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 )
The name of a file that contains an assembly where the type named typeName is sought.
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.
The following code example demonstrates how to call the Activator class.method. This code example is part of a larger example provided for the
// 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
Available since 1.1