AppDomain.CreateInstanceFrom Method (String, String)
Creates a new instance of the specified type defined in the specified assembly file.
[Visual Basic] Overloads Public Overridable Function CreateInstanceFrom( _ ByVal assemblyFile As String, _ ByVal typeName As String _ ) As ObjectHandle Implements _AppDomain.CreateInstanceFrom [C#] public virtual ObjectHandle CreateInstanceFrom( string assemblyFile, string typeName ); [C++] public: virtual ObjectHandle* CreateInstanceFrom( String* assemblyFile, String* typeName ); [JScript] public function CreateInstanceFrom( assemblyFile : String, typeName : String ) : ObjectHandle;
- The name of a file that contains an assembly that defines the requested type.
- The fully-qualified name of the requested type.
An object that is a wrapper for the new instance, or a null reference (Nothing in Visual Basic) if typeName is not found. The return value needs to be unwrapped to access the real object.
|SecurityException||The caller does not have the correct permissions. See the requirements section.|
|ArgumentNullException||assemblyFile is a null reference (Nothing in Visual Basic).
typeName is a null reference (Nothing).
The default constructor for typeName is invoked.
For more information, see the Activator.CreateInstanceFrom method.
An attempt to call CreateInstanceFrom on a target application domain that is not the current application domain will result in a successful load of the assembly in the target application domain. Since an Assembly is not MarshalByRefObject, when this method attempts to return the Assembly for the loaded assembly to the current application domain, the common language runtime will try to load the assembly into the current application domain and the load might fail. The assembly that is loaded into the current application domain might be different from the assembly that was loaded first if the path settings for the two application domains are different.
Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family
.NET Framework Security:
- FileIOPermissionAccess for the ability to access the location of the assembly. Associated enumeration: PathDiscovery
- FileIOPermissionAccess for the ability to read the file containing the assembly manifest. Associated enumeration: Read
- WebPermission for the ability to access the location of the assembly if the assembly is not local.
- ReflectionPermission when invoked late-bound through mechanisms such as Type.InvokeMember. Associated enumeration: ReflectionPermissionFlag.MemberAccess.
- AppDomainUnloadedException Operations are attempted on an unloaded application domain.