Activator.CreateInstance Method (Type)
Assembly: mscorlib (in mscorlib.dll)
The type of object to create.
Return ValueA reference to the newly created object.
type is a null reference (Nothing in Visual Basic).
type is not a RuntimeType.
type is an open generic type (that is, the ContainsGenericParameters property returns true).
type cannot be a TypeBuilder.
The constructor being called throws an exception.
The caller does not have permission to call this constructor.
Cannot create an instance of an abstract class, or this member was invoked with a late-binding mechanism.
No matching public constructor was found.
type is a COM object but the class identifier used to obtain the type is invalid, or the identified class is not registered.
type is not a valid type.
The constructor to be invoked must be accessible.
Starting with the , this method can be used to access nonpublic types if the caller has been granted ReflectionPermission with the ReflectionPermissionFlag.ReflectionEmit flag and if the grant set of the assembly that contains the nonpublic types is restricted to the caller’s grant set, or to a subset thereof. (See Security Considerations for Reflection.)
To use this functionality, your application should target the . For more information, see The .NET Framework 3.5 Architecture.
The following code example demonstrates how to call the CreateInstance(Type) method. This code example is part of a larger example provided for the Activator class.
' Create an instance of the StringBuilder type using Activator.CreateInstance. Dim o As Object = Activator.CreateInstance(GetType(StringBuilder)) ' Append a string into the StringBuilder object and display the StringBuilder. Dim sb As StringBuilder = CType(o, StringBuilder) sb.Append("Hello, there.") Console.WriteLine(sb)
- SecurityPermission for the ability to call unmanaged code when creating an instance of a delegate. Associated enumeration: SecurityPermissionFlag.UnmanagedCode
- ReflectionPermission for accessing a nonpublic type when the grant set of the nonpublic type is restricted to the caller's grant set, or to a subset thereof. Associated enumeration: System.Security.Permissions.ReflectionPermissionFlag.RestrictedMemberAccess
- ReflectionPermission for accessing nonpublic types regardless of their grant sets. Associated enumeration: ReflectionPermissionFlag.MemberAccess
Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter EditionThe Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.