private void button1_Click(object sender, System.EventArgs e) { IPHostEntry myHost=new IPHostEntry(); Dns.BeginResolve(textBox1.Text, new AsyncCallback(back),myHost); } private void back(IAsyncResult ar) { IPHostEntry myHost=(IPHostEntry) ar.AsyncState; }
红色那个AsyncState是什么意思？
2004-12-14 18:18
2004-12-17 22:08
| MSDN Home > .NET Framework > 参考 > 类库 > System.Web.Services.Protocols > WebClientAsyncResult 类 > 属性 |
WebClientAsyncResult.AsyncState 属性获取 Begin 方法异步调用的最后一个参数中提供的对象。 [Visual Basic]Public Overridable ReadOnly Property AsyncState As Object _ Implements IAsyncResult.AsyncState[C#]public virtual object AsyncState {get;}[C++]public: __property virtual Object* get_AsyncState();[JScript]public function get AsyncState() : Object; 属性值在 Begin 方法调用的最后一个参数中提供的 Object。 实现要求平台: Windows 98, Windows NT 4.0, Windows ME, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 系列, .NET Framework 精简版 请参见WebClientAsyncResult 类 | WebClientAsyncResult 成员 | System.Web.Services.Protocols 命名空间 | AsyncState |
2004-12-18 00:46
2004-12-18 00:47
2004-12-18 11:58
