.NET Framework - BindCommandLineParametersNoValidation for [System.Net.Dns]::Resolve([System.Net.Dns]::GetHostName())

Asked By rferrisx

08-Jul-08 07:49 AM

This works:
[System.Net.Dns]::Resolve([System.Net.Dns]::GetHostName())

and this works also:
$hostnameX =
[System.Net.Dns]::Resolve([System.Net.Dns]::GetHostName())

However, this does not:
function hostnameX
[System.Net.Dns]::Resolve([System.Net.Dns]::GetHostName())

My $StackTrace says:

System.Management.Automation.CmdletParameterBinderController.BindCommandLineParametersNoValidation(Collection`1
arguments)"

07-Jul-08 02:45 PM

PS>get-help about_function
...
function | filter
[<scope_type>:]<name>
{ param()  }
...

I don't see your curlies... ;-)

XP SP2, v2 CTP2, with curlies, that works fine.

Marco

--
*Microsoft MVP - Windows Server - Admin Frameworks
https://mvp.support.microsoft.com/profile/Marco.Shaw
*PowerShell Co-Community Director - http://www.powershellcommunity.org
*Blog - http://marcoshaw.blogspot.com

08-Jul-08 09:12 PM

Also note that [System.Net.Dns]::Resolve() is obsolete as are most of the
static methods of this class.
http://msdn.microsoft.com/en-us/library/system.net.dns_members.aspx  The
recommended alternative is [System.Net.Dns]::GetHostEntry()

12-Jul-08 01:00 AM

em.net.dns_members.aspx=A0The

Kuma:

Thanks for this information. Could you possibly help me understand why
there are different object names if I pipe my variable to "fl *" than
otherwise? For example below

this won't work:  $hostname_Y.computername
but this will: $hostname_Y.hostname

Also, no "IPAddressToString" method is provided for
[System.Net.Dns]::GetHostEntry()

as is provided for [System.Net.IPAddress]


[System.Net.IPAddress]::Broadcast.IPAddressToString
or
[System.Net.IPAddress]::Loopback.IPAddressToString

Thanks,

Ryan



$hostname_Y =3D [System.Net.Dns]::GetHostEntry("rmfmedia")
$hostname_Y

ComputerName    Aliases         Addresses
------------    -------         ---------
rmfmedia        {}              {192.168.0.5}

$hostname_Y | fl *
HostName    : rmfmedia
Aliases     : {}
AddressList : {192.168.0.5}

$hostname_Y.AddressList


Address         : 83929280
AddressFamily   : InterNetwork
ScopeId         :
IsIPv6Multicast : False
IsIPv6LinkLocal : False
IsIPv6SiteLocal : False

16-Jul-08 01:16 AM

When you pipe it to format-list it changes the object type. Probably
for formatting it to display it on the screen.

PoSh [14] =BB ([System.Net.DNS]::GetHostEntry("computer")).Gettype()

IsPublic IsSerial Name                                     BaseType
-------- -------- ----                                     --------
True     False    IPHostEntry
System.Object


PoSh [15] =BB ([System.Net.DNS]::GetHostEntry("computer")| fl
*).Gettype()

IsPublic IsSerial Name                                     BaseType
-------- -------- ----                                     --------
True     True     Object[]
System.Array


Thats because GetHostEntry() returns an IPHostEntry which contains a
collection of IPAddress objects in its AddressList collection. The
informations is still there just buried a little bit.

PoSh [22] =BB [System.Net.DNS]::GetHostEntry("computer")

HostName
Aliases                                 AddressList
--------
-------                                 -----------
computer.windows.nobody.nowhere.com
{}                                      {12.12.12.12}


PoSh [23] =BB ([System.Net.DNS]::GetHostEntry("computer")).AddressList


IPAddressToString : 12.12.12.12
Address           : 4583216589
AddressFamily     : InterNetwork
ScopeId           :
IsIPv6Multicast   : False
IsIPv6LinkLocal   : False
IsIPv6SiteLocal   : False



PoSh [24]
=BB ([System.Net.DNS]::GetHostEntry("computer")).AddressList[0].IPAddressTo=
String
12.12.12.12

Hope that helps clear stuff up a bit. Remember to use Get-Member to
see what properties, methods, type of object etc exist on an item. Its
helped me a lot.

PoSh [31] =BB [System.Net.DNS]::Resolve("computer") | Get-Member


TypeName: System.Net.IPHostEntry

Name            MemberType Definition
----            ---------- ----------
Equals          Method     System.Boolean Equals(Object obj)
GetHashCode     Method     System.Int32 GetHashCode()
GetType         Method     System.Type GetType()
get_AddressList Method     System.Net.IPAddress[] get_AddressList()
get_Aliases     Method     System.String[] get_Aliases()
get_HostName    Method     System.String get_HostName()
set_AddressList Method     System.Void set_AddressList(IPAddress[]
value)
set_Aliases     Method     System.Void set_Aliases(String[] value)
set_HostName    Method     System.Void set_HostName(String value)
ToString        Method     System.String ToString()
AddressList     Property   System.Net.IPAddress[] AddressList
{get;set;}
Aliases         Property   System.String[] Aliases {get;set;}
HostName        Property   System.String HostName {get;set;}