These functions allows you to create generic objects of different types (Lists and Dictionaries) and to read the Restriction-code and Error-code of SoapExceptions.
For more details about the usage please read this post: http://blog.coolorange.com/2013/01/25/updatefileproperties-from-vault-api-in-powershell

How to use it:

creating and filling the list

$list = New-List string
$list.Add("test string")

creating and filling the dictionary

$dic = New-Dictionary string int
$dic.Add("some Key",10)

reading the error code and restriction code from the soap-exception

try
{
$webservice.SomeFunction();
}Catch
{
$e=$.Exception.InnerException
$res=GetErrorAndRestrictionCodesString $e
if($res[1] -ne $null)
{
LogFile "Webservice call is restricted! Error:$ StackTrace:..." "ERROR"
LogFile "Code: $($res[0]) | RestricionCode: $($res[1])" "ERROR"
}
}else
{
LogFile "Webservice failed with error:$_ StackTrace:..." "ERROR"
}
}

#function for creating generic lists and dictionaries
function New-List([type] $type)
{
  $base = [System.Collections.Generic.List``1]
  $qt = $base.MakeGenericType(@($type))
  New-Object $qt
}
function New-Dictionary([type] $keyType, [type]$valueType){  
    $base = [System.Collections.Generic.Dictionary``2]
    $ct = $base.MakeGenericType(($keyType, $valueType))
    New-Object $ct
}

#function for reading the restriction code of soap-exceptions
function GetErrorAndRestrictionCodesString($e) 
{
   $se = [System.Web.Services.Protocols.SoapException]$e 
    $errorCode = $null; 
    $restrictionCodes = ""; 
   $restrictionErrors = @( "1092", "1387", "1633" );       

    if ($se -ne $null) 
    { 
        try 
        { 
            $errorCode = $se.Detail["sl:sldetail"]["sl:errorcode"].InnerText.Trim(); 

            if ($restrictionErrors -contains $errorCode) 
            { 
                $nodes = $se.Detail["sl:sldetail"]["sl:restrictions"].ChildNodes; 

                foreach ($node in $nodes) 
                {
                    if ($node.Name -eq "sl:restriction") 
                    { 
                        $element = [System.Xml.XmlElement] $node; 
                        if ($element -ne $null)
                        {
                            $restrictionCodes = $element.GetAttribute("sl:code");
                        }
                    } 
                } 
            } 
        } 
        catch 
        { } 
    }
    return @($errorCode,$restrictionCodes)
}