StatusChangedEventArgs 类

定义

命名空间:

Windows.Devices.Geolocation

提供 StatusChanged 事件的信息。

public ref class StatusChangedEventArgs sealed

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
class StatusChangedEventArgs final

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
public sealed class StatusChangedEventArgs

Public NotInheritable Class StatusChangedEventArgs

继承

Object Platform::Object IInspectable StatusChangedEventArgs

属性

ContractVersionAttribute MarshalingBehaviorAttribute

Windows 要求

设备系列	Windows 10 (在 10.0.10240.0 中引入)
API contract	Windows.Foundation.UniversalApiContract (在 v1.0 中引入)
应用功能	location ID_CAP_LOCATION [Windows Phone]

示例

此代码示例演示如何处理 StatusChanged 事件。 Geolocator 对象触发 StatusChanged 事件以指示用户位置设置已更改。 该事件通过参数的 Status 属性（类型为 PositionStatus）传递相应的状态。 请注意，此方法不是从 UI 线程中调用的，并且 Dispatcher 对象调用了 UI 更改。 有关详细信息，请参阅获取当前位置。

using Windows.UI.Core;
...
async private void OnStatusChanged(Geolocator sender, StatusChangedEventArgs e)
{
    await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
    {
        // Show the location setting message only if status is disabled.
        LocationDisabledMessage.Visibility = Visibility.Collapsed;

        switch (e.Status)
        {
            case PositionStatus.Ready:
                // Location platform is providing valid data.

                // notify user: Location platform is ready
                break;

            case PositionStatus.Initializing:
                // Location platform is attempting to acquire a fix. 

                // notify user: Location platform is attempting to obtain a position
                break;

            case PositionStatus.NoData:
                // Location platform could not obtain location data.

                // notify user: Not able to determine the location
                break;

            case PositionStatus.Disabled:
                // The permission to access location data is denied by the user or other policies.

                // notify user: Access to location is denied

                // Clear cached location data if any
                break;

            case PositionStatus.NotInitialized:
                // The location platform is not initialized. This indicates that the application 
                // has not made a request for location data.

                // notify user: No request for location is made yet
                break;

            case PositionStatus.NotAvailable:
                // The location platform is not available on this version of the OS.

                // notify user: Location is not available on this version of the OS
                break;

            default:
                // unknown case
                break;
        }
    });
}

注解

此对象是传递给 StatusChanged 事件的处理程序的参数。

属性

Status

Geolocator 对象的更新状态。

另请参阅

• 地理位置示例 (Windows 10)