Hi List,
I am encountering interesting security problems with my VB.NET application.
I have an MDI form that instantiates a utility object for things like
program load, message passing, etc. The MDI form uses
System.Reflection.Assembly.LoadFrom() to dynamically load an assembly off a
server. This is connected to the utility object and calls various methods
on it. I get an error thrown when the loaded assembly calls a method on the
utility object that reads the registry (i.e. does a GetSettings). Here's
the error's .ToString:
"System.Security.SecurityException: Request for the permission of type
System.Security.Permissions.RegistryPermission, mscorlib,
Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
failed.
at System.Security.CodeAccessSecurityEngine.CheckHelper(PermissionSet
grantedSet, PermissionSet deniedSet, CodeAccessPermission demand,
PermissionToken permToken)
at System.Security.CodeAccessSecurityEngine.Check(PermissionToken
permToken, CodeAccessPermission demand, StackCrawlMark& stackMark, Int32
checkFrames, Int32 unrestrictedOverride)
at System.Security.CodeAccessSecurityEngine.Check(CodeAccessPermission
cap, StackCrawlMark& stackMark)
at System.Security.CodeAccessPermission.Demand()
at Microsoft.Win32.RegistryKey.OpenSubKey(String name, Boolean writable)
at Microsoft.Win32.RegistryKey.OpenSubKey(String name)
at Microsoft.VisualBasic.Interaction.GetSetting(String AppName, String
Section, String Key, String Default)
at SCAT.SCATComm.MRUListGet(String ListName) in
C:\VBDotNet\SCATComm\SCATComm.vb:line 626"
The bottom line (SCAT.SCATComm.MRUListGet) is my method to get the registry
setting. The line of code that throws the exception is:
ListSetting = GetSetting("SCAT", "MRU", ListName)
ListSetting is a string.
The code works when I do a project reference to the assembly in question,
but fails when it is dynamically loaded.
Any ideas on how to make it work?
Regards,
Jay Ayliff
Stalis Ltd
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