AppDomain.CreateInstance Method (String, String, Object)
Creates a new instance of the specified type defined in the specified assembly. A parameter specifies an array of activation attributes.
[Visual Basic] Overloads Public Overridable Function CreateInstance( _ ByVal assemblyName As String, _ ByVal typeName As String, _ ByVal activationAttributes() As Object _ ) As ObjectHandle Implements _AppDomain.CreateInstance [C#] public virtual ObjectHandle CreateInstance( string assemblyName, string typeName, object activationAttributes ); [C++] public: virtual ObjectHandle* CreateInstance( String* assemblyName, String* typeName, Object* activationAttributes __gc ); [JScript] public function CreateInstance( assemblyName : String, typeName : String, activationAttributes : Object ) : ObjectHandle;
- The display name of the assembly.
- The fully-qualified name of the requested type.
- One or more attributes that can participate in activation.
An object that is a wrapper for the new instance specified by typeName. The return value needs to be unwrapped to access the real object.
|ArgumentNullException||assemblyName or typeName is a null reference (Nothing in Visual Basic).|
|MissingMethodException||No matching public constructor was found.|
|TypeLoadException||typename was not found in assemblyName.|
|FileNotFoundException||assemblyName was not found.|
|MethodAccessException||The caller does not have permission to call this constructor.|
|NotSupportedException||The caller cannot provide activation attributes for an object that does not inherit from MarshalByRefObject.|
|SecurityException||The caller does not have the correct permissions. See the requirements section.|
|AppDomainUnloadedException||Operations are attempted on an unloaded application domain.|
This method calls the default constructor for typeName.
See AssemblyName for the format of assemblyName.
An attempt to call CreateInstance 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.
- SecurityPermission for the ability to call unmanaged code when creating an instance of a delegate. Associated enumeration: SecurityPermissionFlag/UnmanagedCode
- ReflectionPermission for the ability to invoke operations on all type members. Associated enumeration: ReflectionPermissionFlag/MemberAccess
- ReflectionPermission when invoked late-bound through mechanisms such as Type.InvokeMember. Associated enumeration: ReflectionPermissionFlag.MemberAccess.