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AppDomain.CreateComInstanceFrom Method (String, String)

 

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)

public ObjectHandle CreateComInstanceFrom(
	string assemblyName,
	string typeName
)

Parameters

assemblyName
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.

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

assemblyName 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

assemblyName is an empty string ("").

BadImageFormatException

assemblyName 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.

ASystem.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.

The following sample demonstrates

using System;
using System.Reflection;
using System.Runtime.InteropServices;

[ComVisible(true)]
class MyComVisibleType {
   public MyComVisibleType() {
      Console.WriteLine("MyComVisibleType instantiated!");
   }
}

[ComVisible(false)]
class MyComNonVisibleType {
   public MyComNonVisibleType() {
      Console.WriteLine("MyComNonVisibleType instantiated!");
   }
}

class Test {
   public static void Main() {
      CreateComInstance("MyComNonVisibleType");   // Fail!
      CreateComInstance("MyComVisibleType");      // OK!
   }

   static void CreateComInstance(string typeName) {
      try {
         AppDomain currentDomain = AppDomain.CurrentDomain;
         string assemblyName = currentDomain.FriendlyName;
         currentDomain.CreateComInstanceFrom(assemblyName, typeName);
      } catch (Exception e) {
         Console.WriteLine(e.Message);
      }
   }
}

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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