Creating Application Pools Using System.DirectoryServices

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Internet Service Providers (ISPs) that provide Web hosting services to customers need to configure their IIS servers frequently. Some ISPs use forms to programmatically enroll a new customer and add a new Web site or virtual directory for them. The new site or virtual directory can be put in a new application pool to isolate it from other applications on the server.

Example Code

The following example shows you how to use the C# programming language to create a new application pool, then create a virtual directory and assign it to the new application pool.

Note:
In IIS 5.1 and earlier versions, application pools are not available.

To keep this code example concise, it does not include code access security (CAS) parameters or parameter checking. For more information, see Code Access Security and Validating User Input to Avoid Attacks. Additionally, you can instantiate your System.DirectoryServices.DirectoryEntry object with an authentication parameter.

Visual Basic


Imports System
Imports System.IO
Imports System.DirectoryServices
Imports System.Reflection
Imports System.Runtime.InteropServices
Imports System.Collections

Module Program

    Sub Main(ByVal args() As String)


...


CreateVDir("IIS://Localhost/W3SVC/1/Root", "MyVDir", "D:\Inetpub\Wwwroot")


...


AssignVDirToAppPool("IIS://Localhost/W3SVC/1/Root/MyVDir", "MyAppPool")


...


End Sub


...


Sub CreateAppPool(ByVal strMetabasePath As String, ByVal strAppPoolName As String)
    ' strMetabasePath is of the form "IIS://<servername>/W3SVC/AppPools"
    '   For example: "IIS://localhost/W3SVC/AppPools" 
    ' strAppPoolName is of the form "<name>", for example, "MyAppPool"
    Console.WriteLine(vbLf + "Creating application pool named {0}/{1}:", strMetabasePath, strAppPoolName)

    Try
        If strMetabasePath.EndsWith("/W3SVC/AppPools") Then
            Dim objNewPool As DirectoryEntry
            Dim objAppPools As New DirectoryEntry(strMetabasePath)
            objNewPool = objAppPools.Children.Add(strAppPoolName, "IIsApplicationPool")
            objNewPool.CommitChanges()
            Console.WriteLine("Done.")
        Else
            Console.WriteLine("Failed in CreateAppPool; application pools can only be created in the */W3SVC/AppPools node.")
        End If
    Catch exError As Exception
        Console.WriteLine("Failed in CreateAppPool with the following exception: " + vbLf + "{0}", exError.Message)
    End Try

End Sub


...


Sub CreateVDir(ByVal strMetabasePath As String, ByVal strVdirName As String, ByVal strPhysicalPath As String)
    ' strMetabasePath is of the form "IIS://<servername>/<service>/<siteID>/Root[/<vdir>]"
    '   For example: "IIS://localhost/W3SVC/1/Root" 
    ' strVdirName is of the form "<name>", for example, "MyNewVDir"
    ' strPhysicalPath is of the form "<drive>:\<path>", for example, "C:\Inetpub\Wwwroot"
    Console.WriteLine(vbLf + "Creating virtual directory {0}/{1}, mapping the Root application to {2}:", strMetabasePath, strVdirName, strPhysicalPath)

    Try
        Dim objSite As New DirectoryEntry(strMetabasePath)
        Dim strClassName As String = objSite.SchemaClassName.ToString()
        If strClassName.EndsWith("Server") OrElse strClassName.EndsWith("VirtualDir") Then
            Dim objVdirs As DirectoryEntries = objSite.Children
            Dim objNewVdir As DirectoryEntry = objVdirs.Add(strVdirName, strClassName.Replace("Service", "VirtualDir"))
            objNewVdir.Properties("Path")(0) = strPhysicalPath
            objNewVdir.Properties("AccessScript")(0) = True
            ' These properties are necessary for an application to be created.
            objNewVdir.Properties("AppFriendlyName")(0) = strVdirName
            objNewVdir.Properties("AppIsolated")(0) = "1"
            objNewVdir.Properties("AppRoot")(0) = "/LM" + strMetabasePath.Substring(strMetabasePath.IndexOf("/", "IIS://".Length))
            objNewVdir.CommitChanges()
            Console.WriteLine("Done.")
        Else
            Console.WriteLine("Failed. A virtual directory can only be created in a site or virtual directory node.")
        End If
    Catch exError As Exception
        Console.WriteLine("Failed in CreateVDir with the following exception: " + vbLf + "{0}", exError.Message)
    End Try

End Sub


...


Sub AssignVDirToAppPool(ByVal strMetabasePath As String, ByVal strAppPoolName As String)
    ' strMetabasePath is of the form "IIS://<servername>/W3SVC/<siteID>/Root[/<vDir>]"
    '   For example: "IIS://localhost/W3SVC/1/Root/MyVDir" 
    ' strAppPoolName is of the form "<name>", for example, "MyAppPool"
    Console.WriteLine(vbLf + "Assigning application {0} to the application pool named {1}:", strMetabasePath, strAppPoolName)

    Try
        Dim objVdir As New DirectoryEntry(strMetabasePath)
        Dim strClassName As String = objVdir.SchemaClassName.ToString()
        If strClassName.EndsWith("VirtualDir") Then
            Dim objParam As Object() = {0, strAppPoolName, True}
            objVdir.Invoke("AppCreate3", objParam)
            objVdir.Properties("AppIsolated")(0) = "2"
            Console.WriteLine("Done.")
        Else
            Console.WriteLine("Failed in AssignVDirToAppPool; only virtual directories can be assigned to application pools")
        End If
    Catch exError As Exception
        Console.WriteLine("Failed in AssignVDirToAppPool with the following exception: " + vbLf + "{0}", exError.Message)
    End Try

End Sub


...


End Module


using System;
using System.IO;
using System.DirectoryServices;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Collections;

namespace System_DirectoryServices_DirectoryEntry_ConfigIIS
{
  class Program
  {
    static void Main(string[] args)
    {


...


CreateAppPool("IIS://Localhost/W3SVC/AppPools", "MyAppPool");


...


CreateVDir("IIS://Localhost/W3SVC/1/Root", "MyVDir", "D:\\Inetpub\\Wwwroot");


...


AssignVDirToAppPool("IIS://Localhost/W3SVC/1/Root/MyVDir", "MyAppPool");


...


}


...


static void CreateAppPool(string metabasePath, string appPoolName)
{
  //  metabasePath is of the form "IIS://<servername>/W3SVC/AppPools"
  //    for example "IIS://localhost/W3SVC/AppPools" 
  //  appPoolName is of the form "<name>", for example, "MyAppPool"
  Console.WriteLine("\nCreating application pool named {0}/{1}:", metabasePath, appPoolName);

  try
  {
    if (metabasePath.EndsWith("/W3SVC/AppPools"))
    {
      DirectoryEntry newpool;
      DirectoryEntry apppools = new DirectoryEntry(metabasePath);
      newpool = apppools.Children.Add(appPoolName, "IIsApplicationPool");
      newpool.CommitChanges();
      Console.WriteLine(" Done.");
    }
    else
      Console.WriteLine(" Failed in CreateAppPool; application pools can only be created in the */W3SVC/AppPools node.");
  }
  catch (Exception ex)
  {
    Console.WriteLine("Failed in CreateAppPool with the following exception: \n{0}", ex.Message);
  }
}


...


static void CreateVDir(string metabasePath, string vDirName, string physicalPath)
{
  //  metabasePath is of the form "IIS://<servername>/<service>/<siteID>/Root[/<vdir>]"
  //    for example "IIS://localhost/W3SVC/1/Root" 
  //  vDirName is of the form "<name>", for example, "MyNewVDir"
  //  physicalPath is of the form "<drive>:\<path>", for example, "C:\Inetpub\Wwwroot"
  Console.WriteLine("\nCreating virtual directory {0}/{1}, mapping the Root application to {2}:",
      metabasePath, vDirName, physicalPath);

  try
  {
    DirectoryEntry site = new DirectoryEntry(metabasePath);
    string className = site.SchemaClassName.ToString();
    if ((className.EndsWith("Server")) || (className.EndsWith("VirtualDir")))
    {
      DirectoryEntries vdirs = site.Children;
      DirectoryEntry newVDir = vdirs.Add(vDirName, (className.Replace("Service", "VirtualDir")));
      newVDir.Properties["Path"][0] = physicalPath;
      newVDir.Properties["AccessScript"][0] = true;
      // These properties are necessary for an application to be created.
      newVDir.Properties["AppFriendlyName"][0] = vDirName;
      newVDir.Properties["AppIsolated"][0] = "1";
      newVDir.Properties["AppRoot"][0] = "/LM" + metabasePath.Substring(metabasePath.IndexOf("/", ("IIS://".Length)));

      newVDir.CommitChanges();

      Console.WriteLine(" Done.");
    }
    else
      Console.WriteLine(" Failed. A virtual directory can only be created in a site or virtual directory node.");
  }
  catch (Exception ex)
  {
    Console.WriteLine("Failed in CreateVDir with the following exception: \n{0}", ex.Message);
  }
}


...


static void AssignVDirToAppPool(string metabasePath, string appPoolName)
{
  //  metabasePath is of the form "IIS://<servername>/W3SVC/<siteID>/Root[/<vDir>]"
  //    for example "IIS://localhost/W3SVC/1/Root/MyVDir" 
  //  appPoolName is of the form "<name>", for example, "MyAppPool"
  Console.WriteLine("\nAssigning application {0} to the application pool named {1}:", metabasePath, appPoolName);

  try
  {
    DirectoryEntry vDir = new DirectoryEntry(metabasePath);
    string className = vDir.SchemaClassName.ToString();
    if (className.EndsWith("VirtualDir"))
    {
      object[] param = { 0, appPoolName, true };
      vDir.Invoke("AppCreate3", param);
      vDir.Properties["AppIsolated"][0] = "2";
      Console.WriteLine(" Done.");
    }
    else
      Console.WriteLine(" Failed in AssignVDirToAppPool; only virtual directories can be assigned to application pools");
  }
  catch (Exception ex)
  {
    Console.WriteLine("Failed in AssignVDirToAppPool with the following exception: \n{0}", ex.Message);
  }
}


...


  }
}