How do I detect if a Windows device is touch-enabled

问题

How do I detect if a device is touch-enabled in c# for a WinForms app (Not WPF).

I found information on GetSystemMetrics...can't find how to use this in c#.

I Tried using System.Windows.Input.Tablet class..not coming up in c#, even though I am using .Net Framework 4.5.

I Tried using System.Windows.Devices...not coming up in c#, even though I am using .Net Framework 4.5.

I have also checked This and This, which would seem to make this question a duplicate. However, neither of these answers my question.

回答1:

GetSystemMetrics seems to be the right way to go. It should be accessed through p/invoke like this:

[System.Runtime.InteropServices.DllImport("user32.dll")]
public static extern int GetSystemMetrics(int nIndex);

public static bool IsTouchEnabled()
{
     const int MAXTOUCHES_INDEX = 95;
     int maxTouches = GetSystemMetrics(MAXTOUCHES_INDEX);

     return maxTouches > 0;
}

回答2:

As taken from this answer

var hasTouch = Windows.Devices.Input
              .PointerDevice.GetPointerDevices()
              .Any(p => p.PointerDeviceType == Windows.Devices.Input.PointerDeviceType.Touch);

来源：https://stackoverflow.com/questions/27803965/how-do-i-detect-if-a-windows-device-is-touch-enabled