Dns.BeginGetHostEntry Méthode
Définition
Important
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Résout un nom d'hôte ou une adresse IP en instance de IPHostEntry de manière asynchrone.
Surcharges
BeginGetHostEntry(IPAddress, AsyncCallback, Object) |
Résout une adresse IP en instance de IPHostEntry de manière asynchrone. |
BeginGetHostEntry(String, AsyncCallback, Object) |
Résout un nom d'hôte ou une adresse IP en instance de IPHostEntry de manière asynchrone. |
BeginGetHostEntry(IPAddress, AsyncCallback, Object)
- Source:
- Dns.cs
- Source:
- Dns.cs
- Source:
- Dns.cs
Résout une adresse IP en instance de IPHostEntry de manière asynchrone.
public:
static IAsyncResult ^ BeginGetHostEntry(System::Net::IPAddress ^ address, AsyncCallback ^ requestCallback, System::Object ^ stateObject);
public static IAsyncResult BeginGetHostEntry (System.Net.IPAddress address, AsyncCallback? requestCallback, object? stateObject);
public static IAsyncResult BeginGetHostEntry (System.Net.IPAddress address, AsyncCallback requestCallback, object stateObject);
static member BeginGetHostEntry : System.Net.IPAddress * AsyncCallback * obj -> IAsyncResult
Public Shared Function BeginGetHostEntry (address As IPAddress, requestCallback As AsyncCallback, stateObject As Object) As IAsyncResult
Paramètres
- address
- IPAddress
Adresse IP à résoudre.
- requestCallback
- AsyncCallback
Délégué AsyncCallback qui fait référence à la méthode à appeler quand l'opération est terminée.
- stateObject
- Object
Objet défini par l'utilisateur qui comporte des informations sur l'opération. Cet objet est passé au délégué requestCallback
quand l'opération est terminée.
Retours
Instance de IAsyncResult qui fait référence à la demande asynchrone.
Exceptions
address
a la valeur null
.
Une erreur s'est produite lors de la résolution de address
.
address
est une adresse IP non valide.
Exemples
L’exemple de code suivant utilise la BeginGetHostEntry méthode pour résoudre une adresse IP en une IPHostEntry instance.
// Signals when the resolve has finished.
public:
static ManualResetEvent^ GetHostEntryFinished =
gcnew ManualResetEvent(false);
// define the state object for the callback.
// use hostName to correlate calls with the proper result.
ref class ResolveState
{
public:
String^ hostName;
IPHostEntry^ resolvedIPs;
ResolveState(String^ host)
{
hostName = host;
}
property IPHostEntry^ IPs
{
IPHostEntry^ get()
{
return resolvedIPs;
}
void set(IPHostEntry^ IPs)
{
resolvedIPs = IPs;
}
}
property String^ host
{
String^ get()
{
return hostName;
}
void set(String^ host)
{
hostName = host;
}
}
};
// Record the IPs in the state object for later use.
static void GetHostEntryCallback(IAsyncResult^ ar)
{
ResolveState^ ioContext = (ResolveState^)(ar->AsyncState);
ioContext->IPs = Dns::EndGetHostEntry(ar);
GetHostEntryFinished->Set();
}
// Determine the Internet Protocol(IP) addresses for this
// host asynchronously.
public:
static void DoGetHostEntryAsync(String^ hostName)
{
GetHostEntryFinished->Reset();
ResolveState^ ioContext = gcnew ResolveState(hostName);
Dns::BeginGetHostEntry(ioContext->host,
gcnew AsyncCallback(GetHostEntryCallback), ioContext);
// Wait here until the resolve completes
// (the callback calls .Set())
GetHostEntryFinished->WaitOne();
Console::WriteLine("EndGetHostEntry({0}) returns:", ioContext->host);
for (int i = 0; i < ioContext->IPs->AddressList->Length; i++)
{
Console::WriteLine(" {0}", ioContext->IPs->AddressList[i]->ToString());
}
// for each (IPAddress^ address in ioContext->IPs)
// {
// Console::WriteLine("{0} ", address);
// }
}
// Signals when the resolve has finished.
public static ManualResetEvent GetHostEntryFinished =
new ManualResetEvent(false);
// Define the state object for the callback.
// Use hostName to correlate calls with the proper result.
public class ResolveState
{
string hostName;
IPHostEntry resolvedIPs;
public ResolveState(string host)
{
hostName = host;
}
public IPHostEntry IPs
{
get { return resolvedIPs; }
set { resolvedIPs = value; }
}
public string host
{
get { return hostName; }
set { hostName = value; }
}
}
// Record the IPs in the state object for later use.
public static void GetHostEntryCallback(IAsyncResult ar)
{
ResolveState ioContext = (ResolveState)ar.AsyncState;
ioContext.IPs = Dns.EndGetHostEntry(ar);
GetHostEntryFinished.Set();
}
// Determine the Internet Protocol (IP) addresses for
// this host asynchronously.
public static void DoGetHostEntryAsync(string hostname)
{
GetHostEntryFinished.Reset();
ResolveState ioContext= new ResolveState(hostname);
Dns.BeginGetHostEntry(ioContext.host,
new AsyncCallback(GetHostEntryCallback), ioContext);
// Wait here until the resolve completes (the callback
// calls .Set())
GetHostEntryFinished.WaitOne();
Console.WriteLine("EndGetHostEntry({0}) returns:", ioContext.host);
foreach (IPAddress address in ioContext.IPs.AddressList)
{
Console.WriteLine($" {address}");
}
}
' Signals when the resolve has finished.
Dim Shared GetHostEntryFinished As ManualResetEvent = New ManualResetEvent(False)
' Define the state object for the callback.
' Use hostName to correlate calls with the proper result.
Class ResolveState
Dim hostName As String
Dim resolvedIPs As IPHostEntry
Public Sub New(host As String)
hostName = host
End Sub
Public Property IPs AS IPHostEntry
Get
Return resolvedIPs
End Get
Set
resolvedIPs = value
End Set
End Property
Public Property host As String
Get
Return hostName
End Get
Set
hostName = value
End Set
End Property
End Class
' Record the IPs in the state object for later use.
Shared Sub GetHostEntryCallback(ar As IAsyncResult)
Dim ioContext As ResolveState = ar.AsyncState
ioContext.IPs = Dns.EndGetHostEntry(ar)
GetHostEntryFinished.Set()
End Sub
' Determine the Internet Protocol (IP) addresses for
' this host asynchronously.
Shared Sub DoGetHostEntryAsync(hostname As String)
GetHostEntryFinished.Reset()
Dim ioContext As ResolveState = New ResolveState(hostname)
Dns.BeginGetHostEntry(ioContext.host,AddressOf GetHostEntryCallback, ioContext)
' Wait here until the resolve completes (the callback
' calls .Set())
GetHostEntryFinished.WaitOne()
Console.WriteLine($"EndGetHostEntry({ioContext.host}) returns:")
Dim addresses As IPAddress() = ioContext.IPs.AddressList
Dim index As Integer
For index = 0 To addresses.Length - 1
Console.WriteLine($" {addresses(index)}")
Next index
End Sub
Remarques
La BeginGetHostEntry méthode interroge de manière asynchrone un serveur DNS pour les adresses IP et les alias associés à une adresse IP.
Note Ce membre émet des informations de trace lorsque vous activez le suivi réseau dans votre application. Pour plus d’informations, consultez Suivi réseau dans le .NET Framework.
L’opération asynchrone BeginGetHostEntry doit être effectuée en appelant la EndGetHostEntry méthode . En règle générale, la méthode est appelée par le requestCallback
délégué.
Cette méthode ne se bloque pas tant que l’opération n’est pas terminée. Pour bloquer jusqu’à la fin de l’opération, utilisez la GetHostEntry méthode .
Pour plus d’informations sur l’utilisation du modèle de programmation asynchrone, consultez Appel de méthodes synchrones de manière asynchrone
S’applique à
BeginGetHostEntry(String, AsyncCallback, Object)
- Source:
- Dns.cs
- Source:
- Dns.cs
- Source:
- Dns.cs
Résout un nom d'hôte ou une adresse IP en instance de IPHostEntry de manière asynchrone.
public:
static IAsyncResult ^ BeginGetHostEntry(System::String ^ hostNameOrAddress, AsyncCallback ^ requestCallback, System::Object ^ stateObject);
public static IAsyncResult BeginGetHostEntry (string hostNameOrAddress, AsyncCallback? requestCallback, object? stateObject);
public static IAsyncResult BeginGetHostEntry (string hostNameOrAddress, AsyncCallback requestCallback, object stateObject);
static member BeginGetHostEntry : string * AsyncCallback * obj -> IAsyncResult
Public Shared Function BeginGetHostEntry (hostNameOrAddress As String, requestCallback As AsyncCallback, stateObject As Object) As IAsyncResult
Paramètres
- hostNameOrAddress
- String
Nom de l'hôte ou adresse IP à résoudre.
- requestCallback
- AsyncCallback
Délégué AsyncCallback qui fait référence à la méthode à appeler quand l'opération est terminée.
- stateObject
- Object
Objet défini par l'utilisateur qui comporte des informations sur l'opération. Cet objet est passé au délégué requestCallback
quand l'opération est terminée.
Retours
Instance de IAsyncResult qui fait référence à la demande asynchrone.
Exceptions
hostNameOrAddress
a la valeur null
.
La longueur de hostNameOrAddress
est supérieure à 255 caractères.
Une erreur s'est produite lors de la résolution de hostNameOrAddress
.
hostNameOrAddress
est une adresse IP non valide.
Exemples
L’exemple de code suivant utilise la BeginGetHostEntry méthode pour résoudre une adresse IP en une IPHostEntry instance.
// Signals when the resolve has finished.
public:
static ManualResetEvent^ GetHostEntryFinished =
gcnew ManualResetEvent(false);
// define the state object for the callback.
// use hostName to correlate calls with the proper result.
ref class ResolveState
{
public:
String^ hostName;
IPHostEntry^ resolvedIPs;
ResolveState(String^ host)
{
hostName = host;
}
property IPHostEntry^ IPs
{
IPHostEntry^ get()
{
return resolvedIPs;
}
void set(IPHostEntry^ IPs)
{
resolvedIPs = IPs;
}
}
property String^ host
{
String^ get()
{
return hostName;
}
void set(String^ host)
{
hostName = host;
}
}
};
// Record the IPs in the state object for later use.
static void GetHostEntryCallback(IAsyncResult^ ar)
{
ResolveState^ ioContext = (ResolveState^)(ar->AsyncState);
ioContext->IPs = Dns::EndGetHostEntry(ar);
GetHostEntryFinished->Set();
}
// Determine the Internet Protocol(IP) addresses for this
// host asynchronously.
public:
static void DoGetHostEntryAsync(String^ hostName)
{
GetHostEntryFinished->Reset();
ResolveState^ ioContext = gcnew ResolveState(hostName);
Dns::BeginGetHostEntry(ioContext->host,
gcnew AsyncCallback(GetHostEntryCallback), ioContext);
// Wait here until the resolve completes
// (the callback calls .Set())
GetHostEntryFinished->WaitOne();
Console::WriteLine("EndGetHostEntry({0}) returns:", ioContext->host);
for (int i = 0; i < ioContext->IPs->AddressList->Length; i++)
{
Console::WriteLine(" {0}", ioContext->IPs->AddressList[i]->ToString());
}
// for each (IPAddress^ address in ioContext->IPs)
// {
// Console::WriteLine("{0} ", address);
// }
}
// Signals when the resolve has finished.
public static ManualResetEvent GetHostEntryFinished =
new ManualResetEvent(false);
// Define the state object for the callback.
// Use hostName to correlate calls with the proper result.
public class ResolveState
{
string hostName;
IPHostEntry resolvedIPs;
public ResolveState(string host)
{
hostName = host;
}
public IPHostEntry IPs
{
get { return resolvedIPs; }
set { resolvedIPs = value; }
}
public string host
{
get { return hostName; }
set { hostName = value; }
}
}
// Record the IPs in the state object for later use.
public static void GetHostEntryCallback(IAsyncResult ar)
{
ResolveState ioContext = (ResolveState)ar.AsyncState;
ioContext.IPs = Dns.EndGetHostEntry(ar);
GetHostEntryFinished.Set();
}
// Determine the Internet Protocol (IP) addresses for
// this host asynchronously.
public static void DoGetHostEntryAsync(string hostname)
{
GetHostEntryFinished.Reset();
ResolveState ioContext= new ResolveState(hostname);
Dns.BeginGetHostEntry(ioContext.host,
new AsyncCallback(GetHostEntryCallback), ioContext);
// Wait here until the resolve completes (the callback
// calls .Set())
GetHostEntryFinished.WaitOne();
Console.WriteLine("EndGetHostEntry({0}) returns:", ioContext.host);
foreach (IPAddress address in ioContext.IPs.AddressList)
{
Console.WriteLine($" {address}");
}
}
' Signals when the resolve has finished.
Dim Shared GetHostEntryFinished As ManualResetEvent = New ManualResetEvent(False)
' Define the state object for the callback.
' Use hostName to correlate calls with the proper result.
Class ResolveState
Dim hostName As String
Dim resolvedIPs As IPHostEntry
Public Sub New(host As String)
hostName = host
End Sub
Public Property IPs AS IPHostEntry
Get
Return resolvedIPs
End Get
Set
resolvedIPs = value
End Set
End Property
Public Property host As String
Get
Return hostName
End Get
Set
hostName = value
End Set
End Property
End Class
' Record the IPs in the state object for later use.
Shared Sub GetHostEntryCallback(ar As IAsyncResult)
Dim ioContext As ResolveState = ar.AsyncState
ioContext.IPs = Dns.EndGetHostEntry(ar)
GetHostEntryFinished.Set()
End Sub
' Determine the Internet Protocol (IP) addresses for
' this host asynchronously.
Shared Sub DoGetHostEntryAsync(hostname As String)
GetHostEntryFinished.Reset()
Dim ioContext As ResolveState = New ResolveState(hostname)
Dns.BeginGetHostEntry(ioContext.host,AddressOf GetHostEntryCallback, ioContext)
' Wait here until the resolve completes (the callback
' calls .Set())
GetHostEntryFinished.WaitOne()
Console.WriteLine($"EndGetHostEntry({ioContext.host}) returns:")
Dim addresses As IPAddress() = ioContext.IPs.AddressList
Dim index As Integer
For index = 0 To addresses.Length - 1
Console.WriteLine($" {addresses(index)}")
Next index
End Sub
Remarques
La BeginGetHostEntry méthode interroge un serveur DNS à la recherche de l’adresse IP associée à un nom d’hôte ou à une adresse IP.
Note Ce membre émet des informations de trace lorsque vous activez le suivi réseau dans votre application. Pour plus d’informations, consultez Suivi réseau dans le .NET Framework.
L’opération asynchrone BeginGetHostEntry doit être effectuée en appelant la EndGetHostEntry méthode . En règle générale, la méthode est appelée par le requestCallback
délégué.
Cette méthode ne se bloque pas tant que l’opération n’est pas terminée. Pour bloquer jusqu’à la fin de l’opération, utilisez la GetHostEntry méthode .
Pour plus d’informations sur l’utilisation du modèle de programmation asynchrone, consultez Appel asynchrone de méthodes synchrones.