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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)

'Declaration
Public ReadOnly Property IsUnknown As Boolean
	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.


Imports System.Device.Location
Module GetLocationProperty
    Public Sub GetLocationPropertyHandleUnknown()
        Dim watcher As New System.Device.Location.GeoCoordinateWatcher()
        watcher.TryStart(False, TimeSpan.FromMilliseconds(1000))
        If watcher.Position.Location.IsUnknown <> True Then
            Dim coord As GeoCoordinate = watcher.Position.Location
            Console.WriteLine("Lat: {0}, Long: {1}", coord.Latitude, coord.Longitude)
        Else
            Console.WriteLine("Unknown latitude and longitude.")
        End If
    End Sub

    Public Sub Main()
        GetLocationPropertyHandleUnknown()
        Console.ReadLine()
    End Sub

End Module


.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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