Dns.BeginGetHostByName(String, AsyncCallback, Object) 方法
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。
注意
BeginGetHostByName is obsoleted for this type, please use BeginGetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202
注意
BeginGetHostByName has been deprecated. Use BeginGetHostEntry instead.
注意
BeginGetHostByName is obsoleted for this type, please use BeginGetHostEntry instead. http://go.microsoft.com/fwlink/?linkid=14202
开始异步请求关于指定 DNS 主机名的 IPHostEntry 信息。
public:
static IAsyncResult ^ BeginGetHostByName(System::String ^ hostName, AsyncCallback ^ requestCallback, System::Object ^ stateObject);[System.Obsolete("BeginGetHostByName is obsoleted for this type, please use BeginGetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202")]
public static IAsyncResult BeginGetHostByName (string hostName, AsyncCallback? requestCallback, object? stateObject);[System.Obsolete("BeginGetHostByName has been deprecated. Use BeginGetHostEntry instead.")]
public static IAsyncResult BeginGetHostByName (string hostName, AsyncCallback? requestCallback, object? stateObject);[System.Obsolete("BeginGetHostByName is obsoleted for this type, please use BeginGetHostEntry instead. http://go.microsoft.com/fwlink/?linkid=14202")]
public static IAsyncResult BeginGetHostByName (string hostName, AsyncCallback requestCallback, object stateObject);[System.Obsolete("BeginGetHostByName is obsoleted for this type, please use BeginGetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202")]
public static IAsyncResult BeginGetHostByName (string hostName, AsyncCallback requestCallback, object stateObject);public static IAsyncResult BeginGetHostByName (string hostName, AsyncCallback requestCallback, object stateObject);[<System.Obsolete("BeginGetHostByName is obsoleted for this type, please use BeginGetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202")>]
static member BeginGetHostByName : string * AsyncCallback * obj -> IAsyncResult[<System.Obsolete("BeginGetHostByName has been deprecated. Use BeginGetHostEntry instead.")>]
static member BeginGetHostByName : string * AsyncCallback * obj -> IAsyncResult[<System.Obsolete("BeginGetHostByName is obsoleted for this type, please use BeginGetHostEntry instead. http://go.microsoft.com/fwlink/?linkid=14202")>]
static member BeginGetHostByName : string * AsyncCallback * obj -> IAsyncResultstatic member BeginGetHostByName : string * AsyncCallback * obj -> IAsyncResultPublic Shared Function BeginGetHostByName (hostName As String, requestCallback As AsyncCallback, stateObject As Object) As IAsyncResult参数
- hostName
- String
主机的 DNS 名称。
- requestCallback
- AsyncCallback
一个 AsyncCallback 委托，它引用操作完成时要调用的方法。
- stateObject
- Object
一个用户定义对象，其中包含操作的相关信息。 当操作完成时，此对象会被传递给 requestCallback 委托。
返回
引用异步请求的 IAsyncResult 实例。
- 属性
例外
hostName 为 null。
执行 DNS 查询时遇到错误。
注解
BeginGetHostByName异步操作必须通过调用 EndGetHostByName 方法完成。 通常，委托调用 requestCallback 方法。
在操作完成之前，此方法不会阻止。 若要阻止操作完成，请使用 GetHostByName 方法。
有关使用异步编程模型的详细信息，请参阅 异步调用同步方法。
注意
在应用程序中启用网络跟踪时，此成员发出跟踪信息。 有关详细信息，请参阅 .NET Framework 中的网络跟踪。
