$da = [System.AppDomain]::CurrentDomain.DefineDynamicAssembly((New-Object System.Reflection.AssemblyName(“dyn”)), [System.Reflection.Emit.AssemblyBuilderAccess]::Save)

$dm = $da.DefineDynamicModule(“dyn_mod”, “dyn.dll”)
$dt = $dm.DefineType(“dyn_type”)
$method = $dt.DefineMethod(“Foo”, [System.Reflection.MethodAttributes]::Public -bor [System.Reflection.MethodAttributes]::Static)

$tokens = $null
$parseErrors = $null
$ast = [System.Management.Automation.Language.Parser]::ParseInput(‘$a = 1 + 2′, [ref]$tokens, [ref]$parseErrors)

$compiledBlock = $ast.GetScriptBlock()

$SMA = [SYstem.Reflection.Assembly]::LoadWithPartialName(“System.Management.Automation”)
$CompiledScriptBlockType = $SMA.GetType(“System.Management.Automation.ScriptBlock”)
$CompiledScriptBlockDataType = $SMA.GetType(“System.Management.Automation.CompiledScriptBlockData”)
$BindingFlags = [System.Reflection.BindingFlags]::Instance -bor [System.Reflection.BindingFlags]::NonPublic

$CompiledScriptBlockType.GetMethod(“Compile”, $BindingFlags).Invoke($compiledBlock, @($true))
$blocktree = $CompiledScriptBlockType.GetProperty(“EndBlockTree”, $BindingFlags)
$lambda = $blocktree.GetValue($compiledBlock, @())

$lambda.CompileToMethod($method)
$dt.CreateType()
$da.Save(“dyn.dll”)