GeoCoordinate.Unknown 欄位

定義

命名空間:

System.Device.Location

組件:

System.Device.dll

代表 GeoCoordinate 一個擁有未知緯度與經度場的物體。

public: static initonly System::Device::Location::GeoCoordinate ^ Unknown;

public static readonly System.Device.Location.GeoCoordinate Unknown;

 staticval mutable Unknown : System.Device.Location.GeoCoordinate

Public Shared ReadOnly Unknown As GeoCoordinate 

欄位值

GeoCoordinate

範例

以下程式碼範例驗證該地點是否 GeoCoordinate 對應於位置， Unknown 然後再列印出其緯度與經度。

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)
            {
                GeoCoordinate coord = watcher.Position.Location;

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

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

備註

此 IsUnknown 性質可用來驗證 a GeoCoordinate 是否包含任何資料。