Activator.CreateInstanceFrom Method (String, String)
Creates an instance of the type whose name is specified, using the named assembly file and default constructor.
Assembly: mscorlib (in mscorlib.dll)
public static ObjectHandle CreateInstanceFrom( string assemblyFile, string typeName )
- Type: System.String
The name of a file that contains an assembly where the type named typeName is sought.
- Type: System.String
The 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 assemblyFile.
assemblyFile 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.
The constructor, which was invoked through reflection, threw an exception.
The caller does have the required FileIOPermission.
assemblyFile 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.
// Create an instance of the SomeType class that is defined in this // assembly. System.Runtime.Remoting.ObjectHandle oh = Activator.CreateInstanceFrom(Assembly.GetEntryAssembly().CodeBase, typeof(SomeType).FullName); // Call an instance method defined by the SomeType type using this object. SomeType st = (SomeType) oh.Unwrap(); st.DoSomething(5);
for the ability to call unmanaged code when creating an instance of a delegate. Associated enumeration: SecurityPermissionFlag.UnmanagedCode
for accessing nonpublic types when the grant set of the nonpublic types 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, 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.