Create an Instance

Steve

Hi,

Just stumbled across this bit of code and need assistance please.

SHDocVw.InternetExplorer ie = new SHDocVw.InternetExplorerClass();

Ive tried to replicate this with custom code but to no avail!?

Im aware SHDocVw is the using, is InternetExplorer a static class?

and why SHDocVw.InternetExplorerClass(); at the end - and not the same as the first part of code ie SHDocVw.InternetExplorer?

Thanks

Steve

13 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes15y ago
Accepted answer
I think I'm right in saying that InternetExplorer is an interface and InternetExplorerClass is a class which implements this interface and so you can assign it to an interface variable.
Although it doesn't look like it will, this should also work:
SHDocVw.InternetExplorer ie = new SHDocVw.InternetExplorer();
This is because there's both a class and an interface called InternetExplorer and whilst COM can deal with the name duplication, .NET cannot. So the class is hidden in the object browser but is actually instantiated behind the scenes when you 'new up' the interface.
Excel has a similar state of affairs with its Application object (see http://www.c-sharpcorner.com/Forums/Thread/115867/instanciating-an-interface-excel-application.aspx).
Sam Hobbs15y ago
InternetExplorerClass and InternetExplorer are the same and InternetExplorer should always be used unless it does not work and if InternetExplorerClass does work instead then use it. I know that is vague but it is the best advice I can give based on my understanding.

The only explanation of the difference that I have found is that InternetExplorerClass is sometimes needed to avoid use of the InternetExplorer name that is used elsewhere. I forget what that elsewhere is but I know I have seen in the MSDN that there is an explanation.

Steve, I don't know what more you need to do but my Introduction to Web Site Scraping might help too.
Suthish Nair15y ago
Vulpes, Ok, i was trying to learn something... Thanks to Steve for posting this thread :)
Vulpes15y ago
Suthish, Steve was just asking about the syntax of the statement which looks odd.

There was never any doubt that the code would work :)
Suthish Nair15y ago
After above setting the error goes and its working now.. What about you Steve..
Suthish Nair15y ago
ok..
Right click the offending assembly that you added in the solution explorer (In my case SHDocVw)
Click properties.
And there should be the option there for Embed Interop Assembly.
Set it to False
The error goes, can you try now.

Am trying this library first time, so no idea what it does.

Needs to do find an msdn article..
Vulpes15y ago
SHDocVw is a namespace and you can always fully qualify a type name in C# by preceding it with its namespace (if any).

It's actually unnecessary here as you have the following line in your program:

using SHDocVw;
Suthish Nair15y ago
Hmm.. am trying to help..

Its working for me in web application... using VS2010..

check the attachment..
Steve15y ago
Thanks kindly Vulpes,

So how is SHDocVw.InternetExplorerClass(); possible, ie the SHDocVw listed before InternetExplorerClass?
Steve15y ago
Can you help or not?
Suthish Nair15y ago
did you refer the link posted?
Steve15y ago
Hi Suthish

The code as requested is below:-

using SHDocVw;

public void OpenBrowser(string url)
{
        object o = null;

        SHDocVw.InternetExplorer ie = new SHDocVw.InternetExplorerClass();

        IWebBrowserApp wb = (IWebBrowserApp) ie;
        wb.Visible = true;
        wb.Navigate(url, ref o, ref o, ref o, ref o);
}

Its the SHDocVw.InternetExplorer ie = new SHDocVw.InternetExplorerClass(); statement thats throwing me?

Thanks
Suthish Nair15y ago
Can you attach/upload the code..

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