0)
bindingAttr |= ConstructorDefault;
if (activationAttributes?.Length > 0)
throw new PlatformNotSupportedException(SR.NotSupported_ActivAttr);
if (type.UnderlyingSystemType is not RuntimeType rt)
throw new ArgumentException(SR.Arg_MustBeType, nameof(type));
return rt.CreateInstanceImpl(bindingAttr, binder, args, culture);
}
[DynamicSecurityMethod]
[RequiresUnreferencedCode("Type and its constructor could be removed")]
public static ObjectHandle? CreateInstance(string assemblyName, string typeName)
{
StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller;
return CreateInstanceInternal(assemblyName,
typeName,
false,
ConstructorDefault,
null,
null,
null,
null,
ref stackMark);
}
[DynamicSecurityMethod]
[RequiresUnreferencedCode("Type and its constructor could be removed")]
public static ObjectHandle? CreateInstance(string assemblyName, string typeName, bool ignoreCase, BindingFlags bindingAttr, Binder? binder, object?[]? args, CultureInfo? culture, object?[]? activationAttributes)
{
StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller;
return CreateInstanceInternal(assemblyName,
typeName,
ignoreCase,
bindingAttr,
binder,
args,
culture,
activationAttributes,
ref stackMark);
}
[DynamicSecurityMethod]
[RequiresUnreferencedCode("Type and its constructor could be removed")]
public static ObjectHandle? CreateInstance(string assemblyName, string typeName, object?[]? activationAttributes)
{
StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller;
return CreateInstanceInternal(assemblyName,
typeName,
false,
ConstructorDefault,
null,
null,
null,
activationAttributes,
ref stackMark);
}
public static object? CreateInstance([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)] Type type, bool nonPublic) =>
CreateInstance(type, nonPublic, wrapExceptions: true);
internal static object? CreateInstance(Type type, bool nonPublic, bool wrapExceptions)
{
ArgumentNullException.ThrowIfNull(type);
if (type.UnderlyingSystemType is not RuntimeType rt)
throw new ArgumentException(SR.Arg_MustBeType, nameof(type));
return rt.CreateInstanceDefaultCtor(publicOnly: !nonPublic, wrapExceptions: wrapExceptions);
}
[UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026:RequiresUnreferencedCode",
Justification = "Implementation detail of Activator that linker intrinsically recognizes")]
[UnconditionalSuppressMessage("ReflectionAnalysis", "IL2072:UnrecognizedReflectionPattern",
Justification = "Implementation detail of Activator that linker intrinsically recognizes")]
private static ObjectHandle? CreateInstanceInternal(string assemblyString,
string typeName,
bool ignoreCase,
BindingFlags bindingAttr,
Binder? binder,
object?[]? args,
CultureInfo? culture,
object?[]? activationAttributes,
ref StackCrawlMark stackMark)
{
RuntimeAssembly assembly;
if (assemblyString == null)
{
assembly = Assembly.GetExecutingAssembly(ref stackMark);
}
else
{
AssemblyName assemblyName = new AssemblyName(assemblyString);
assembly = RuntimeAssembly.InternalLoad(assemblyName, ref stackMark, AssemblyLoadContext.CurrentContextualReflectionContext);
}
// Issues IL2026 warning.
Type? type = assembly.GetType(typeName, throwOnError: true, ignoreCase);
// Issues IL2072 warning.
object? o = CreateInstance(type!, bindingAttr, binder, args, culture, activationAttributes);
return o != null ? new ObjectHandle(o) : null;
}
[Intrinsic]
public static T CreateInstance<[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicParameterlessConstructor)]T>()
{
return (T)((RuntimeType)typeof(T)).CreateInstanceOfT()!;
}
private static T CreateDefaultInstance<T>() where T : struct => default;
}
}