Trying to create a variable containing a lambda expression

powerlambda

# Trying to call ListByNameFiltered from
# http://www.orthogonal.com.au/computers/simpledb/index.htm

# (input parameters) => expression
# (id) => { return id == 1234; }

[System.Reflection.Assembly]::LoadWithPartialName("System.Linq.Expressions")

if ( [string]::IsNullOrEmpty([psobject].Assembly.GetType("System.Management.Automation.TypeAccelerators")::get["Expression"]) )
{
    [psobject].Assembly.GetType("System.Management.Automation.TypeAccelerators")::add("Expression", "System.Linq.Expressions.Expression")
}

[System.Linq.Expressions.ParameterExpression] $leftParam = [Expression]::Parameter([int], "id")
[System.Linq.Expressions.ConstantExpression] $rightParam = [Expression]::Constant(1234)
[System.Linq.Expressions.LabelTarget] $returnTarget = [Expression]::Label()

[System.Linq.Expressions.BinaryExpression] $equalExpression = [Expression]::Equal($leftParam, $rightParam)

# http://msdn.microsoft.com/en-us/library/dd402793(v=vs.110).aspx
[System.Linq.Expressions.GotoExpression] $returnEqual = [Expression]::Return($returnTarget, $equalExpression)

$expressionParams = [Linq.Expressions.ParameterExpression[]]@($leftParam, $rightParam)

$lambda = [Expression]::Lambda([func[int,int,int]], $returnEqual, $expressionParams)

<#
static System.Linq.Expressions.Expression[TDelegate] Lambda[TDelegate](System.Linq.Expressions.Expression body, Params System.Linq.Expressions.ParameterExpression[] parameters)     
static System.Linq.Expressions.LambdaExpression Lambda(type delegateType, System.Linq.Expressions.Expression body, Params System.Linq.Expressions.ParameterExpression[] parameters)    

# http://msdn.microsoft.com/en-us/library/bb397951.aspx
Expression<Func<int, bool>> $lambda1 =
    Expression.Lambda<Func<int, bool>>(
        returnEqual,
        new ParameterExpression[] { leftParam, rightParam });
#>