Re: AssemblyLoadFrom(URL) works only on some machines

There is a service pack that you may have downloaded from Windows Update for
..NET 1.1. It may be work using the Filemon tool from Sysinternals.com to see
if there are some external dependencies of empDll that are causing the
failure. Given that its a MC++ assembly there are a few places you could
squirrel away code to make things break.

--



Mitch Denny
email: mitch.denny@xxxxxxxxxxxxxx
mobile: +61 (414) 610-141
blog: http://notgartner.com
skype: callto://mitchdenny


"Chucker" <Chucker@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:09C2CA18-9F22-4986-B6BA-3C585699B3CD@xxxxxxxxxxxxxxxx
> Hi Folks,
>
> I got an Auto-Updating Application that is supposed to download all the
> assemblies needed from a deployment machine when started.
>
> Here ist the Code for the Launcher that has to be deployed to the Machine
> actually running the Code. All other Stuff should be downloaded upon
> execution time.
>
> using System;
> using System.Management;
> using System.Management.Instrumentation;
> using System.Runtime.Remoting;
> using System.Runtime.Remoting.Channels;
> using System.Runtime.Remoting.Channels.Tcp;
> using System.Runtime.Remoting.Channels.Http;
> using System.Runtime.Serialization.Formatters;
> using System.IO;
> using System.Security;
> using System.Security.Policy;
> using System.Security.Permissions;
> using System.Collections;
> using System.Reflection;
> using System.Windows.Forms;
> using System.Xml;
> using System.Net;
> using System.Diagnostics;
> using System.Threading;
>
> namespace Launcher
> {
> /// <summary>
> /// Summary description for Launcher.
> /// </summary>
> public class Launcher
> {
> public static string ConfigFile = "ServerConfig.xml";
> public static string AssemblyFile = "SharedAssembly.dll";
> public static string DeploymentServer = "http://servername/Deployment/";;
> public static string CodeGroup = "3DEM";
>
> public static Assembly AssemblyResolveEventHandler(System.Object sender,
> System.ResolveEventArgs e)
> {
> AppDomain domain = (AppDomain) sender;
>
> // e.Name gives the assembly display name that was requested
> int commaPos = e.Name.IndexOf(",", 0, e.Name.Length);
>
> String name = e.Name;
>
> if (commaPos > 0) name = e.Name.Substring(0, commaPos);
>
> if (name.EndsWith(".resources")) name = e.Name.Substring(0, name.Length -
> 10);
>
> Assembly foundAss = null;
>
> WebPermission perm = new WebPermission(NetworkAccess.Connect,
> DeploymentServer + name + ".dll");
> perm.Assert();
>
> String fileName = DeploymentServer + name + ".dll";
>
> foundAss = Assembly.LoadFrom(fileName);
>
> Console.WriteLine("AliGUI loaded Assembly: " + fileName);
>
> CodeAccessPermission.RevertAssert();
>
> return foundAss;
> }
>
> public Launcher()
> {
> //
> // TODO: Add constructor logic here
> //
> }
>
> [STAThread]
> static void Main()
> {
> try
> {
> AppDomain currentDomain = AppDomain.CurrentDomain;
>
> currentDomain.AssemblyResolve += new
> ResolveEventHandler(AssemblyResolveEventHandler);
>
> IEnumerator levels = System.Security.SecurityManager.PolicyHierarchy();
>
> while (levels.MoveNext())
> {
> PolicyLevel level = (PolicyLevel)levels.Current;
>
> CodeGroup group = level.RootCodeGroup;
>
> if (level.Label.ToString( ) == "Machine")
> {
> if (group.MembershipCondition.ToString( ) == "All code")
> {
> System.Security.PermissionSet permSetFulltrust =
> level.GetNamedPermissionSet("FullTrust");
>
> System.Security.Policy.UrlMembershipCondition
> objUrlMembershipCondition = new
> UrlMembershipCondition(DeploymentServer+"*");
>
> group.AddChild(new
> System.Security.Policy.UnionCodeGroup(objUrlMembershipCondition, new
> System.Security.Policy.PolicyStatement(permSetFulltrust)));
>
> System.Security.Policy.UnionCodeGroup UnionCodeGroupObject =
> new System.Security.Policy.UnionCodeGroup (objUrlMembershipCondition
> , new System.Security.Policy.PolicyStatement (permSetFulltrust));
>
> UnionCodeGroupObject.Name = CodeGroup;
> group.AddChild(UnionCodeGroupObject);
>
> System.Security.SecurityManager.SavePolicy( );
> }
> }
> }
>
> string codeBase = "http://servername/Deployment/";;
> Assembly uiAssembly = Assembly.LoadFrom(codeBase +
> "AliGUI.exe");
>
> Type type = uiAssembly.GetType("empGui.Form_Ali_Setup", true, false);
>
> Console.WriteLine("Assembly Name: " +
> type.AssemblyQualifiedName.ToString());
>
> Console.WriteLine("CodeBase: " + type.Assembly.CodeBase);
>
> System.Reflection.AssemblyName[] deps =
> type.Assembly.GetReferencedAssemblies();
>
> Console.WriteLine("Dependencies:");
>
> foreach(System.Reflection.AssemblyName dep in deps)
> {
> Console.WriteLine(dep.ToString());
> //Console.WriteLine(dep.CodeBase.ToString());
> }
>
> Application.Run((Form)Activator.CreateInstance(type));
>
> /*Console.WriteLine("Press any Key to exit");
>
> Console.ReadLine();*/
> }
> catch(Exception err)
> {
> MessageBox.Show(err.Message);
> }
> }
> }
> }
>
> This simply works for Windows XP machines where Visual Studio is
> installed.
> In this case, the output looks like this:
>
> Assembly Name: empGui.Form_Ali_Setup, AliGUI, Version=1.0.0.6,
> Culture=neutral,
> PublicKeyToken=null
> CodeBase: http://servername/Deployment/AliGUI.exe
> Dependencies:
> System.Web.Services, Version=1.0.5000.0, Culture=neutral,
> PublicKeyToken=b03f5f7
> f11d50a3a
> System.Windows.Forms, Version=1.0.5000.0, Culture=neutral,
> PublicKeyToken=b77a5c
> 561934e089
> mscorlib, Version=1.0.5000.0, Culture=neutral,
> PublicKeyToken=b77a5c561934e089
> System, Version=1.0.5000.0, Culture=neutral,
> PublicKeyToken=b77a5c561934e089
> System.Drawing, Version=1.0.5000.0, Culture=neutral,
> PublicKeyToken=b03f5f7f11d5
> 0a3a
> empDll, Version=1.1.0.0, Culture=neutral, PublicKeyToken=null
> ClientAssembly, Version=1.1.0.6, Culture=neutral, PublicKeyToken=null
> System.Xml, Version=1.0.5000.0, Culture=neutral,
> PublicKeyToken=b77a5c561934e089
>
> SharedAssembly, Version=1.1.0.6, Culture=neutral, PublicKeyToken=null
> AliGUI loaded Assembly: http://servername/Deployment/SharedAssembly.dll
> AliGUI loaded Assembly: http://servername/Deployment/SharedAssembly.dll
> AliGUI loaded Assembly: http://servername/Deployment/empDll.dll
> AliGUI loaded Assembly: http://servername/Deployment/SharedAssembly.dll
>
> As you can see here, an AssemblyResolve Event is fired and the Handler
> redirects to the Deployment URL, like it should be.
>
> On machines where Visual Studio ist not installed, I get the following
> output:
>
> Assembly Name: empGui.Form_Ali_Setup, AliGUI, Version=1.0.0.6,
> Culture=neutral,
> PublicKeyToken=null
> CodeBase: http://servername/Deployment/AliGUI.exe
> Dependencies:
> System.Web.Services, Version=1.0.5000.0, Culture=neutral,
> PublicKeyToken=b03f5f7
> f11d50a3a
> System.Windows.Forms, Version=1.0.5000.0, Culture=neutral,
> PublicKeyToken=b77a5c
> 561934e089
> mscorlib, Version=1.0.5000.0, Culture=neutral,
> PublicKeyToken=b77a5c561934e089
> System, Version=1.0.5000.0, Culture=neutral,
> PublicKeyToken=b77a5c561934e089
> System.Drawing, Version=1.0.5000.0, Culture=neutral,
> PublicKeyToken=b03f5f7f11d5
> 0a3a
> empDll, Version=1.1.0.0, Culture=neutral, PublicKeyToken=null
> ClientAssembly, Version=1.1.0.6, Culture=neutral, PublicKeyToken=null
> System.Xml, Version=1.0.5000.0, Culture=neutral,
> PublicKeyToken=b77a5c561934e089
>
> SharedAssembly, Version=1.1.0.6, Culture=neutral, PublicKeyToken=null
>
> Now at this Point I get a "File not Found" exception. The assembly
> "empDll"
> or one of it`s components can not be found.
>
> The AssemblyResolve Event is never fired.
>
> When I copy the assembly "empDll" locally into the directory where the
> launcher is, everything works fine again but in this case the
> Auto-Update-Feature does not work of course and everything is useless.
>
> In this case, the output is the following:
>
> Assembly Name: empGui.Form_Ali_Setup, AliGUI, Version=1.0.0.6,
> Culture=neutral,
> PublicKeyToken=null
> CodeBase: http://servername/Deployment/AliGUI.exe
> Dependencies:
> System.Web.Services, Version=1.0.5000.0, Culture=neutral,
> PublicKeyToken=b03f5f7
> f11d50a3a
> System.Windows.Forms, Version=1.0.5000.0, Culture=neutral,
> PublicKeyToken=b77a5c
> 561934e089
> mscorlib, Version=1.0.5000.0, Culture=neutral,
> PublicKeyToken=b77a5c561934e089
> System, Version=1.0.5000.0, Culture=neutral,
> PublicKeyToken=b77a5c561934e089
> System.Drawing, Version=1.0.5000.0, Culture=neutral,
> PublicKeyToken=b03f5f7f11d5
> 0a3a
> empDll, Version=1.1.0.0, Culture=neutral, PublicKeyToken=null
> ClientAssembly, Version=1.1.0.6, Culture=neutral, PublicKeyToken=null
> System.Xml, Version=1.0.5000.0, Culture=neutral,
> PublicKeyToken=b77a5c561934e089
>
> SharedAssembly, Version=1.1.0.6, Culture=neutral, PublicKeyToken=null
> AliGUI loaded Assembly: http://servername/Deployment/SharedAssembly.dll
> AliGUI loaded Assembly: http://servername/Deployment/SharedAssembly.dll
> AliGUI loaded Assembly: http://servername/Deployment/SharedAssembly.dll
> AliGUI loaded Assembly: http://servername/Deployment/SharedAssembly.dll
>
> As you can see, the Assembly "empDll" is loaded locally but the
> dependencies
> are downloaded from the deployment machine.
>
> As I already mentioned, the only differnce between the machines where Auto
> Updating works and the AssemblyResolve Event is fired and handeled and the
> machines where the file not found exception occurs is that on the working
> machines
> Visual Studio .Net is installed and on the Machines with file not found
> exception there is just .Net Framework 1.1 from Windows update.
>
> The special thing about "empDll" is that it is a managed c++ dll that is
> linked against native libs.
>
> Is there any difference between the .NET Framework from Windows Update and
> from Visual Studio or does anybody have any other idea what may be the
> difference between the machines here or how to force the AssemblyResolve
> Event to be fired?
>
> Thanks in Advance for your efforts
>
> Best Regards
>
> Chucker


.

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