Consume a .NET Assembly from a classic ASP page.

re: Consume a .NET Assembly from a classic ASP page.

John Burns — Tue, 03 Mar 2009 17:14:09 GMT

To make it work:

Solution properties > Compile and tick "Register for COM interop"

Solution Properties > Assembly information > tick "Make assembly COM-visible"

Ad make sure your code is importing:

Imports System

Imports System.Runtime.InteropServices

re: Consume a .NET Assembly from a classic ASP page.

Paulo — Tue, 25 Nov 2008 19:00:56 GMT

i get the same problem:

Error Type:

Server object, ASP 0177 (0x800401F3)

Invalid class string

re: Consume a .NET Assembly from a classic ASP page.

Jai Gupta — Wed, 22 Oct 2008 12:48:17 GMT

i had a J++ dll converted to j# com dll (vs2005) and want to consume it in ASP. But after creating the dll successfully which is working with VB etc. is not found to be compatible with the ASP.

1. At application level unable to set the application variable with j# com dll object. Though at session level it is possible to do so.

2. The overloaded methodds of j# com dll are not callable from ASP as they raise a error saying "Wrong/ invalid argument list"

3. The properties of a class are not accessible from the ASP

e.g

Dim i, o

Set o = CreateObject("MydllClass")

i = o.getId()

Error: Variable uses an Automation type not supported in VBScript

please help.

re: Consume a .NET Assembly from a classic ASP page.

Deepa — Wed, 04 Jun 2008 20:51:12 GMT

I have written .NET2.0 DLL and i am not able to use the same in an ASP page

I have set the assembly to Register for COM Interop.

Used regasm /codebase to register the assmebly.

Loaded the assembly in the GAc

I am able to create the object and set its properties , but when i call any of the methods

i get the following error:

Error Type:

(0x80004003)

Object reference not set to an instance of an object.

But when i try the same for a VBScript , the component works fine without errors.

Any help will be appreciated

how to register net assembly

how to register net assembly — Tue, 03 Jun 2008 14:47:28 GMT

Pingback from how to register net assembly

re: Consume a .NET Assembly from a classic ASP page.

Ray — Thu, 15 May 2008 13:09:24 GMT

Answer to Eric's question:

I had the same problem, my public method was not visible to the ASP page and intellisense would not display the method.

Try designing your application with an explicit public interface that exposes public method(s) and create a class that implements the interface.

Assign the following attribute on the COM Interface code:

[Guid("<GUID from Create GUID tool>")]

[InterfaceType(ComInterfaceType.InterfaceIsDual)]

This will create both early and late bound interfaces.

The following code snipnet shows a simple class that displays the traditional "Hello World" as a .Net component with a COM interface.

using System;

using System.Runtime.InteropServices;

namespace HelloCOM

{

[Guid("DBE0E8C4-1C61-41f3-B6A4-4E2F353D3D05")] // Unique identifier required from 'Create GUID' tool

[InterfaceType(ComInterfaceType.InterfaceIsDual)] // Dual interface provides both early and late binding

public interface IHelloCOM

{

string PrintGreeting(string userName);

}

[ComVisible(true)] // Properties and methods of this class will be visible to COM

[Guid("C6659361-1625-4746-931C-36014B146679")] // Unique identifier required from 'Create GUID' tool

[ProgId("HelloCOM.HelloCOMImplementation")] // Name used when invoking this component [e.g. CreateObject("HelloCOM.HelloCOMImplementation")]

[ClassInterface(ClassInterfaceType.None)] // 'ClassInterfaceType.None' is only way to expose functionality through interfaces implemented explicitly by the class

[ComSourceInterfaces(typeof(IHelloCOM))] // Identifies the interface that will be exposed as COM event sources for the attributed class

public class HelloCOMImplementation : IHelloCOM

{

public HelloCOMImplementation() { } // Default albeit empty constructor that is required for COM instantiation

string IHelloCOM.PrintGreeting(string userName) // Implementation of the PrintGreeting() method defined in the interface

{

string greeting = string.Empty;

greeting = "Hello COM world from " + userName;

return greeting;

}

Hope this helps.

re: Consume a .NET Assembly from a classic ASP page.

Sri — Fri, 25 Apr 2008 13:41:54 GMT

Jay

I have managed find a way around the problem you have, I have used an array list in the example but u should be able to do the same with an Array

example is here tsqldotnet.spaces.live.com

re: Consume a .NET Assembly from a classic ASP page.

LRN — Wed, 16 Apr 2008 09:38:58 GMT

Great Article! very useful.I have problem .NET assembly (Assembly1) references .NET assembly (Assembly2) both i have registered as COM.

I creted new method A() in Class1 in Assesmbly1 which calls method B() from Class2 in Assesmbly2.

when i call method A() in asp i get "Invalid string error"

Does anyone know what the issue is? Can we have refernces to the .NET dll? Is there any other way to acheive this?

re: Consume a .NET Assembly from a classic ASP page.

Jay — Fri, 11 Apr 2008 03:02:41 GMT

I have a problem returning an array from the .net dll to an asp page. Does any one have the same issue?

re: Consume a .NET Assembly from a classic ASP page.

Jay — Fri, 11 Apr 2008 03:02:41 GMT

I have a problem returning an array from the .net dll to an asp page. Does any one have the same issue?