IsUnknown Property
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GeoCoordinate.IsUnknown Property

Gets a value that indicates whether the GeoCoordinate does not contain latitude or longitude data.

Namespace:  System.Device.Location
Assembly:  System.Device (in System.Device.dll)

public bool IsUnknown { get; }

Property Value

Type: System.Boolean
true if the GeoCoordinate does not contain latitude or longitude data; otherwise, false.

A GeoCoordinate that does not contain latitude or longitude data is equal to Unknown.

The following code example verifies whether the GeoCoordinate that corresponds to a location is Unknown before printing out its latitude and longitude.


using System;
using System.Device.Location;

namespace GetLocationPropertyHandleUnknown
{
    class Program
    {
        static void Main(string[] args)
        {
            GetLocationPropertyHandleUnknown();
        }

        static void GetLocationPropertyHandleUnknown()
        {
            GeoCoordinateWatcher watcher = new GeoCoordinateWatcher();
            watcher.TryStart(false, TimeSpan.FromMilliseconds(1000));

            if (watcher.Position.Location.IsUnknown != true)
            {
                GeoCoordinate coord = watcher.Position.Location;

                Console.WriteLine("Lat: {0}, Long: {1}",
                    coord.Latitude,
                    coord.Longitude);
            }
            else
            {
                Console.WriteLine("Unknown");
            }

        }

    }
}


.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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