I've written a class library that reads from an xml file and return the result as a string. But when I want to install it as a COM+ component, an error occurred (Error Code: 80131501). I checked the event log and the details of the error is:
Installation of 'C:\Users\User\Documents\Visual Studio 2005\Projects\InteropSOA\InteropSOA\bin\Debug\InteropSOA.dll' into '{28E82165-AD74-4E16-90C9-0C5CE7DA97AA}' failed with an exception: System.EnterpriseServices.RegistrationException: FATAL: Could not find component 'InteropSOA.ConfigReader' we just installed. at System.EnterpriseServices.RegistrationDriver.InstallAssembly(RegistrationConfig regConfig, Object obSync) at System.EnterpriseServices.RegistrationHelper.InstallAssemblyFromConfig(RegistrationConfig& regConfig) at System.EnterpriseServices.RegistrationHelper.InstallAssembly(String assembly, String& application, String partition, String& tlb, InstallationFlags installFlags) at System.EnterpriseServices.Internal.ComManagedImportUtil.InstallAssembly(String asmpath, String parname, String appname)
Below are the steps I've done while developing the class library:
Added "System.EnterpriseServices" to Reference.
Imported the reference to the class.
Declared the class as "ServicedComponent".
Set project properties ("Make assembly COM-visible" checked, "Register for COM Interop" checked, Signed the assembly with a strong key file name.)
Here are my codes:
using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.Xml.XPath;
using System.EnterpriseServices;
namespace InteropSOA
{
public class ConfigReader : ServicedComponent
{
// xml file name
private string strFileName;
// type of request
private string strRequest = "";
// response string
private string strResponse = "";
// declarations for xPath
private XPathDocument doc;
private XPathNavigator nav;
private XPathExpression expr;
private XPathNodeIterator iterator;
private XmlTextReader reader;
private XmlDocument xmlDoc;
public ConfigReader(string strFile, string request)
{
this.strFileName = strFile;
this.strRequest = request;
}
public ConfigReader()
{
//default contructor
}
// reader for console program
public void ReadXML()
{
doc = new XPathDocument(strFileName);
nav = doc.CreateNavigator();
// compile xPath expression
expr = nav.Compile("/Msg/" + strRequest + "/*");
iterator = nav.Select(expr);
// interate on the node set
try
{
while (iterator.MoveNext())
{
XPathNavigator nav2 = iterator.Current.Clone();
strResponse += nav2.Value + "|";
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
strResponse = strResponse.Substring(0, strResponse.Length-1);
Console.WriteLine("Response string = " + strResponse);
}
public void WriteXML(string strRequest, string strElement, string strValue)
{
reader = new XmlTextReader(strFileName);
xmlDoc = new XmlDocument();
xmlDoc.Load(reader);
reader.Close();
XmlNode node;
XmlElement root = xmlDoc.DocumentElement;
node = root.SelectSingleNode("/Msg/" + strRequest + "/" + strElement);
node.InnerText = strValue;
xmlDoc.Save(strFileName);
}
// reader for ASP.NET
public string ReadXMLElement()
{
doc = new XPathDocument(strFileName);
nav = doc.CreateNavigator();
// compile xPath expression
expr = nav.Compile("/Msg/" + strRequest + "/*");
iterator = nav.Select(expr);
// interate on the node set
try
{
while (iterator.MoveNext())
{
XPathNavigator nav2 = iterator.Current.Clone();
strResponse += nav2.Value + "|";
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
strResponse = strResponse.Substring(0, strResponse.Length - 1);
return strResponse;
}
}
}
