Re: StrongNameIdentityPermission issue.

From: Hernan de Lahitte (hernan_at_lagash.com)
Date: 04/28/04

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    Check the assembly version number where your Forms resides. Version numbers
    must be the same on both the asembly and on the linkdemand declaration. Your
    exception shows a version number of "1.0.5000.0" and on your LinkDemand
    declaration is "1.0.0.0". 

    -- 
Hernan de Lahitte
Lagash Systems S.A.
http://weblogs.asp.net/hernandl
This posting is provided "AS IS" with no warranties, and confers no rights.
"David Riddiford" <anonymous@discussions.microsoft.com> wrote in message
news:1F50C7F9-5AB1-493E-A433-BA5B95EA82E5@microsoft.com...
> Hi,
>
> I am having another problem with StrongNameIdentityPermission. I'll go
through an example.
>
> I have two projects in a solution: MainApp and CallClass. MainApp is a
WinForm project containing a form called MainForm. CallClass is a class
library project containing a class called MyClass and a Form called
SecondForm. MyClass has a public static method called LogonSucceed which
simply returns a string.
>
> Both projects are strong named.
>
> Both classes in CallClass have the following strong name identity
permission demand:
> [StrongNameIdentityPermission(SecurityAction.LinkDemand,
PublicKey="<public key>", Name="MainApp", Version="1.0.0.0")]
>
> The load method of MainForm is as follows:
> private void MainForm_Load(object sender, System.EventArgs e)
> {
> try
> {
> MessageBox.Show(MyClass.LogonSucceed());
> Form secondForm = new SecondForm();
> secondForm.Owner = this;
> secondForm.Show();
> }
> catch (SecurityException ex)
> {
> MessageBox.Show("MyClass is unavailable. " + ex.Message);
> Application.Exit();
> }
> }
>
> When I run the app, the message box displays correctly, but when
SecondForm is instantiated, a security exception occurs as follows:
> Request for the permission of type
System.Security.Permissions.StrongNameIdentityPermission, mscorlib,
Version=1.0.5000.0, Culture=neutral, PublicKeyToken=<public key token>
failed.
>
> Exactly the same Link Demand is performed on both classes in the CallClass
project.  The call to a public static method works. Instantiating the form
fails. Note that I checked that instantiating MyClass actually worked. Also,
if I remove the name and version parameters to the strong name identity
permission, instantiating the form will work.
>
> So it appears that StrongNameIdentityPermission does not work on WinForm
classes if the name and version parameters are set, unless of course I am
doing something wrong :-)
>
> Does anyone have any ideas as to why this behaviour is occuring, and how I
can resolve this issue.
>
> Thanks,
> David.
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