Enable/Disable JIT optimizations for assemblies so they can be debugged with dnSpy

IISAssemblyDebugging.psm1

Set-StrictMode -Version Latest
$ErrorActionPreference = "Stop"

function Enable-IISAssemblyDebugging
{
    param(
        [string]$Path = ".",
        [string]$Filter = "*.dll"
    )

    $Path = Resolve-Path $Path

    $binPath = Join-Path $Path "bin"
    $webConfig = Join-Path $Path "Web.config"

    if (-not (Test-Path $binPath)) {
        throw "Path does not contain a bin\ folder"
    }

    if (-not (Test-Path $webConfig)) {
        throw "Path does not contain a Web.config file"
    }

    $assemblies = Get-ChildItem -Path $binPath -Filter $Filter -File

    $assemblies | Foreach-Object {
        $assemblyIniPath = Join-Path $_.DirectoryName "$($_.BaseName).ini"

        Set-Content -Path $assemblyIniPath -Value "[.NET Framework Debugging Control]
GenerateTrackingInfo=1
AllowOptimize=0"
    } | Out-Null

    

    $doc = New-Object System.Xml.XmlDocument
    $doc.Load([string]$webConfig)

    $hostingEnvironmentEl = $doc.SelectSingleNode("/configuration/system.web/hostingEnvironment")

    if ($hostingEnvironmentEl -eq $null) {

        $hostingEnvironmentEl = $doc.CreateElement("hostingEnvironment")

        $systemWebEl = $doc.SelectSingleNode("/configuration/system.web")

        if ($systemWebEl -eq $null) {
            $systemWebEl = $doc.CreateElement("system.web")
            $doc.DocumentElement.AppendChild($systemWebEl)
        }

        $systemWebEl.AppendChild($hostingEnvironmentEl) | Out-Null
    }

    $hostingEnvironmentEl.SetAttribute("shadowCopyBinAssemblies", "false")

    $doc.Save($webConfig)
}

function Disable-IISAssemblyDebugging
{
    param(
        [string]$Path = ".",
        [string]$Filter = "*.dll"
    )

    $Path = Resolve-Path $Path

    $binPath = Join-Path $Path "bin"
    $webConfig = Join-Path $Path "Web.config"

    if (-not (Test-Path $binPath)) {
        throw "Path does not contain a bin\ folder"
    }

    if (-not (Test-Path $webConfig)) {
        throw "Path does not contain a Web.config file"
    }

    $assemblies = Get-ChildItem -Path $binPath -Filter $Filter -File

    $assemblies | 
        Foreach-Object { Join-Path $_.DirectoryName "$($_.BaseName).ini" } |
        Where-Object { Test-Path $_ } |
        ForEach-Object { Remove-Item $_ } |
        Out-Null

    $doc = New-Object System.Xml.XmlDocument
    $doc.Load([string]$webConfig)

    $hostingEnvironmentEl = $doc.SelectSingleNode("/configuration/system.web/hostingEnvironment")

    if ($hostingEnvironmentEl -ne $null) {
        $hostingEnvironmentEl.RemoveAttribute("shadowCopyBinAssemblies")

        if ($hostingEnvironmentEl.Attributes.Count -eq 0) {
            $hostingEnvironmentEl.ParentNode.RemoveChild($hostingEnvironmentEl) | Out-Null
        }
    }

    $doc.Save($webConfig)
}

Export-ModuleMember Disable-IISAssemblyDebugging
Export-ModuleMember Enable-IISAssemblyDebugging