FIX: You receive an "An exception occurred" error message when you use a .NET class in the Business Rule Composer

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Article ID: 885448 - View products that this article applies to.
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SYMPTOMS

In Microsoft BizTalk Server 2004, when you test a policy that calls a method in a .NET class in the Business Rule Composer or in BizTalk Orchestration Designer, you may receive an error message that is similar to the following error message:
An exception occurred when invoking class member MyNamespace.MyClass.MyMethod in assembly MyNamespace, Version=1.0.0.0, Culture=neutral, PublicKeyToken=060d33ae94d9c706. Object type cannot be converted to target type

CAUSE

This problem occurs when the method that you are calling contains a parameter that is an enumeration.

The following is an example of an Add method of a .NET class that produces this error message when the method is called from inside the Business Rule Composer or from inside the BizTalk Orchestration Designer.
using System;
using System.Collections;
using System.IO;
using System.Xml;
using Microsoft.RuleEngine;
namespace MyNamespace
{
/// <summary>
/// Summary description for MyClass.
/// </summary>
[Serializable]
public class MyClass
	{
	public enum MyEnum
		{
		first,
		second
		};
	ArrayList myAL;

	public MyClass()
		{
		myAL = new ArrayList();
		}
	
	public int Add(string myString, MyEnum myEnum)
		{
		myAL.Add(myString);
		return 1;
		}

	public int Add(string myString)
		{
		myAL.Add(myString);
		return 1;
		} 
	}
.....
}

RESOLUTION

Service pack information

To resolve this problem, obtain the latest service pack for Microsoft BizTalk Server 2004. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
888751 How to obtain the latest BizTalk Server 2004 service pack

Hotfix information

Prerequisites

No prerequisites are required.

Restart requirement

You do not have to restart your computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
   Date         Time   Version            Size    File name
   --------------------------------------------------------------
   17-Sep-2004  16:46  3.0.5343.0        708,608  Microsoft.ruleengine.dll  

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was corrected in BizTalk Server 2004 Service Pack 1.

MORE INFORMATION

For more information about developing business rules in BizTalk Server 2004, visit the following Microsoft Developer Network (MSDN) Web site:
http://msdn2.microsoft.com/en-us/library/ms947044.aspx
For additional information about the standard terminology that is used to describe Microsoft software updates, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Properties

Article ID: 885448 - Last Review: February 14, 2007 - Revision: 3.2
APPLIES TO
  • Microsoft BizTalk Server 2004 Standard Edition
  • Microsoft BizTalk Server 2004 Partner Edition
  • Microsoft BizTalk Server 2004 Enterprise Edition
  • Microsoft BizTalk Server 2004 Developer Edition
Keywords: 
kbbiztalk2004sp1fix kbfix kbbug kbprb kbhotfixserver kbqfe KB885448

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