Activator.CreateInstance Method (String, String, Object)
Creates an instance of the type whose name is specified, using the named assembly and default constructor.
Assembly: mscorlib (in mscorlib.dll)
public static ObjectHandle CreateInstance( string assemblyName, string typeName, Object activationAttributes )
- Type: System.String
The name of the assembly where the type named typeName is sought. If assemblyName is null, the executing assembly is searched.
- Type: System.String
The fully qualified name of the preferred type.
Return ValueType: System.Runtime.Remoting.ObjectHandle
A handle that must be unwrapped to access the newly created instance.
typeName is null.
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.
Cannot create an instance of an abstract class, or this member was invoked with a late-binding mechanism.
activationAttributes is not an empty array, and the type being created does not derive from MarshalByRefObject.
activationAttributes is not a UrlAttribute
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.
The assembly name or code base is invalid.
An error occurred when attempting remote activation in a target specified in activationAttributes.
Use ObjectHandle.Unwrap to unwrap the return value.
The activationAttributes parameter is related to client-activated objects; see Client Activation.
Starting with the .NET Framework 2.0 Service Pack 1, this method can be used to create nonpublic types if the caller has been granted ReflectionPermission with the ReflectionPermissionFlag.RestrictedMemberAccess flag and if the grant set of 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 .NET Framework 3.5 or later.
for the ability to call unmanaged code when creating an instance of a delegate. Associated enumeration: SecurityPermissionFlag.UnmanagedCode
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: ReflectionPermissionFlag.RestrictedMemberAccess
for accessing nonpublic types regardless of their grant set. Associated enumeration: ReflectionPermissionFlag.MemberAccess
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.