[c#] c# open file with default application and parameters

The most easy way to open a file with the default application is:

System.Diagnostics.Process.Start(@"c:\myPDF.pdf");

However, I would like to know if exists a way to set parameters to the default application, because I would like to open a pdf in a determinate page number.

I know how to do it creating a new process and setting the parameters, but this way I need to indicate the path of the application, and I would like to have a portable application and not to have to set the path of the application each time I use the application in other computer. My idea is that I expect that the computer has installed the pdf reader and only say what to page open.

Thanks.

Please add Settings under Properties for the Project and make use of them this way you have clean and easy configurable settings that can be configured as default

How To: Create a New Setting at Design Time

Update: after comments below

1. Right + Click on project
2. Add New Item
3. Under Visual C# Items -> General
4. Select Settings File

you can try with

Process process = new Process();
process.StartInfo.FileName = "yourProgram.exe";
process.StartInfo.Arguments = ..... //your parameters
process.Start();

I converted the VB code in the blog post linked by xsl to C# and modified it a bit:

public static bool TryGetRegisteredApplication(
                     string extension, out string registeredApp)
{
    string extensionId = GetClassesRootKeyDefaultValue(extension);
    if (extensionId == null)
    {
        registeredApp = null;
        return false;
    }

    string openCommand = GetClassesRootKeyDefaultValue(
            Path.Combine(new[] {extensionId, "shell", "open", "command"}));

    if (openCommand == null)
    {
        registeredApp = null;
        return false;
    }

    registeredApp = openCommand
                     .Replace("%1", string.Empty)
                     .Replace("\"", string.Empty)
                     .Trim();
    return true;
}

private static string GetClassesRootKeyDefaultValue(string keyPath)
{
    using (var key = Registry.ClassesRoot.OpenSubKey(keyPath))
    {
        if (key == null)
        {
            return null;
        }

        var defaultValue = key.GetValue(null);
        if (defaultValue == null)
        {
            return null;
        }

        return defaultValue.ToString();
    }
}

EDIT - this is unreliable. See Finding the default application for opening a particular file type on Windows.

this should be close!

public static void OpenWithDefaultProgram(string path)
{
    Process fileopener = new Process();
    fileopener.StartInfo.FileName = "explorer";
    fileopener.StartInfo.Arguments = "\"" + path + "\"";
    fileopener.Start();
}