biz.dfch.PS.System.Utilities

2.2.0.20160723

Invoke-GenericMethod.ps1

                                function Invoke-GenericMethod {

<#

.SYNOPSIS

Invokes a generic method and returns its value.

.DESCRIPTION

Invokes a generic method and returns its value.

The method will be looked up via reflection and converted to a typed 

non-generic method.

The return value of the method will be returned to the caller.

Note: the Cmdlet currently does not support resolving method names with 

overloads.

.INPUTS

You must specify a class instance of an object with a generic method, the 

generic method name along with its type and optionally a number of parameters 

to be passed to the method.

.OUTPUTS

The Cmdlet returns the return value of the generic method to be invoked.

.EXAMPLE

# Invoke the "biz.dfch.PS.Testing.TestGenericMethod.Create" method with 

# type [TestGenericMethod]. C# definition would then look similar to this: 

# public TestGenericMethod Create<TestGenericMethod>() { /* ... */ }

PS > $object = New-Object biz.dfch.PS.Testing.TestGenericMethod;

PS > $result = Invoke-GenericMethod -InputObject $object -Name "Create" -Type $object.GetType() -Parameters $null;

PS > # same as : $result = Invoke-GenericMethod -InputObject $object -Name "Create";

PS > $result.GetType()

IsPublic IsSerial Name          BaseType

-------- -------- ----          --------

True     False    GenericMethod GenericMethodBase

.LINK

Online Version: http://dfch.biz/biz/dfch/PS/System/Utilities/Invoke-GenericMethod/

.NOTES

See module manifest for required software versions and dependencies at: 

http://dfch.biz/biz/dfch/PS/System/Utilities/biz.dfch.PS.System.Utilities.psd1/

#>

[CmdletBinding(

    SupportsShouldProcess = $true

    ,

    ConfirmImpact = 'Low'

    ,

    HelpURI = 'http://dfch.biz/biz/dfch/PS/System/Utilities/Invoke-GenericMethod/'

)]

PARAM (

    # Class instance on which to invoke the generic method

    [Parameter(Mandatory = $true, Position = 0)]

    [object] $InputObject

    ,

    # Name of non-generic method to invoke

    [ValidateNotNullOrEmpty()]

    [Parameter(Mandatory = $true, Position = 1)]

    [string] $Name

    ,

    # The type of the non-generic method to invoke

    # Defaults to the type of the class instance

    [Parameter(Mandatory = $false)]

    [Type] $Type = $InputObject.GetType()

    ,

    # The type of the non-generic method to invoke

    [Parameter(Mandatory = $false)]

    [object[]] $Parameters

)

BEGIN

{

    # Default test variable for checking function response codes.

    [Boolean] $fReturn = $false;

    # Return values are always and only returned via OutputParameter.

    $OutputParameter = $null;

    $datBegin = [datetime]::Now;

    [string] $fn = $MyInvocation.MyCommand.Name;

    # Log-Debug $fn ("CALL.");

}

PROCESS

{

    trap { Log-Exception $_; break; }

    $instanceType = $InputObject.GetType();

    $nonGenericMethod = $instanceType.GetMethod($Name);

    Contract-Assert (!!$nonGenericMethod)

    $genericMethod = $nonGenericMethod.MakeGenericMethod($Type);

    Contract-Assert (!!$genericMethod)

    $count = 0;

    $parametersList = ""

    foreach($p in $Parameters) 

    { 

        $parametersList += "p{0}, " -f $count;

        $count++;

    }

    $parametersList = $parametersList.TrimEnd(", ")

    if($PSCmdlet.ShouldProcess(("{0}.{1}[{2}]({3})" -f $InputObject.GetType().FullName, $Name, $Type.FullName, $parametersList)))

    {

        $result = $genericMethod.Invoke($InputObject, $Parameters);

    }

}

END

{

    # $datEnd = [datetime]::Now;

    # Log-Debug -fn $fn -msg ("RET. fReturn: [{0}]. Execution time: [{1}]ms. Started: [{2}]." -f $fReturn, ($datEnd - $datBegin).TotalMilliseconds, $datBegin.ToString('yyyy-MM-dd HH:mm:ss.fffzzz')) -fac 2;

    $OutputParameter = $result;

    return $OutputParameter;

}

} # function

if($MyInvocation.ScriptName) { Export-ModuleMember -Function Invoke-GenericMethod; } 

#

# Copyright 2015-2016 d-fens GmbH

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

#

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# SIG # End signature block