Activator.CreateInstance Method (AppDomain, String, String)
Creates an instance of the type whose name is specified in the specified remote domain, using the named assembly and default constructor.
Assembly: mscorlib (in mscorlib.dll)
[PermissionSetAttribute(SecurityAction.LinkDemand, Unrestricted = true)] public static ObjectHandle CreateInstance( AppDomain domain, string assemblyName, string typeName )
Parameters
- domain
- Type: System.AppDomain
The remote domain where the type named typeName is created.
- assemblyName
- Type: System.String
The name of the assembly where the type named typeName is sought. If assemblyName is null, the executing assembly is searched.
- typeName
- Type: System.String
The name of the preferred type.
Return Value
Type: System.Runtime.Remoting.ObjectHandleA handle that must be unwrapped to access the newly created instance.
| Exception | Condition |
|---|---|
| ArgumentNullException | typeName or domain is null. |
| 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. |
| MemberAccessException | Cannot create an instance of an abstract type. -or- This member was invoked with a late-binding mechanism. |
| TargetInvocationException | The constructor, which was invoked through reflection, threw an exception. |
| InvalidComObjectException | The COM type was not obtained through GetTypeFromProgID or GetTypeFromCLSID. |
| NotSupportedException | Creation of TypedReference, ArgIterator, Void, and RuntimeArgumentHandle types, or arrays of those types, is not supported. |
| BadImageFormatException | assemblyName is not a valid assembly. -or- 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. |
| FileLoadException | An assembly or module was loaded twice with two different evidences. |
Use CreateInstance when a host needs to execute code in an AppDomain with restricted security permissions.
Use ObjectHandle.Unwrap to unwrap the return value.
 Note: |
|---|
This method uses SecurityAction.LinkDemand to require the immediate caller to have full trust. For important limitations on using the LinkDemand member, see Demand vs. LinkDemand. |
- LinkDemand
for full trust for the immediate caller. This member cannot be used by partially trusted code.
- 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
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
