visual c# open own file extention

Question

hello everybody, first: i'm dutch so sorry if my english is not so good.

I have made my own file type (.ddd) and I made a simple program to open this file type, but wenn i click on a .ddd file (on my desktop) my program opens only the file is not automaticly opend inside my program.

how do I directly open the file in my program when it opens?

Answer 1

The windows shell passes the filename to your program as a command-line argument. Your program needs to read its command-line arguments and open the file specified there.

Answer 2

Did you include code in your Main() to read the commandline parameter? e.g.

static void Main(string[] args)
{
    string fileToOpen = "";
    if (args.Length == 1)    
       fileToOpen = args[0];

   ...
}

If you have done this, then I guess you haven't properly registered your program to open this file type. Right-click any .ddd file, select Properties, and where it says "Opens with:" make sure your program is shown. If not, click Change and browse to your program.

Answer 3

Are you looking to register the file extension in the registry?

Answer 4

I slitly changed charles m's post and this works fine:

string[] args = Environment.GetCommandLineArgs();
string fileToOpen = "";
if (args.Count() == 2)
{
    fileToOpen = args[1];
}

thanks for your suggestions, Ecross