Remember App. chosen in 'Open With...' dialog

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Jeroen - 29 Jun 2007 11:49 GMT

The group and search engines revealed many hints on how to use the
'Open With...' dialog, for example at:

http://www.codeproject.com/csharp/openwith.asp

Now in addition to a solution as presented in the tutorial above, I
would like to remember the application that was chosen, so that I
don't have to ask the user next time.

The situation I'm trying to tackle is as follows. Our application
generates an html. I would like to offer them the 'Open With...'
dialog (they're familiar with) to let them choose the program they
want to use from then on to open html files generated in our
application.

Most commonly, we will have users that want to open html files
generated in _our_ application in MS Excel instead of their browser,
without changing the system wide setting for html files.

Any tips would be appreciated.

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Peter Ritchie [C# MVP] - 29 Jun 2007 15:40 GMT

If I understand you correctly: you want to have files with a given extension
open in different applications when they're clicked in Windows Explorer?

The only way to do that is to write an application that is associated with
an extension and open another application based on some non-extension
criteria.

That's what Visual Studio does with *.*proj files. A third application you
don't ever see checks the contents of the file then runs either Visual Studio
2003 or Visual Studio 2005...

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http://www.peterRitchie.com/blog/
Microsoft MVP, Visual Developer - Visual C#

> The group and search engines revealed many hints on how to use the
> 'Open With...' dialog, for example at:
[quoted text clipped - 16 lines]
>
> Any tips would be appreciated.

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Jeroen - 29 Jun 2007 16:16 GMT

On 29 jun, 16:40, Peter Ritchie [C# MVP] <PRS...@newsgroups.nospam>
wrote:

> If I understand you correctly: you want to have files with a given extension
> open in different applications when they're clicked in Windows Explorer?

Sorry, I probably explained the problem inadequately. In pseudocode,
the following is what I'm looking for:

/******************************/
class Example
{
    private static object SomeApplication = null;
    private static string FilePath = "C:\SomeJustCreatedFile.html";

    private void OpenMyFile ()
    {
        if (SomeApplication == null)
            SomeApplication = this.SelectAnApplicationThroughOPENWITH ();

        System.Diagnostics.Process process = new
System.Diagnostics.Process();
        process.Application = SomeApplication;
        process.File = FilePath;
        process.Start();
    }

    private object this.SelectAnApplicationThroughOPENWITH()
    {
        // Do something
    }
}
/*****************************************************/

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Remember App. chosen in 'Open With...' dialog

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