.Net Core Microsoft.Web.Administration ServerManager from Linux

Question

.net core version: 2.1.500

OS: Debian 9 (4.9.0-8-amd64 #1 SMP Debian 4.9.130-2 (2018-10-27) x86_64 GNU/Linux )

I am trying to stop/start application pool from Linux OS via ServerManager but no success. According api catalog it should works: https://apisof.net/catalog/Microsoft.Web.Administration.ServerManager

ServerManager.OpenRemote() throw NullReference exception when trying to ApplicationPools:

// also trying ip adress
using (ServerManager manager = ServerManager.OpenRemote("someserver"))
{
    try
    {
        if (manager.ApplicationPools == null) /* <= Here is exception!!! */
        {
            Console.WriteLine("ApplicationPool is null!");
        }
        else
        {
            foreach (var item in manager.ApplicationPools)
            {
                Console.WriteLine("  " + item.Name);
            }
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine("Exception: " + ex.Message);
        Console.WriteLine(" Trace=" + ex.StackTrace);
    }
}

Result:

Exception: Object reference not set to an instance of an object.
Trace= at Microsoft.Web.Administration.ConfigurationManager.CreateWritableAdminManager(WebConfigurationMap webConfigMap, String configPathToEdit, Boolean isAdminConfig, Boolean isRedirectionConfig) at Microsoft.Web.Administration.ConfigurationManager.CreateConfiguration(WebConfigurationMap configMap, String configPathToEdit, Boolean isAdminConfig, Boolean isRedirectionConfig) at Microsoft.Web.Administration.ConfigurationManager.GetConfiguration(String rawConfigurationPath, String cacheKey, Boolean isAdminConfig, Boolean isRedirectionConfig) at Microsoft.Web.Administration.ServerManager.ApplicationPoolsSectionCreator() at Microsoft.Web.Administration.Lazy.Initialize[T](T& target, CreateInstanceDelegate1 valueFactory) at Microsoft.Web.Administration.ServerManager.ApplicationPoolCollectionCreator() at Microsoft.Web.Administration.Lazy.Initialize[T](T& target, CreateInstanceDelegate1 valueFactory) at SomeMethod() in some_file.cs:line 123

When ServerManager creates via constructor that take string ApplicationPools throws System.PlatformNotSupportedException exception:

using (ServerManager manager = new ServerManager(@"\\someserver\IISSharedConfig\applicationHost.config"))
{
    try
    {
        if (manager.ApplicationPools == null) /* <= Here is exception!!! */
        {
            Console.WriteLine("ApplicationPool is null!");
        }
        else
        {
            foreach (var item in manager.ApplicationPools)
            {
                Console.WriteLine("  " + item.Name);
            }
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine("Exception: " + ex.Message);
        Exception e = ex.InnerException;
        while (e != null)
        {
            Console.WriteLine("InnerException: " + e.Message);
            e = e.InnerException;
        }
        Console.WriteLine(" Trace=" + ex.StackTrace);
    }
}

Result:

Exception: Exception has been thrown by the target of an invocation. InnerException: COM is not supported Trace= at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean wrapExceptions, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor) at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean wrapExceptions, Boolean skipCheckThis, Boolean fillCache) at System.Activator.CreateInstanceT at Microsoft.Web.Administration.ConfigurationManager.CreateAdminManager[TClass,TInterface](WebConfigurationMap webConfigMap, Boolean isAdminConfig, Boolean isRedirectionConfig) at Microsoft.Web.Administration.ConfigurationManager.CreateWritableAdminManager(WebConfigurationMap webConfigMap, String configPathToEdit, Boolean isAdminConfig, Boolean isRedirectionConfig) at Microsoft.Web.Administration.ConfigurationManager.CreateConfiguration(WebConfigurationMap configMap, String configPathToEdit, Boolean isAdminConfig, Boolean isRedirectionConfig) at Microsoft.Web.Administration.ConfigurationManager.GetConfiguration(String rawConfigurationPath, String cacheKey, Boolean isAdminConfig, Boolean isRedirectionConfig) at Microsoft.Web.Administration.ServerManager.ApplicationPoolsSectionCreator() at Microsoft.Web.Administration.Lazy.Initialize[T](T& target, CreateInstanceDelegate1 valueFactory) at Microsoft.Web.Administration.ServerManager.ApplicationPoolCollectionCreator() at Microsoft.Web.Administration.Lazy.Initialize[T](T& target, CreateInstanceDelegate1 valueFactory) at SomeMethod() in some_file.cs:line 123

How to use ServerManager in Linux?

Itay Podhajcer Itay Podhajcer · Accepted Answer · 2018-12-06T14:12:24

I believe what you are trying to do isn't supported on Linux. See at the bottom of the link you posted in your question:

Platform

.NET Standard + Platform Extensions

As far as I remember, the Platform Extensions are additions that are not cross platform, thus cannot be used in an application running on Linux.

You can also see a hint to that in the second error you posted:

COM is not supported

Which is true on Linux.

Hope it helps!

.Net Core Microsoft.Web.Administration ServerManager from Linux

1 Answers