How do I add IFrame in a Silverlight 4.0 User control ?
And I want a button on the control that refreshes the IFrame. Is that possible?
To render HTML on top of silverlight, you have to use WindowLess mode. This is a configuration in the object tag. Then you'll need to manually program your IFrame to float in the correct location using javascript or the bridge provided by Silverlight. You can use a commercial control like Robaticus suggested or figure it out on your own.
Either way, none of these options work for Mac. So if you're developing for Windows only, then you're ok. Anyone using Mac will not see any HTML float on top of Silverlight.
If you absolutely want an IFrame in the HTML page (contrary to what the other answers suggest) you could obtain access to the IFrame in Silverlight by using the HTML Bridge
I think you can use WebBrowser class to display IFrame content in Silverlight. Or check this link it will also help you. - How to use iFrame tag in XAML Silverlight 4?
The iframe tag is HTML, not Silverlight. If you have an out-of-browser Silverlight application, you could potentially use the WebBrowser control, but this is not available for in-browser applications.
There is an approach out there where you can essentially make a DIV on your hosting page appear overtop of your Silverlight application, but, in my experience, this is very hard to control, and the visual results are less-than-ideal.
Additionally, there are a few commercial components that do HTML rendering, but they all seem to use the same approach of a floating DIV, and they are not as reliable as I would like to see them.
Related
From what I know, browsers that are based on WebKit have been built around the open source webkit project after they downloaded it and built it, so if one were to build a browser around the Trident rendering engine/Internet Explorer's rendering engine, would you-
Download Trident from somewhere, build it and add it to your project, or;
Add a System.Windows.Forms.WebBrowser Control to your Form and use that?
I believe that the System.Windows.Forms.WebBrowser control is indeed based on IE's Trident engine. however it is highly limited in what it can and can't do, by default.
You can however modify application specific settings for your browser to enable features through the control.
An example of this is that the WebBrowser control, by default, renders using the lowest setting supported by the version of IE installed on the machine, so for example if you have IE9 installed, the WebBrowser control will render in IE7 compatibility mode, but you can make it render using IE9 standards based mode if you change/add some settings to the registry.
Take a look at implementing/modifying Internet Feature Controls here:
http://msdn.microsoft.com/en-us/library/ee330720%28v=vs.85%29.aspx
On another note, I think you'd be hard pushed to find a download for Trident. Being a Microsoft product, my guess is that it's a closely guarded, closed source, secret! - However of you do find a download for it, I'd be very interested to know more! :-)
I'm in a trouble trying to fix some problem.. I have a program with Webbrowser control inside it.
It automates crawling process from some website. The problem is that I cannot fix webbrowser after recent website changes.
They have changed page navigation on website. And when I do actions MANUALLY in webbrowser (in my app) it doesn't go to the next/previous page on website. It does nothing... Whereas it works properly in IE 7/8/9 (only scripting errors thrown this time).
So does it mean that Webbrowser is not fully similar to IE??
I'm sorry for not showing source codes here, I think it wouldn't help here. Which way should I go to troubleshoot it? Why page navigation is not working in Webbrowser control?
I tried to simply put Webbrowser on a Window Form in new project and tried to navigate page 2/3/../10 in the website catalog, but it simply changes page number and doesn't navigate to it...
EDIT: Website doesn't work propely even if I do actions manually in webbrowser using mouse clicks.. but works in IE.
EDIT2: I might be not clear in my question. The problem is that I cannot use website even Manually with mouseclicks via my Webbrowser control in app. It changes page number after I click on it, but it doesn't navigate to that page. It stays silent. I'm sure that AllowNavigation property is true. It worked just yesterday and stopped after website changes today... Please tell me which way should I go to troubleshoot it.. I thought that Webbrowser control acts the same way as Internet Explorer.. Any help from you highly appreciated! Thanks
EDIT3: Strange thing... i just loaded Extended Webbrowser and navigated to that website. Page navigation panel doesn't work there also.. Is it a bug on their side or some type of guard from crawlers? What do you think?
(http://www.codeproject.com/KB/cpp/ExtendedWebBrowser.aspx)
I'm sure this isn't the answer your want but using the webbrowser control to scrape websites is very painful to maintain.
Instead use the HttpWebRequest and HttpWebRepsonse objects to recreate the calls to the webserver.
You can use Fiddler (http://www.fiddler2.com/fiddler2) and your browser to record your web sessions and recreate them in code.
You can setup your webbrowser control to disable a number of features including navigation.
I.e. to disable nav in the C# WebBrowser control:
webBrowser1.AllowNavigation = false;
I'd double check that you're not doing anything like this.
I had the same issue with a certain web site that recently changed its format. It has to do with the version of IE used by the control.
Simply force the IE version used to the latest (in my case 9). Setting the appropriate registry item to 9999 for my application worked; see: Webbrowser control behaving different than IE
I am building a windows forms application that I will be adding a control within that will display quite a bit of different data. For the most part the data inside will be navigation buttons and help/training text.
I think it would be ideal if I could write the contents in HTML and then just display that in the control in the application, but I am not sure if this is a good idea.
Another point to note is there will be a web based version of the same application at some point in the near future, and doing this part of the application in HTML will make for very easy reusability.
The users will not have IIS installed, if this matters.
For this purpose, I think that an embedded web browser would be absolutely great. Alot of applications use a web browser control for navigation, information, training, etc. Steam is one example. In addition, reusability is almost always a best practice.
But I would use WebKit instead of the built-in IE web browser control.
I have a similar application and I think the WebBrowser control works very well. If you think it's what you need, I would for it and there's many other applications that do something similar. You can call Javascript functions in the HTML page from C# using HtmlDocument.InvokeScript(), and C# from Javascript using window.external and having this two-way communication makes life simple.
Users do not need IIS installed as you're not running a web server, just displaying content using HTML.
I would go for the built-in IE control rather than webkitdotnet to be honest. Although WebKit itself is superior to IE, the webkitdotnet project at version 0.5 it doesn't have the C#<> JavaScript communication or DOM access and it seems hard to tell if it's still being actively developed. It'll be great if/when it gets feature parity as IE is obviously far from perfect, but the advantage of the built-in IE control is every user of your app will have it already installed and the WebBrowser control is well tested. There are some disadvantages I've found:
IE versions may range from 6 to 9, so you'll to test to make sure your content works in all (as with a website).
There's a bug in IE (at least up to 8) that relative links do not work in combination with a <base href="file://...">. This can stop you being able to use relative links in your local HTML documents.
Sometimes pages display differently inside the WebBrowser control than they do out of it. For instance, http://bugs.jquery.com/ticket/7104 is one and I've come across another similar bug affecting cufon.
For compatibility reasons, even if your users install IE > 7 the WebBrowser control will still render your content in IE7 rendering mode by default. This is different to standalone IE which renders in the most-standard mode by default, so it can catch you out if you're not expecting it. You can change this by adding <meta http-equiv="X-UA-Compatible" tag if you want, though I actually found it makes life easier as it reduces the amount of different versions you've got to test against.
It is possible to embed an XBAP application into an IFrame, this is rather easy !!
The problem however is that it renders on top of anything within the web application. For example!
I have a menu in my web application which can collapse when I hover above it, but it will collapse UNDER the IFrame when it needs to collapse ON TOP of the IFrame with the XBAP Application in it.
I tried messing with the z-index but this does not fix anything!
It seems it has nothing to do with the IFrame, because when I put plain HTML into the IFrame it renders on top of the IFrame.
My last effort would be to put the XBAP Application in new browser window !! But it would be so much nicer to have it embedded within the application.
This guy seems to have the same problem
This is a known issue with controls/plugins that aren't rendered by the browser itself (these controls have their own windows, which are merely positioned inside the browser instead of composed within it). If you're willing to use Silverlight instead, there is a partial solution available with windowless controls that will allow you to intermix DOM content and managed code, but they have their own limitations. The upcoming Silverlight 4 can do even more than XBAPs as far as local trust/resource access...
How to use C# to capture a image of a specific url?
I want to use C# to automatically capture a image of a webpage based on a specific url.
For example, I have a page contains a txtUrl.Text = "http://www.some.com/index.aspx" , then I click a button, how can I capture a image of that Url?
I assume you want to do this from ASP.NET (as opposed to from a WinForms application).
In your web project, add a reference to System.Windows.Forms (yes, this is a bad thing to do). In your code-behind, you can then create an object of type System.Windows.Forms.WebBrowser:
WebBrowser browser = new WebBrowser();
// this will load up a URL into the web browser:
browser.Navigate(#"http://www.stackoverflow.com");
Next, just use the BitBlt API function (sorry, I don't have a link handy) to copy the WebBrowser control's graphical display to a Bitmap (which you can then display or save or whatever). With this function, the WebBrowser's Handle property is one of the parameters to pass.
Update: here's a link to some code that does exactly what you need: http://www.developerfusion.com/code/4712/generate-an-image-of-a-web-page/
If you mean a visual of the webpage, one approach is to integrate IE to your application and programmatically taking a screenshot. This (for the integrated web browser) and this (for taking screenshots with C#) may be of use. This is of course IE dependent.
Another option is using the shotserver and shotfactory projects used for browsershots.org. They can be found here, though I'm not sure if there's a .NET API for it.
I don't think that is really possible only using C#. That is because C#, or the .NET framework for that matter, don't offer any kind of HTML markup rendering capabilities. The closest you can get - in my opinion - would be to use a WebBrowser control and then try to somehow capture it's graphical output (which would be the rendered page).
The other way to do it would be to look for a .NET component that might do what you want.. Although I don't know of any that do.