Dns.Resolve(String) 方法

定義

命名空間:

System.Net

組件:

System.Net.NameResolution.dll

來源:

Dns.cs

警告

Resolve has been deprecated. Use GetHostEntry instead.

解析 DNS 主機名稱或 IP 位址至 IPHostEntry 執行個體。

public:
 static System::Net::IPHostEntry ^ Resolve(System::String ^ hostName);

[System.Obsolete("Resolve has been deprecated. Use GetHostEntry instead.")]
public static System.Net.IPHostEntry Resolve (string hostName);

[<System.Obsolete("Resolve has been deprecated. Use GetHostEntry instead.")>]
static member Resolve : string -> System.Net.IPHostEntry

Public Shared Function Resolve (hostName As String) As IPHostEntry

參數

hostName

String

DNS 式網域名稱或 IP 位址。

傳回

IPHostEntry

IPHostEntry 執行個體，含有在 hostName 中所指定之主機的相關位址資訊。

屬性

ObsoleteAttribute

例外狀況

ArgumentNullException

hostName 為 null。

ArgumentOutOfRangeException

hostName 的長度大於 255 個字元。

SocketException

當解析 hostName 時，發生錯誤。

範例

下列範例會 Resolve 使用 方法將IP位址解析為 IPHostEntry 實例。

try
{
   IPHostEntry^ hostInfo = Dns::Resolve( hostString );
   
   // Get the IP address list that resolves to the host names contained in the
   // Alias property.
   array<IPAddress^>^address = hostInfo->AddressList;
   
   // Get the alias names of the addresses in the IP address list.
   array<String^>^alias = hostInfo->Aliases;
   Console::WriteLine( "Host name : {0}", hostInfo->HostName );
   Console::WriteLine( "\nAliases : " );
   for ( int index = 0; index < alias->Length; index++ )
   {
      Console::WriteLine( alias[ index ] );

   }
   Console::WriteLine( "\nIP Address list :" );
   for ( int index = 0; index < address->Length; index++ )
   {
      Console::WriteLine( address[ index ] );

   }
}
catch ( SocketException^ e ) 
{
   Console::WriteLine( "SocketException caught!!!" );
   Console::WriteLine( "Source : {0}", e->Source );
   Console::WriteLine( "Message : {0}", e->Message );
}
catch ( ArgumentNullException^ e ) 
{
   Console::WriteLine( "ArgumentNullException caught!!!" );
   Console::WriteLine( "Source : {0}", e->Source );
   Console::WriteLine( "Message : {0}", e->Message );
}
catch ( NullReferenceException^ e ) 
{
   Console::WriteLine( "NullReferenceException caught!!!" );
   Console::WriteLine( "Source : {0}", e->Source );
   Console::WriteLine( "Message : {0}", e->Message );
}
catch ( Exception^ e ) 
{
   Console::WriteLine( "Exception caught!!!" );
   Console::WriteLine( "Source : {0}", e->Source );
   Console::WriteLine( "Message : {0}", e->Message );
}

try {
    IPHostEntry hostInfo = Dns.Resolve(hostString);
    // Get the IP address list that resolves to the host names contained in the
    // Alias property.
    IPAddress[] address = hostInfo.AddressList;
    // Get the alias names of the addresses in the IP address list.
    String[] alias = hostInfo.Aliases;

    Console.WriteLine("Host name : " + hostInfo.HostName);
    Console.WriteLine("\nAliases : ");
    for(int index=0; index < alias.Length; index++) {
      Console.WriteLine(alias[index]);
    }
    Console.WriteLine("\nIP Address list :");
    for(int index=0; index < address.Length; index++) {
       Console.WriteLine(address[index]);
    }
 }
 catch(SocketException e)
 {
    Console.WriteLine("SocketException caught!!!");
    Console.WriteLine("Source : " + e.Source);
    Console.WriteLine("Message : " + e.Message);
 }
 catch(ArgumentNullException e)
 {
Console.WriteLine("ArgumentNullException caught!!!");
    Console.WriteLine("Source : " + e.Source);
    Console.WriteLine("Message : " + e.Message);
 }
 catch(NullReferenceException e)
 {
     Console.WriteLine("NullReferenceException caught!!!");
     Console.WriteLine("Source : " + e.Source);
     Console.WriteLine("Message : " + e.Message);
 }
 catch(Exception e)
 {
     Console.WriteLine("Exception caught!!!");
     Console.WriteLine("Source : " + e.Source);
     Console.WriteLine("Message : " + e.Message);
 }

Try
    ' Call the Resolve method passing a DNS style host name or an IP address in 
    ' dotted-quad notation (for example, "www.contoso.com" or "207.46.131.199") to 
    ' obtain an IPHostEntry instance that contains address information for the 
    ' specified host.
    Dim hostInfo As IPHostEntry = Dns.Resolve(hostString)
    ' Get the IP address list that resolves to the host names contained in the Alias 
    ' property.
    Dim address As IPAddress() = hostInfo.AddressList
    ' Get the alias names of the addresses in the IP address list.
    Dim [alias] As [String]() = hostInfo.Aliases

    Console.WriteLine(("Host name : " + hostInfo.HostName))
    Console.WriteLine(ControlChars.Cr + "Aliases : ")
    Dim index As Integer
    For index = 0 To [alias].Length - 1
        Console.WriteLine([alias](index))
    Next index
    Console.WriteLine(ControlChars.Cr + "IP Address list :")

    For index = 0 To address.Length - 1
        Console.WriteLine(address(index))
    Next index
Catch e As SocketException
    Console.WriteLine("SocketException caught!!!")
    Console.WriteLine(("Source : " + e.Source))
    Console.WriteLine(("Message : " + e.Message))
Catch e As ArgumentNullException
    Console.WriteLine("ArgumentNullException caught!!!")
    Console.WriteLine(("Source : " + e.Source))
    Console.WriteLine(("Message : " + e.Message))
Catch e As NullReferenceException
    Console.WriteLine("NullReferenceException caught!!!")
    Console.WriteLine(("Source : " + e.Source))
    Console.WriteLine(("Message : " + e.Message))
Catch e As Exception
    Console.WriteLine("Exception caught!!!")
    Console.WriteLine(("Source : " + e.Source))
    Console.WriteLine(("Message : " + e.Message))
End Try

備註

方法 Resolve 會查詢 DNS 伺服器，以取得與主機名或 IP 位址相關聯的 IP 位址。

當 hostName 是與多個IP位址相關聯的 DNS 樣式主機名時，只會傳回解析為該主機名的第一個IP位址。

Ipv6Element.Enabled如果 屬性設定為 true，則Aliases傳回之實例的 IPHostEntry 屬性不會由這個方法填入，而且一律為空白。

注意

當您在應用程式中啟用網路追蹤時，此成員會發出追蹤資訊。 如需詳細資訊，請參閱 .NET Framework 中的網路追蹤。