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& oNormalize…

Accepted Answer

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);
```

IsolatedStorageException in Ms Word Addin

Solution

Problem