Activator.CreateInstance Method (String, String)
Assembly: mscorlib (in mscorlib.dll)
public static function CreateInstance ( assemblyName : String, typeName : String ) : ObjectHandle
The name of the assembly where the type named typeName is sought. If assemblyName is a null reference (Nothing in Visual Basic), the executing assembly is searched.
The name of the preferred type.
Return ValueA handle that must be unwrapped to access the newly created instance.
typeName is a null reference (Nothing in Visual Basic).
No matching public constructor was found.
typename was not found in assemblyName.
assemblyName was not found.
The caller does not have permission to call this constructor.
You cannot create an instance of an abstract class, or this member was invoked with a late-binding mechanism.
The constructor, which was invoked through reflection, threw an exception.
assemblyName is not a valid assembly.
The common language runtime (CLR) version 2.0 or later is currently loaded, and assemblyName was compiled for a version of the CLR that is later than the currently loaded version. Note that the .NET Framework versions 2.0, 3.0, and 3.5 all use CLR version 2.0.
An assembly or module was loaded twice with two different evidences.
Use ObjectHandle.Unwrap to unwrap the return value.
Starting with the , this method can be used to create 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.
- 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 set. 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.