IsolatedStorageException in Ms Word Addin

Question

I created a Word add-in project with a ribbon, and when I want to save the document, after several modifications with OpenXml, an exception is raised.

Dim MainXMLDoc As New XmlDocument()
Using WordDoc As WordprocessingDocument = WordprocessingDocument.Open(DocPath, True)

Dim mainPart As MainDocumentPart = WordDoc.MainDocumentPart
If Not mainPart Is Nothing Then

    MainXMLDoc.Load(mainPart.GetStream())
    EXmlDocument.XMLDoc = Nothing
    EXmlDocument.XMLDoc = MainXMLDoc
    EXmlDocument.GetWordDocIds()
    '..............
end if

'........
Dim stream As IO.Stream
stream = mainPart.GetStream(FileMode.Create, FileAccess.Write)

    MainXMLDoc.Save(stream) '-----> exception

And the exception message is:

Interception de System.IO.IsolatedStorage.IsolatedStorageException  
Message=Unable to determine the identity of domain.   Source=mscorlib 
StackTrace:
       at System.IO.IsolatedStorage.IsolatedStorage._GetAccountingInfo(Evidence
evidence, Type evidenceType, IsolatedStorageScope fAssmDomApp, Object&
oNormalized)
       at System.IO.IsolatedStorage.IsolatedStorage.GetAccountingInfo(Evidence
evidence, Type evidenceType, IsolatedStorageScope fAssmDomApp, String&
typeName, String& instanceName)
       at System.IO.IsolatedStorage.IsolatedStorage._InitStore(IsolatedStorageScope
scope, Evidence domainEv, Type domainEvidenceType, Evidence assemEv,
Type assemblyEvidenceType, Evidence appEv, Type appEvidenceType)
       at System.IO.IsolatedStorage.IsolatedStorage.InitStore(IsolatedStorageScope
scope, Type domainEvidenceType, Type assemblyEvidenceType)
       at System.IO.IsolatedStorage.IsolatedStorageFile.GetStore(IsolatedStorageScope
scope, Type domainEvidenceType, Type assemblyEvidenceType)
       at MS.Internal.IO.Packaging.PackagingUtilities.ReliableIsolatedStorageFileFolder.GetCurrentStore()
       at MS.Internal.IO.Packaging.PackagingUtilities.ReliableIsolatedStorageFileFolder..ctor()
       at MS.Internal.IO.Packaging.PackagingUtilities.GetDefaultIsolatedStorageFile()
       at MS.Internal.IO.Packaging.PackagingUtilities.CreateUserScopedIsolatedStorageFileStreamWithRandomName(Int32
retryCount, String& fileName)
       at MS.Internal.IO.Packaging.SparseMemoryStream.SwitchModeIfNecessary()
       at MS.Internal.IO.Packaging.SparseMemoryStream.Write(Byte[] buffer, Int32 offset, Int32 count)
       at MS.Internal.IO.Packaging.CompressEmulationStream.Write(Byte[] buffer,
Int32 offset, Int32 count)
       at MS.Internal.IO.Packaging.CompressStream.Write(Byte[] buffer, Int32 offset, Int32 count)
       at MS.Internal.IO.Zip.ProgressiveCrcCalculatingStream.Write(Byte[]
buffer, Int32 offset, Int32 count)
       at MS.Internal.IO.Zip.ZipIOModeEnforcingStream.Write(Byte[] buffer, Int32 offset, Int32 count)
       at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder)
       at System.IO.StreamWriter.Write(Char value)
       at System.Xml.XmlTextWriter.Indent(Boolean beforeEndElement)
       at System.Xml.XmlTextWriter.AutoComplete(Token token)
       at System.Xml.XmlTextWriter.WriteStartElement(String prefix, String localName, String ns)
       at System.Xml.XmlDOMTextWriter.WriteStartElement(String prefix, String localName, String ns)
       at System.Xml.XmlElement.WriteStartElement(XmlWriter w)
       at System.Xml.XmlElement.WriteElementTo(XmlWriter writer, XmlElement e)
       at System.Xml.XmlElement.WriteTo(XmlWriter w)
       at System.Xml.XmlDocument.WriteContentTo(XmlWriter xw)
       at System.Xml.XmlDocument.WriteTo(XmlWriter w)
       at System.Xml.XmlDocument.Save(Stream outStream)   InnerException:

This problem appears when the document size is larger than 1 MB. After several searches, the 'save' action is made with an isolated storage, and the solutions is :

• Install with Clickonce
• Create new domain
• Modify registry.

But for this project, I can't use ClickOnce and I can't modify the registry.

So I made changes to my source code, to create a new domain.

Imports DocumentFormat.OpenXml.Packaging
Imports System.IO

<Serializable()> Public Class ToIsolatedPackageSave
    Public Sub Save(ByRef mainPart As MainDocumentPart, ByRef xmlDocument As Xml.XmlDocument)
        Dim stream As IO.Stream
        stream = mainPart.GetStream(FileMode.Create, FileAccess.Write)
        xmlDocument.Save(stream) -----> same exception

    End Sub
End Class

And

Dim stream As Stream
Dim isolatedPackageSave As ToIsolatedPackageSave
Dim isolatedAppDomain As AppDomain

Try
    Dim isolatedAppDomainSetup As AppDomainSetup = New AppDomainSetup()
    isolatedAppDomainSetup.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory

    Dim isolatedEvidence As Evidence = New Evidence(AppDomain.CurrentDomain.Evidence)
    isolatedEvidence.AddAssembly(Reflection.Assembly.GetExecutingAssembly().FullName)
    isolatedEvidence.AddHost(New Zone(Security.SecurityZone.MyComputer))

    isolatedAppDomain = AppDomain.CreateDomain("TrustIsolatedDomain", isolatedEvidence, isolatedAppDomainSetup)
    isolatedPackageSave = isolatedAppDomain.CreateInstanceAndUnwrap(GetType(ToIsolatedPackageSave).Assembly.FullName, GetType(ToIsolatedPackageSave).FullName)
    '(IsolatedPackageSave)isolatedAppDomainSetup.CreateInstanceAndUnwrap(GetType(ToIsolatedPackageSave).Assembly.FullName, GetType(ToIsolatedPackageSave).FullName)
    isolatedPackageSave.Save(mainPart, MainXMLDoc)
Catch ex As Exception
Finally
    AppDomain.Unload(isolatedAppDomain)
End Try

But this code doesn't fix my problem.

Orchitis

Answer 1

I followed Tim Lewis' advice in this post to inject the needed security evidence: http://rekiwi.blogspot.com/2008/12/unable-to-determine-identity-of-domain.html

public void VerifySecurityEvidenceForIsolatedStorage(Assembly assembly)
{
    var isEvidenceFound = true;
    var initialAppDomainEvidence = System.Threading.Thread.GetDomain().Evidence;
    try
    {
        // this will fail when the current AppDomain Evidence is instantiated via COM or in PowerShell
        using (var usfdAttempt1 = System.IO.IsolatedStorage.IsolatedStorageFile.GetUserStoreForDomain())
        {
        }
    }
    catch (System.IO.IsolatedStorage.IsolatedStorageException e)
    {
        isEvidenceFound = false;
    }

    if (!isEvidenceFound)
    {
        initialAppDomainEvidence.AddHostEvidence(new Url(assembly.Location));
        initialAppDomainEvidence.AddHostEvidence(new Zone(SecurityZone.MyComputer));

        var currentAppDomain = Thread.GetDomain();
        var securityIdentityField = currentAppDomain.GetType().GetField("_SecurityIdentity", BindingFlags.Instance | BindingFlags.NonPublic);
        securityIdentityField.SetValue(currentAppDomain, initialAppDomainEvidence);

        var latestAppDomainEvidence = System.Threading.Thread.GetDomain().Evidence; // setting a breakpoint here will let you inspect the current app domain evidence
    }
}

Then call the following code at startup:

VerifySecurityEvidenceForIsolatedStorage(this.GetType().Assembly);

Raine

Since IsolatedStorageFile implements IDisposable, I'd suggest using (var usfdAttempt1 = IsolatedStorageFile.GetUserStoreForDomain()) {} instead. – Callous

I agree with your suggestion @Heinzi. I've updated the above code snippet. – Raine

Answer 2

I think, you can't use OpenXML inside office addins. If you want to use OpenXML, u have to do it offline (when document is not opened). You can only use COM interops (office object Model calls) from inside addins.

Intercalation

Hi Kris, when we use OpenXml, Ms Word is still active but the document is closed. – Orchitis

Did you try after killing /closing the MSWord executable? – Intercalation

Hi Kris, No I can't do this, because if I kill MsWord, I stop the process. The project is an Addin Word and it runs into MsWord. – Orchitis