NetworkChange.NetworkAvailabilityChanged 事件
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。
当网络的可用性发生更改时发生。
public:
static event System::Net::NetworkInformation::NetworkAvailabilityChangedEventHandler ^ NetworkAvailabilityChanged;[System.Runtime.Versioning.UnsupportedOSPlatform("illumos")]
[System.Runtime.Versioning.UnsupportedOSPlatform("solaris")]
public static event System.Net.NetworkInformation.NetworkAvailabilityChangedEventHandler? NetworkAvailabilityChanged;[System.Runtime.Versioning.UnsupportedOSPlatform("illumos")]
[System.Runtime.Versioning.UnsupportedOSPlatform("solaris")]
[System.Runtime.Versioning.UnsupportedOSPlatform("haiku")]
public static event System.Net.NetworkInformation.NetworkAvailabilityChangedEventHandler? NetworkAvailabilityChanged;public static event System.Net.NetworkInformation.NetworkAvailabilityChangedEventHandler? NetworkAvailabilityChanged;public static event System.Net.NetworkInformation.NetworkAvailabilityChangedEventHandler NetworkAvailabilityChanged;[<System.Runtime.Versioning.UnsupportedOSPlatform("illumos")>]
[<System.Runtime.Versioning.UnsupportedOSPlatform("solaris")>]
member this.NetworkAvailabilityChanged : System.Net.NetworkInformation.NetworkAvailabilityChangedEventHandler [<System.Runtime.Versioning.UnsupportedOSPlatform("illumos")>]
[<System.Runtime.Versioning.UnsupportedOSPlatform("solaris")>]
[<System.Runtime.Versioning.UnsupportedOSPlatform("haiku")>]
member this.NetworkAvailabilityChanged : System.Net.NetworkInformation.NetworkAvailabilityChangedEventHandler member this.NetworkAvailabilityChanged : System.Net.NetworkInformation.NetworkAvailabilityChangedEventHandler Public Shared Custom Event NetworkAvailabilityChanged As NetworkAvailabilityChangedEventHandler 事件类型
- 属性
注解
当网络的可用性发生更改时，该 NetworkChange 类将引发 NetworkAvailabilityChanged 事件。 当至少有一个网络接口标记为“up”且不是隧道或环回接口时，网络可用。
若要使 NetworkChange 对象在事件发生时 NetworkAvailabilityChanged 调用事件处理方法，必须将该方法与 NetworkAvailabilityChangedEventHandler 委托相关联，并将此委托添加到此事件。
