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.NET Forum / Languages / VB.NET / October 2007.NET Equivalent of an Applet?
Does the .NET framework provide any equivalent of an applet? I've under Winforms Hosted in IE - but Security is a major headache. Is there a way to bypass these security headaches? Can I sign the control, etc. etc? >Does the .NET framework provide any equivalent of an applet? You mean a Java applet? Have you looked at Silverlight? Mattias  SignatureMattias Sjögren [C# MVP] mattias @ mvps.org http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com Please reply only to the newsgroup. >>Does the .NET framework provide any equivalent of an applet? > > You mean a Java applet? > > Have you looked at Silverlight? Ya silverlight comes close - but unfortunately it requires yet another runtime. <sigh> Also the tools don't seem to be production quality? I guess silverlight is Microsoft's answer? >>>Does the .NET framework provide any equivalent of an applet? >> [quoted text clipped - 8 lines] > >I guess silverlight is Microsoft's answer? Alas, there's no getting away from runtimes. Every solution requires a runtime: - Flash - Applets (Java JRE) - Silverlight - XBAP (.NET Framework 3) -- http://bytes.thinkersroom.com > Alas, there's no getting away from runtimes. Every solution requires a > runtime: [quoted text clipped - 3 lines] > - Silverlight > - XBAP (.NET Framework 3) True, but Flash and Applets have been around for ages. .NET already has a runtime (the framework) ... so I'm surprised it's not included in the base framework itself, but it's yet another installation. >> Alas, there's no getting away from runtimes. Every solution requires a >> runtime: [quoted text clipped - 7 lines] >runtime (the framework) ... so I'm surprised it's not included in the base >framework itself, but it's yet another installation. I'm guessing you're referring to Silverlight. I guess in the next OS it will come built into the OS (unless of course people go to court challenging the competitiveness!) -- http://bytes.thinkersroom.com > Does the .NET framework provide any equivalent of an applet? > > I've under Winforms Hosted in IE - but Security is a major headache. > > Is there a way to bypass these security headaches? Can I sign the control, > etc. etc? As Mattias suggested there is silverlight - which has the advantage of being cross platform, there is even a port underway for linux, known as moonlight. The biggest problem with silverlight, is really that it is so new - there aren't a lot of controls for it (that could have changed by now, the last time I lookes was about 3 or 4 months ago), and so unless your doing media work, it might not be up to what you need to do. The other option is the xbap - or xml browser application. They can be hosted inside of an iframe in an asp or html page. xbap's are click once applications that run inside of a sandbox, which is there biggest problem. Right now, that sandbox, IMHO, is way to restrictive. It is supposedly going to loosen over time, but right now it really depends on what you want to do and who your audience is that should be the determining factor. So, describe what you want the applet to do (in a general sense), and maybe you might get a better, more specific answer :) -- Tom Shelton > As Mattias suggested there is silverlight - which has the advantage of > being cross platform, there is even a port underway for linux, known [quoted text clipped - 3 lines] > and so unless your doing media work, it might not be up to what you > need to do. I basically want to deploy an application via the browser. The application needs to send and receive state information continously from a central server. I could use AJAX for this type of thing, but I have not found the reliablity to be there (i.e. 8 hour work days). > The other option is the xbap - or xml browser application. They can > be hosted inside of an iframe in an asp or html page. xbap's are [quoted text clipped - 3 lines] > now it really depends on what you want to do and who your audience is > that should be the determining factor. So true - the sandbox is much too restrictive. It would be nice to be able to make a network connection back to the host with our a security exception! > So, describe what you want the applet to do (in a general sense), and > maybe you might get a better, more specific answer :) I'm building a client which talks to a central server. The client controls the state of the user on the server side. When the server detects that the user is in a particular state... and has a particular piece of work for the user, the server will send the work to the client. Couple issues: 1. The information must be transmitted to the client ASAP (i.e. no delay!) 2. Application must be deploy via a web browser. If this were a desktop app, this would be a piece of cake... but because it's in a browser, I'm struggling with the technological limitations. Here are the technologies I looked at: 1. Java 2. .NET WinForms Control - Too much security 3. Silverlight - Too new, yet another runtime 4. Flash/Flex - no skills 5. AJAX - don't think it's reliable enough and requires polling which seems to cause issues with IE Users will be intranet users - but I won't be able to change too many security settings, so I'm stuck with the basic IE settings. So I was hoping .NET would have something equivalent to Java Applets / Java Web Start which has a decent set of permissions...but I guess not? > > As Mattias suggested there is silverlight - which has the advantage of > > being cross platform, there is even a port underway for linux, known [quoted text clipped - 55 lines] > So I was hoping .NET would have something equivalent to Java Applets / > Java Web Start which has a decent set of permissions...but I guess not? Hmmm, sounds like an XBAP is almost perfect... The big problem that you would have to overcome is the security restrictions on network communication. Off the top of my head, the way to overcome this would depend on if you were going to use .NET 3.0 or .NET 3.5 :) If in 3.0, then you could write a simple asp.net page, that you could periodically request from the server that could esentially pull data from the server and return it to you - it could even be a serialized object, as long as it is xml serialization (or xaml). One word of warning on this approach - if you plan on displaying web content in a frame control in 3.0 in an xbap hosted inside of an iframe, forget about it. In 3.5, you can actually use WCF web services from an XBAP. Still sort of a polling method, but maybe a little cleaner. Personally, I think they should do like they do in java and allow you to open a connection back to your server of origin with a socket.... -- Tom Shelton Tom Shelton <tom_shelton@comcast.net> wrote in news:1192738638.711523.44120 @t8g2000prg.googlegroups.com: > In 3.5, you can actually use WCF web services from an XBAP. Still > sort of a polling method, but maybe a little cleaner. Personally, I > think they should do like they do in java and allow you to open a > connection back to your server of origin with a socket.... My thoughts exactly! Without the ability to open a socket to the origin server, it really limits the type of browser applications one can build. Polling is fine for some stuff, but for application which need instant notification (and the ability to scale), polling sucks. Thanks for the information about XBAP... I'll take a look at it :-) > Tom Shelton <tom_shel...@comcast.net> wrote in news:1192738638.711523.44120 > @t8g2000prg.googlegroups.com: [quoted text clipped - 11 lines] > > Thanks for the information about XBAP... I'll take a look at it :-) Here is a white paper on the wpf sandbox. It might give you a more general feeling as to what you can and can't do, and if an XBAP is right for you.... I'm actually creating an XBAP for my current project, and to do what I want, I had to make it full trust. Which in this particular case, isn't an issue - but, if you intend it for internet consumption, then it isn't really a viable option. http://msdn2.microsoft.com/en-us/library/Aa480229.aspx -- Tom Shelton This would left you with : - Java You may want also to post about the ogrinal security problem you have but if I remember you can cojnect with the originating site but not with third party sites... -- Patrice >> As Mattias suggested there is silverlight - which has the advantage of >> being cross platform, there is even a port underway for linux, known [quoted text clipped - 55 lines] > So I was hoping .NET would have something equivalent to Java Applets / > Java Web Start which has a decent set of permissions...but I guess not? > This would left you with : > - Java > > You may want also to post about the ogrinal security problem you have > but if I remember you can cojnect with the originating site but not > with third party sites... Supposed with .NET Winform controls you could connect to the origin site, but I was never able to get it working unless the origin site was localhost! If it's an intranet, or even 127.0.0.1 IP it would throw an security exception. I had to give my .NET control full trust before it would work. Yes, I think Java is the most viable solution - I'm surprised with .NET's comparisons with Java, Microsoft hasn't stepped upto the plate this area (browser applets/browser launched applications). Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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