C# 取得某应用程序池中应用程序的个数

        public int GetAppNumber(string appName)
        {
            Int32 appPoolNum = 0;

            DirectoryEntry w3svc = new DirectoryEntry("IIS://localhost/W3SVC);
            foreach (DirectoryEntry child in w3svc.Children)
            {
                if (child.SchemaClassName == "IIsWebServer")
                {
                    if (child.Properties["AppPoolId"].Value.ToString() == appName)
                        ++appPoolNum;
                }
            }

            return appPoolNum;

        }

（IIS的应用程序池）