IsolatedStorageException in Ms Word Addin - vb.net

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.

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);

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.