VSTO SE Outlook Addin System.IO Failed to grant permission to exec

[nickname]

I have written an Outlook addin that works fine, I have given signed the
assembly and given it full trust via CasPol. I have some code that accesses a
file:

using (StreamReader sr = new StreamReader(fileName))
{
String line;
while ((line = sr.ReadLine()) != null)
{
...
}
}

If i comment this code out it works fine, but with the code in i get a
exception "Failed to grant permission to execute", I am not sure whty i get
this as i have given it full trust. Can anybody explain?

Thanks

 

[Ken Slovak - [MVP - Outlook]]

Could the file path be restricted to the user? What if the file were in a
known available area such as LocalAppData\Temp?

 

[nickname]

The path is within the user's profile directory so they have full control.
Don't think its that, in anycase I have a try catch block around the IO stuff.

 

[Ken Slovak - [MVP - Outlook]]

No idea then. I've used a filereader and a streamreader with no such
problems.

 

[Jialiang Ge [MSFT]]

Hello,

From your post, my understanding on this issue is: you wonder why the
outlook add-in reports the exception "Failed to grant permission to
execute" even if the assembly has been granted the full trust. If I'm off
base, please feel free to let me know.

I find a very similar question posted in MSDN forum:
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=298353&SiteID=1. The
owner of that post also granted the full trust to the Office add-in
assembly, but because Office does not recognize the new security settings
until all of the programs of Office have been shut down and restarted, his
assembly still throw the exception "Failed to grant permission to execute".
As Harry Miller suggested in that post, if the administrator adjusts
permissions for a document or assembly, users must quit and then restart
all Office applications for those changes to be enforced due to Security
Policy Cacheing. Other application that host Microsoft Office can also
prevent the new permissions from being enforced. Users should quit all the
applications that use Office, hosted or standalone, when security policies
are changed. You may try the suggestion to see if it fits your situation.

Security and Permission issues of Office development could be referred by:
http://msdn2.microsoft.com/en-us/library/k64zb6we(VS.80).aspx

Please let me know if you have any other concerns, or need anything else.

Sincerely,
Jialiang Ge ([email protected], remove 'online.')
Microsoft Online Community Support

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[Jialiang Ge [MSFT]]

Hello,

Would you mind letting me know the result of the suggestions? If you need
further assistance, feel free to let me know. I will be more than happy to
be of assistance.

Have a great day!

Sincerely,
Jialiang Ge ([email protected], remove 'online.')
Microsoft Online Community Support

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