Activator.CreateComInstanceFrom Method (String, String)
Creates an instance of the COM object whose name is specified, using the named assembly file and the constructor that best matches the specified parameters.
Assembly: mscorlib (in mscorlib.dll)
public static ObjectHandle CreateComInstanceFrom( string assemblyName, 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 or assemblyName is null.
An instance cannot be created through COM.
typename was not found in assemblyName.
No matching constructor was found.
assemblyName is not found, or the module you are trying to load does not specify a file name extension.
Cannot create an instance of an abstract class.
This member was invoked with a late-binding mechanism.
The caller cannot provide activation attributes for an object that does not inherit from MarshalByRefObject.
assemblyName is the empty string ("").
Use the ObjectHandle.Unwrap method to unwrap the return value.
A System.Runtime.InteropServices.ComVisibleAttribute attribute with a value of true must be applied either explicitly or by default to the COM type so the CreateComInstanceFrom method can create an instance of that type; otherwise, TypeLoadException is thrown.
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 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 .NET Framework 3.5 or later.
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