I'm writing a PowerShell module, in PowerShell, which has to redirect an assembly binding.
I had no problems using a bindingRedirect in powershell_ise.exe.config but I don't think this is acceptable for a module I want to distribute, so I looked for other ways and came across AppDomain.CurrentDomain.AssemblyResolve.
I'm currently using this at the top of my .psm1 file:
function Resolve-AssemblyRedirect {
PARAM ([object]$sender, [System.ResolveEventArgs]$e)
PROCESS {
$requestedName = New-Object System.Reflection.AssemblyName $e.Name
if ($requestedName.Name -eq "System.Net.Http.Primitives") {
return [System.Reflection.Assembly]::LoadFrom("$PSScriptRoot\Assemblies\System.Net.Http.Primitives.dll")
}
return $null
}
}
if (-not $Global:MODULE_LOADED) {
[AppDomain]::CurrentDomain.add_AssemblyResolve( { Resolve-AssemblyRedirect $Args[0] $Args[1] } )
Set-Variable -Option Constant -Name MODULE_LOADED -Value $true -Scope Global
}
I can trigger the problem fairly reliably by using tab-completion/Intellisense in the ISE. I have also seen it in the shell. When I say fairly reliably, it's not always the same cmdlet that triggers it. For example, in preparing this, I've triggered it with Get-ADUser [tab] and most recently, I typed get-por [tab], Intellisense displayed Get-GPOReport and then it hung.
If I comment-out the line beginning [AppDomain]::, and hammer tab-completion, I don't see a problem.
Before I go on, I want to point out that I've never had to debug anything in PowerShell, before, so there's been quite a bit of fumbling in the dark. In order to debug, I added a REG_SZ to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AeDebug with the name Auto and the value 1, which is giving me the option to start VS 2012. That is then showing me:
System.StackOverflowException was unhandled
and when I look at the Call Stack I see:
mscorlib.dll!System.Resources.ResourceManager.GetString(string name, System.Globalization.CultureInfo culture) + 0x23c bytes
System.Management.Automation.dll!System.Management.Automation.ErrorCategoryInfo.Ellipsize(System.Globalization.CultureInfo uiCultureInfo, string original) + 0x88 bytes
System.Management.Automation.dll!System.Management.Automation.ScriptBlock.InvokeAsDelegateHelper(object dollarUnder, object dollarThis, object[] args) + 0x137 bytes
[Lightweight Function]
mscorlib.dll!System.AppDomain.OnAssemblyResolveEvent(System.Reflection.RuntimeAssembly assembly, string assemblyFullName) + 0xbc bytes
[Native to Managed Transition]
[Managed to Native Transition]
mscorlib.dll!System.Reflection.RuntimeAssembly.InternalGetSatelliteAssembly(string name, System.Globalization.CultureInfo culture, System.Version version, bool throwOnFileNotFound, ref System.Threading.StackCrawlMark stackMark) + 0x3ab bytes
mscorlib.dll!System.Resources.ManifestBasedResourceGroveler.GetSatelliteAssembly(System.Globalization.CultureInfo lookForCulture, ref System.Threading.StackCrawlMark stackMark) + 0xdd bytes
mscorlib.dll!System.Resources.ManifestBasedResourceGroveler.GrovelForResourceSet(System.Globalization.CultureInfo culture, System.Collections.Generic.Dictionary<string,System.Resources.ResourceSet> localResourceSets, bool tryParents, bool createIfNotExists, ref System.Threading.StackCrawlMark stackMark) + 0xe2 bytes
mscorlib.dll!System.Resources.ResourceManager.InternalGetResourceSet(System.Globalization.CultureInfo requestedCulture, bool createIfNotExists, bool tryParents, ref System.Threading.StackCrawlMark stackMark) + 0x329 bytes
mscorlib.dll!System.Resources.ResourceManager.InternalGetResourceSet(System.Globalization.CultureInfo culture, bool createIfNotExists, bool tryParents) + 0x23 bytes
mscorlib.dll!System.Resources.ResourceManager.GetString(string name, System.Globalization.CultureInfo culture) + 0x23c bytes
Microsoft.PowerShell.Editor.dll!Microsoft.VisualStudio.Language.Intellisense.Implementation.CompletionSession.Commit() + 0x285 bytes
Microsoft.PowerShell.GPowerShell.dll!Microsoft.PowerShell.Host.ISE.PowerShellTab.TabComplete(Microsoft.PowerShell.Host.ISE.ISEEditor editor, bool forward) + 0x51c bytes
Microsoft.PowerShell.GPowerShell.dll!Microsoft.PowerShell.Host.ISE.PowerShellTab.ProcessTab(object sender, System.Windows.Input.KeyEventArgs e, Microsoft.PowerShell.Host.ISE.PowerShellTab selectedPowerShellTab) + 0x167 bytes
Microsoft.PowerShell.GPowerShell.dll!Microsoft.Windows.PowerShell.Gui.Internal.BeforeDefaultKeyProcessor.KeyDown(System.Windows.Input.KeyEventArgs args) + 0x4a bytes
Microsoft.PowerShell.Editor.dll!Microsoft.VisualStudio.Text.Utilities.GuardedOperations.CallExtensionPoint(object errorSource, System.Action call) + 0x26 bytes
Microsoft.PowerShell.Editor.dll!Microsoft.VisualStudio.Text.Editor.Implementation.KeyProcessorDispatcher.Dispatch<System.Windows.Input.KeyEventArgs>(System.Action<Microsoft.VisualStudio.Text.Editor.KeyProcessor,System.Windows.Input.KeyEventArgs> action, System.Windows.Input.KeyEventArgs args) + 0x185 bytes
PresentationCore.dll!System.Windows.RoutedEventArgs.InvokeHandler(System.Delegate handler, object target) + 0x56 bytes
PresentationCore.dll!System.Windows.EventRoute.InvokeHandlersImpl(object source, System.Windows.RoutedEventArgs args, bool reRaised) + 0x270 bytes
PresentationCore.dll!System.Windows.UIElement.RaiseEventImpl(System.Windows.DependencyObject sender, System.Windows.RoutedEventArgs args) + 0x14e bytes
PresentationCore.dll!System.Windows.UIElement.RaiseTrustedEvent(System.Windows.RoutedEventArgs args) + 0x64 bytes
PresentationCore.dll!System.Windows.Input.InputManager.ProcessStagingArea() + 0x431 bytes
PresentationCore.dll!System.Windows.Input.InputManager.ProcessInput(System.Windows.Input.InputEventArgs input) + 0xab bytes
PresentationCore.dll!System.Windows.Interop.HwndKeyboardInputProvider.ReportInput(System.IntPtr hwnd, System.Windows.Input.InputMode mode, int timestamp, System.Windows.Input.RawKeyboardActions actions, int scanCode, bool isExtendedKey, bool isSystemKey, int virtualKey) + 0x124 bytes
PresentationCore.dll!System.Windows.Interop.HwndKeyboardInputProvider.ProcessKeyAction(ref System.Windows.Interop.MSG msg, ref bool handled) + 0x20e bytes
PresentationCore.dll!System.Windows.Interop.HwndSource.CriticalTranslateAccelerator(ref System.Windows.Interop.MSG msg, System.Windows.Input.ModifierKeys modifiers) + 0x213 bytes
PresentationCore.dll!System.Windows.Interop.HwndSource.OnPreprocessMessage(object param) + 0x35e bytes
WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate callback, object args, int numArgs) + 0x5e bytes
WindowsBase.dll!MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(object source, System.Delegate method, object args, int numArgs, System.Delegate catchHandler) + 0x47 bytes
WindowsBase.dll!System.Windows.Threading.Dispatcher.LegacyInvokeImpl(System.Windows.Threading.DispatcherPriority priority, System.TimeSpan timeout, System.Delegate method, object args, int numArgs) + 0x2bc bytes
WindowsBase.dll!System.Windows.Threading.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority priority, System.Delegate method, object arg) + 0x42 bytes
PresentationCore.dll!System.Windows.Interop.HwndSource.OnPreprocessMessageThunk(ref System.Windows.Interop.MSG msg, ref bool handled) + 0x107 bytes
WindowsBase.dll!System.Windows.Interop.ComponentDispatcherThread.RaiseThreadMessage(ref System.Windows.Interop.MSG msg) + 0x4f bytes
WindowsBase.dll!System.Windows.Threading.Dispatcher.TranslateAndDispatchMessage(ref System.Windows.Interop.MSG msg) + 0x2c bytes
WindowsBase.dll!System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame frame) + 0x112 bytes
PresentationFramework.dll!System.Windows.Application.RunInternal(System.Windows.Window window) + 0x17a bytes
Microsoft.PowerShell.GPowerShell.dll!Microsoft.Windows.PowerShell.Gui.Internal.Program.ShowMainWindow(System.Collections.Generic.List<string> filesToOpen, bool mta, bool noProfile, System.Threading.SendOrPostCallback loadedCallback) + 0x1a5 bytes
[Native to Managed Transition]
PowerShell_ISE.exe!Microsoft.Windows.PowerShell.GuiExe.Internal.GPowerShell.Main(string[] args) + 0x4d0 bytes
I've only included one repeat of the section between the lines:
mscorlib.dll!System.Resources.ResourceManager.GetString(string name, System.Globalization.CultureInfo culture) + 0x23c bytes
but that repeats a lot.
I've put this through the washer a few times and I don't always see the same results in the Call Stack. For example, sometimes the repeating part looks like this:
mscorlib.dll!System.Resources.ResourceManager.GetString(string name, System.Globalization.CultureInfo culture) + 0x23c bytes
System.Management.Automation.dll!System.Management.Automation.ErrorCategoryInfo.Ellipsize(System.Globalization.CultureInfo uiCultureInfo, string original) + 0x88 bytes
System.Management.Automation.dll!System.Management.Automation.ScriptBlock.InvokeAsDelegateHelper(object dollarUnder, object dollarThis, object[] args) + 0x137 bytes
[Lightweight Function]
mscorlib.dll!System.AppDomain.OnAssemblyResolveEvent(System.Reflection.RuntimeAssembly assembly, string assemblyFullName) + 0xbc bytes
[Native to Managed Transition]
[Managed to Native Transition]
mscorlib.dll!System.Reflection.RuntimeAssembly.InternalGetSatelliteAssembly(string name, System.Globalization.CultureInfo culture, System.Version version, bool throwOnFileNotFound, ref System.Threading.StackCrawlMark stackMark) + 0x3ab bytes
mscorlib.dll!System.Resources.ManifestBasedResourceGroveler.GetSatelliteAssembly(System.Globalization.CultureInfo lookForCulture, ref System.Threading.StackCrawlMark stackMark) + 0xdd bytes
mscorlib.dll!System.Resources.ManifestBasedResourceGroveler.GrovelForResourceSet(System.Globalization.CultureInfo culture, System.Collections.Generic.Dictionary<string,System.Resources.ResourceSet> localResourceSets, bool tryParents, bool createIfNotExists, ref System.Threading.StackCrawlMark stackMark) + 0xe2 bytes
mscorlib.dll!System.Resources.ResourceManager.InternalGetResourceSet(System.Globalization.CultureInfo requestedCulture, bool createIfNotExists, bool tryParents, ref System.Threading.StackCrawlMark stackMark) + 0x329 bytes
mscorlib.dll!System.Resources.ResourceManager.InternalGetResourceSet(System.Globalization.CultureInfo culture, bool createIfNotExists, bool tryParents) + 0x23 bytes
mscorlib.dll!System.Resources.ResourceManager.GetString(string name, System.Globalization.CultureInfo culture) + 0x23c bytes
while the initial part before the repeat starts is often different.
From a bit of reading, it seems that LightweightFunction is probably my function Resolve-AssemblyRedirect.
Am I doing something wrong?
Without digging into the AppDomain assembly resolution stuff, I can tell that you that most likely there is a non-terminating loop in the code path represented by the repeating lines in the stack walk. Each time the code goes through the loop it eats up more stack until all the stack's been used and you get the exception with the same name as this web site.
My guess is that the change you made to the .config file causes .NET to behave badly.
Using reflector I can see the infinite loop. InvokeAsDelegateHelper calls GetContextFromTLS. GetContextFromTLS calls GetExecutionContextFromTLS. GetExecutionContextFromTLS returns null if the DefaultRunspace is null. When GetContextFromTLS gets a null back from GetExecutionContextFromTLS (among other things) it calls ErrorCategory.Ellipsize. Ellipsize reads the property ErrorPackage.Ellipsize. The ErrorPackage.Ellipsize accessor method calls ResourceManager.GetString, which restarts the loop
So it looks like the bad behavior comes from having a null DefaultRunspace. I'm not sure how that would happen if you are just using Powershell.exe to run your script. But if you are invoking Powershell from, say, C#, then you probably have a bug in your code that invokes Powershell. Either way it would probably be helpful to look on MSDN at the documentation regarding launching Powershell from a program.
HTH