AppDomain::CreateInstanceFrom Method (String, String, array<Object>)
Creates a new instance of the specified type defined in the specified assembly file.
Assembly: mscorlib (in mscorlib.dll)
public: virtual ObjectHandle^ CreateInstanceFrom( String^ assemblyFile, String^ typeName, array<Object^>^ activationAttributes ) sealed
Parameters
- assemblyFile
- Type: System::String
The name, including the path, of a file that contains an assembly that defines the requested type. The assembly is loaded using the LoadFrom method.
- typeName
- Type: System::String
The fully qualified name of the requested type, including the namespace but not the assembly, as returned by the Type::FullName property.
- activationAttributes
- Type: array<System::Object>
An array of one or more attributes that can participate in activation. Typically, an array that contains a single UrlAttribute object. The UrlAttribute specifies the URL that is required to activate a remote object.
Return Value
Type: System.Runtime.Remoting::ObjectHandleAn object that is a wrapper for the new instance, or nullptr if typeName is not found. The return value needs to be unwrapped to access the real object.
Implements
_AppDomain::CreateInstanceFrom(String, String, array<Object>)| Exception | Condition |
|---|---|
| ArgumentNullException | assemblyFile is nullptr. |
| FileNotFoundException | assemblyFile was not found. |
| TypeLoadException | typeName was not found in assemblyFile. |
| MethodAccessException | The caller does not have sufficient permission to call this constructor. |
| MissingMethodException | No matching public constructor was found. |
| NotSupportedException | The caller cannot provide activation attributes for an object that does not inherit from MarshalByRefObject. |
| AppDomainUnloadedException | The operation is attempted on an unloaded application domain. |
| BadImageFormatException | assemblyFile is not a valid assembly. -or- Version 2.0 or later of the common language runtime is currently loaded and assemblyFile was compiled with a later version. |
| FileLoadException | An assembly or module was loaded twice with two different evidences. |
| NullReferenceException | This instance is nullptr. |
The default constructor for typeName is invoked.
The activationAttributes parameter is related to client-activated objects; see Client Activation.
For more information about this method, see the Activator::CreateInstanceFrom method.
When the CreateInstanceFrom method is used to create an instance in a target application domain, other than the application domain from which the call is made, the assembly is loaded in the target application domain. However, if the instance is unwrapped in the calling application domain, using the unwrapped instance in certain ways can cause the assembly to be loaded into the calling application domain. For example, after the instance is unwrapped, its type information might be requested, in order to call its methods late-bound. When the assembly is loaded into the calling application domain, exceptions can occur.
If another version of the same assembly was previously loaded into the calling application domain, or if the load path of the calling application domain is different from that of the target application domain, exceptions such as MissingMethodException can occur.
If the calling application domain makes early-bound calls to the instance type, InvalidCastException can be thrown when an attempt is made to cast the instance.
- FileIOPermissionAccess
for the ability to access the location of the assembly. Associated enumeration: FileIOPermissionAccess::PathDiscovery
- FileIOPermissionAccess
for the ability to read the file containing the assembly manifest. Associated enumeration: FileIOPermissionAccess::Read
- WebPermission
for the ability to access the location of the assembly if the assembly is not local.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.