GeoCoordinate.Unknown 字段
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
表示含有未知纬度和经度字段的 GeoCoordinate 对象。
public: static initonly System::Device::Location::GeoCoordinate ^ Unknown;public static readonly System.Device.Location.GeoCoordinate Unknown; staticval mutable Unknown : System.Device.Location.GeoCoordinatePublic Shared ReadOnly Unknown As GeoCoordinate 字段值
示例
下面的代码示例验证与某个位置对应的 是否 GeoCoordinate 在 Unknown 打印出其纬度和经度之前。
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");
}
}
}
}
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
注解
属性 IsUnknown 可用于验证 是否 GeoCoordinate 不包含任何数据。
