CreateComInstanceFrom Method (String, String, Byte[], AssemblyHashAlgorithm)
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AppDomain.CreateComInstanceFrom Method (String, String, Byte[], AssemblyHashAlgorithm)

 

Creates a new instance of a specified COM type. Parameters specify the name of a file that contains an assembly containing the type and the name of the type.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

member CreateComInstanceFrom : 
        assemblyFile:string *
        typeName:string *
        hashValue:byte[] *
        hashAlgorithm:AssemblyHashAlgorithm -> ObjectHandle

Parameters

assemblyFile
Type: System.String

The name of a file containing an assembly that defines the requested type.

typeName
Type: System.String

The name of the requested type.

hashValue
Type: System.Byte[]

Represents the value of the computed hash code.

hashAlgorithm
Type: System.Configuration.Assemblies.AssemblyHashAlgorithm

Represents the hash algorithm used by the assembly manifest.

Return Value

Type: System.Runtime.Remoting.ObjectHandle

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.

Exception Condition
ArgumentNullException

assemblyName or typeName is null.

TypeLoadException

The type cannot be loaded.

AppDomainUnloadedException

The operation is attempted on an unloaded application domain.

MissingMethodException

No public parameterless constructor was found.

FileNotFoundException

assemblyFile is not found.

MemberAccessException

typeName is an abstract class.

-or-

This member was invoked with a late-binding mechanism.

NotSupportedException

The caller cannot provide activation attributes for an object that does not inherit from MarshalByRefObject.

ArgumentException

assemblyFile is the empty string ("").

BadImageFormatException

assemblyFile is not a valid assembly.

FileLoadException

An assembly or module was loaded twice with two different evidences.

NullReferenceException

The COM object that is being referred to is null.

Use this method to create objects remotely without having to load the type locally.

The return value must to be unwrapped to access the real object.

A System.Runtime.InteropServices.ComVisibleAttribute attribute with a value of true must be applied either explicitly or by default to the COM type for this method to create an instance of that type; otherwise, TypeLoadException is thrown.

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.

.NET Framework
Available since 1.1
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