How to tell if there is a console

问题

Ive some library code that is used by both console and wpf apps. In the library code, there are some Console.Read() calls. I only want to do those input reads if the app is a console app not if its a GUI app - how to tell in dll if the app has a console?

回答1:

Work for me (using native method)

First, declare:

    [DllImport("kernel32.dll")]
    static extern IntPtr GetConsoleWindow();

After, check with elegance... hahaha...:

if (GetConsoleWindow() != IntPtr.Zero)
{
    Console.Write("has console");
}

回答2:

In the end I did as follows:

// Property:
private bool? _console_present;
public bool console_present {
    get {
        if (_console_present == null) {
            _console_present = true;
            try { int window_height = Console.WindowHeight; }
            catch { _console_present = false; }
        }
        return _console_present.Value;
    }
}

//Usage
if (console_present)
    Console.Read();

Following thekips advice I added a delegate member to library class to get user validation - and set this to a default implimentation that uses above to check if theres a console and if present uses that to get user validation or does nothing if not (action goes ahead without user validation). This means:

All existing clients (command line apps, windows services (no user interaction), wpf apps) all work with out change.
Any non console app that needs input can just replace the default delegate with someother (GUI - msg box etc) validation.

Thanks to all who replied.

回答3:

if (Environment.UserInteractive)
{
    // A console is opened
}

See: http://msdn.microsoft.com/en-us/library/system.environment.userinteractive(v=vs.110).aspx

Gets a value indicating whether the current process is running in user interactive mode.

回答4:

You can use this code:

public static bool HasMainWindow()
{
    return (Process.GetCurrentProcess().MainWindowHandle != IntPtr.Zero);
}

Worked fine with quick test on Console vs. WinForms application.

回答5:

You should fix this in your design. This is a nice example of a place in which inversion of control would be very handy. As the calling code is aware of which UI is available this code should specify an instance of a IInputReader interface for example. This way you can use the same code for multiple scenarios for getting input from the user.

回答6:

You can pass argument on initialize.

for example:

In your library class, add constructor with 'IsConsole' parameter.

public YourLibrary(bool IsConsole)
{
  if (IsConsole)
  {
     // Do console work
  }
  else 
  {
     // Do wpf work
  }
}

And from Console you can use:

YourLibrary lib = new YourLibrary(true);

Form wpf:

YourLibrary lib = new YourLibrary(false);

回答7:

This SO question may provide you some solution...

Another solution is:

Console.Read() returns -1 in windows form application without opening up a console window. In console app it returns the actual value. So you can write something like

        int j = Console.Read();
        if (j == -1)
            MessageBox.Show("Its not a console app");
        else
            Console.WriteLine("It's a console app");

I tested this code on console and winform apps. In console app, if user inputs '-1', the value of j is 45. So it will work.

回答8:

if you want a good design, abstract the GUI dependences using an interface. Implements a concrete class for the console version, another for the WPF version, and inject the correct version using any way (dependency injection, inversion of control, etc).

回答9:

I rewrote @Ricibob's answer

public bool console_present {
    get {
        try { return Console.WindowHeight > 0; }
        catch { return false; }
    }
}

//Usage
if (console_present) { Console.Read(); }

It is simpler, but I prefer this native implementation:

[DllImport("kernel32.dll")]
static extern IntPtr GetConsoleWindow();

//Usage
if (GetConsoleWindow()) { Console.Read(); }

回答10:

This is a modern (2018) answer to an old question.

var isReallyAConsoleWindow = Environment.UserInteractive && Console.Title.Length > 0;

The combination of Environment.UserInteractive and Console.Title.Length should give a proper answer to the question of a console window. It is a simple and straight forward solution.

来源：https://stackoverflow.com/questions/6408588/how-to-tell-if-there-is-a-console

标签

console