I have added a Chromium WebBrowser to my C# application using the CefSharp library, and now want to add functionality to a 'Back' button, that will allow the user to navigate to the previous page.
As I understand, this would be done with the following line:
browser.WebBrowser.Back();
However, if I just write this line in the method that is called when the 'Back' button is pressed, then an exception is thrown, and my application breaks.
The exception says:
Exception was unhandled
An unhandled exception of type 'System.Exception' occurred in CefSharp.dll
Additional information: lBrowser instance is null. Browser has likely not finished initializing or is in the process of disposing.
Why am I getting this exception? If I hover my cursor over the line that the exception occurs on, a message pops up which says:
(extension) void lWebBrowser.Back()
Navigates back, must check lWebBrowser.CanGoBack before calling this method.
But, if I then move this line inside an if statement that checks the value of lWebBrowser.CanGoBack first, i.e.
if(browser.WebBrowser.CanGoBack){
browser.WebBrowser.Back();
}
then although my application will run, CanGoBack always appears to be false- any time I press the 'Back' button, the debug shown in my console indicates that it is false... but if try to assign it a value of true anywhere (i.e. when the user navigates to another page- so there is a page to go back to), for example:
browser.WebBrowser.CanGoBack = true;
I get a compile error which says:
Property or indexer 'lWebBrowser.CanGoBack' cannot be assigned to -- it is read only
So how can I force the browser to navigate back a page when the user clicks the 'back' button?
So it appears that the issue was to do with the version of CefSharp that I had installed/ the version I was referencing- it appears I had installed and was referencing the latest version, but the compiler seemed to think I was referencing an older version, and couldn't decide which one it thought it should use. After uninstalling CefSharp, removing all of the references I had made to it, and reinstalling it/ re-implementing my uses of it, my application now uses the browser correctly, and I am able to display and fully interact with the webpage I am displaying.