ServicePoint クラスとは？ わかりやすく解説

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ServicePoint クラス

HTTP 接続の接続管理を提供します。

名前空間: System.Net
アセンブリ: System (system.dll 内)
構文構文

Visual Basic (宣言)
Public Class ServicePoint
Visual Basic (使用法)
Dim instance As ServicePoint
C#
public class ServicePoint
C++
public ref class ServicePoint
J#
public class ServicePoint
JScript
public class ServicePoint
解説解説

ServicePoint クラスは、インターネット リソースの URI (Uniform Resource Identifier) で渡されたホスト情報に基づいて、そのリソースへの接続を処理します。リソースへの初期接続で、ServicePoint オブジェクトによって保持される情報が決定されます。この情報は、以降のそのリソースに対するすべての要求によって共有されます。

ServicePoint オブジェクトは、ServicePointManager クラスによって管理され、必要に応じて System.Net.ServicePointManager.FindServicePoint メソッドによって作成されます。作成できる ServicePoint オブジェクトの最大数は、ServicePointManager.MaxServicePoints プロパティで設定します。

各 ServicePoint オブジェクトは、アイドル時間が MaxIdleTime プロパティで指定された時間を超えるまで、インターネット リソースへの接続を維持します。ServicePoint は、MaxIdleTime 値を超過したら、別の接続で再利用できます。MaxIdleTime の既定値は、ServicePointManager.MaxServicePointIdleTime プロパティで設定します。

ConnectionLeaseTimeout プロパティが -1 以外の値に設定されている場合、指定した時間が経過すると、アクティブな ServicePoint 接続は、次の要求の処理後に閉じられます。これは、無制限に開いているアクティブな接続を必要としないアプリケーションに便利です。既定では、アクティブな接続は無制限に開いています。

メモメモ

負荷の高い状況では、一部のアプリケーションが ThreadPool 内のフリー スレッドを使い果たし、システムのパフォーマンスが低下することがあります (トランザクションの数が多い場合や変化する場合など)。この問題を解決するための構成変更については、http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnpag/html/scalenetchapt17.asp を参照してください。

使用例使用例

www.contoso.com という URI に接続する ServicePoint オブジェクトを作成するコード例を次に示します。

Visual Basic
' This example shows how to use the ServicePoint and ServicePointManager
 classes.
' The ServicePointManager class uses the ServicePoint class to manage
 connections
' to a remote host. The networking classes reuse service points for
 all 
' requests to a given URI. In fact, the same ServicePoint object 
' is used to issue requests to Internet resources identified by the
 same
' scheme identifier (for example,  HTTP) and host fragment (for example,
  www.contoso.com).  
' Reusing service points in this way can help improve application  performance.

Imports System
Imports System.Net
Imports System.Threading
Imports System.Text.RegularExpressions

Namespace Mssc.Services.ConnectionManagement
    Module M_TestServicePoint

        Class TestServicePoint
            Private Shared Sub
 ShowProperties(ByVal sp As ServicePoint)

                Console.WriteLine("Done calling FindServicePoint")

                ' Display the ServicePoint Internet resource address.
                Console.WriteLine(("Address = " +
 sp.Address.ToString()))

                ' Display the date and time that the ServicePoint was
 last 
                ' connected to a host.
                Console.WriteLine(("IdleSince = "
 + sp.IdleSince.ToString()))


                ' Display the maximum length of time that the ServicePoint
 instance 
                ' is allowed to maintain an idle connection to an Internet
  
                ' resource before it is recycled for use in another
 connection.
                Console.WriteLine(("MaxIdleTime = "
 + sp.MaxIdleTime.ToString()))

                Console.WriteLine(("ConnectionName = "
 + sp.ConnectionName))

                ' Display the maximum number of connections allowed
 on this 
                ' ServicePoint instance.
                Console.WriteLine(("ConnectionLimit = "
 + sp.ConnectionLimit.ToString()))

                ' Display the number of connections associated with
 this 
                ' ServicePoint instance.
                Console.WriteLine(("CurrentConnections = "
 + sp.CurrentConnections.ToString()))

                If sp.Certificate Is Nothing
 Then
                    Console.WriteLine("Certificate = (null)")
                Else
                    Console.WriteLine(("Certificate = "
 + sp.Certificate.ToString()))
                End If

                If sp.ClientCertificate Is
 Nothing Then
                    Console.WriteLine("ClientCertificate = (null)")
                Else
                    Console.WriteLine(("ClientCertificate = "
 + sp.ClientCertificate.ToString()))
                End If

                Console.WriteLine("ProtocolVersion = "
 + sp.ProtocolVersion.ToString())
                Console.WriteLine(("SupportsPipelining = "
 + sp.SupportsPipelining.ToString()))


                Console.WriteLine("UseNagleAlgorithm = "
 + sp.UseNagleAlgorithm.ToString())
                Console.WriteLine("Expect 100-continue = "
 + sp.Expect100Continue.ToString())
            End Sub 'ShowProperties





            Private Shared Sub
 makeWebRequest(ByVal hashCode As Integer,
 ByVal Uri As String)
                Dim res As HttpWebResponse
 = Nothing

                ' Make sure that the idle time has elapsed, so that
 a new 
                ' ServicePoint instance is created.
                Console.WriteLine("Sleeping for 2 sec.")
                Thread.Sleep(2000)

                Try
                    ' Create a request to the passed URI.
                    Dim req As HttpWebRequest
 = CType(WebRequest.Create(Uri), HttpWebRequest)
                    Console.WriteLine((ControlChars.Lf + "Connecting
 to " + Uri + " ............"))

                    ' Get the response object.
                    res = CType(req.GetResponse(), HttpWebResponse)
                    Console.WriteLine("Connected."
 + ControlChars.Lf)
                    Dim currentServicePoint As
 ServicePoint = req.ServicePoint

                    ' Display new service point properties.
                    Dim currentHashCode As
 Integer = currentServicePoint.GetHashCode()
                    Console.WriteLine(("New service point hashcode:
 " + currentHashCode.ToString()))
                    Console.WriteLine(("New service point max
 idle time: " + currentServicePoint.MaxIdleTime.ToString()))
                    Console.WriteLine(("New service point is idle
 since " + currentServicePoint.IdleSince.ToString()))

                    ' Check that a new ServicePoint instance has been
 created.
                    If hashCode = currentHashCode Then
                        Console.WriteLine("Service point reused.")
                    Else
                        Console.WriteLine("A new service point
 created.")
                    End If
                Catch e As Exception
                    Console.WriteLine(("Source : "
 + e.Source))
                    Console.WriteLine(("Message : "
 + e.Message))
                Finally
                    If Not (res Is
 Nothing) Then
                        res.Close()
                    End If
                End Try
            End Sub 'makeWebRequest


            ' Show the user how to use this program when wrong inputs
 are entered.
            Private Shared Sub
 showUsage()
                Console.WriteLine("Enter the proxy name as follows:")
                Console.WriteLine(ControlChars.Tab + "vb_servicepoint
 proxyName")
            End Sub 'showusage

            ' This is the program entry point. It allows the user to
 enter 
            ' a server name that is used to locate its current homepage.
            Public Shared Sub
 Main(ByVal args() As String)
                Dim proxy As String
 = Nothing
                Dim port As Integer
 = 80

                ' Define a regular expression to parse the user's input.
                ' This is a security check. It allows only
                ' alphanumeric input strings between 2 to 40 characters
 long.
                Dim rex As New
 Regex("^[a-zA-Z]\w{1,39}$")

                If args.Length = 0 Then
                    ' Show how to use this program.
                    showUsage()
                    Return
                End If

                proxy = args(0)
                If (Not (rex.Match(proxy)).Success)
 Then
                    Console.WriteLine("Input string format not
 allowed.")
                    Return
                End If

                ' Create a proxy object.  
                Dim proxyAdd As String
                proxyAdd = "http://" + proxy + ":"
 + port.ToString()


                Dim DefaultProxy As New
 WebProxy(proxyAdd, True)

                ' Set the proxy that all HttpWebRequest instances use.
                GlobalProxySelection.Select = DefaultProxy

                ' Get the base interface for proxy access for the 
                ' WebRequest-based classes.
                Dim Iproxy As IWebProxy = GlobalProxySelection.Select

                ' Set the maximum number of ServicePoint instances to
 maintain.
                ' Note that, if a ServicePoint instance for that host
 already 
                ' exists when your application requests a connection
 to
                ' an Internet resource, the ServicePointManager object
                ' returns this existing ServicePoint. If none exists
 
                ' for that host, it creates a new ServicePoint instance.
                ServicePointManager.MaxServicePoints = 4

                ' Set the maximum idle time of a ServicePoint instance
 to 10 seconds.
                ' After the idle time expires, the ServicePoint object
 is eligible for
                ' garbage collection and cannot be used by the ServicePointManager.
                ServicePointManager.MaxServicePointIdleTime = 10000


                ServicePointManager.UseNagleAlgorithm = True
                ServicePointManager.Expect100Continue = True
                ServicePointManager.CheckCertificateRevocationList = True
                ServicePointManager.DefaultConnectionLimit = _
                    ServicePointManager.DefaultPersistentConnectionLimit
                ' Create the Uri object for the resource you want to
 access.
                Dim MS As New
 Uri("http://msdn.microsoft.com/")

                ' Use the FindServicePoint method to find an existing
 
                ' ServicePoint object or to create a new one.   
                Dim servicePoint As ServicePoint
 = ServicePointManager.FindServicePoint(MS, Iproxy)
                ShowProperties(servicePoint)
                Dim hashCode As Integer
 = servicePoint.GetHashCode()
                Console.WriteLine(("Service point hashcode: "
 + hashCode.ToString()))

                ' Make a request with the same scheme identifier and
 host fragment
                ' used to create the previous ServicePoint object.
                makeWebRequest(hashCode, "http://msdn.microsoft.com/library/")

            End Sub 'Main


        End Class 'TestServicePoint

    End Module
End Namespace
C#
// This example shows how to use the ServicePoint and ServicePointManager
 classes.
// The ServicePointManager class uses the ServicePoint class to manage
 connections
// to a remote host. The networking classes reuse service points for
 all 
// requests to a given URI. In fact, the same ServicePoint object 
// is used to issue requests to Internet resources identified by the
 same
// scheme identifier (for example,  HTTP) and host fragment (for example,
  www.contoso.com).  
// This should improve your application performance. 
// Reusing service points in this way can help improve application performance.
using System;
using System.Net;
using System.Threading;
using System.Text.RegularExpressions;

namespace Mssc.Services.ConnectionManagement
{
    class TestServicePoint
    {
        private static void
 ShowProperties (ServicePoint sp)
        {
            Console.WriteLine ("Done calling FindServicePoint()...");

            // Display the ServicePoint Internet resource address.
            Console.WriteLine ("Address = {0} ", sp.Address.ToString ());

            // Display the date and time that the ServicePoint was last
 
            // connected to a host.
            Console.WriteLine ("IdleSince = " + sp.IdleSince.ToString ());

            // Display the maximum length of time that the ServicePoint
 instance  
            // is allowed to maintain an idle connection to an Internet
  
            // resource before it is recycled for use in another connection.
            Console.WriteLine ("MaxIdleTime = " + sp.MaxIdleTime);

            Console.WriteLine ("ConnectionName = " + sp.ConnectionName);

            // Display the maximum number of connections allowed on
 this 
            // ServicePoint instance.
            Console.WriteLine ("ConnectionLimit = " + sp.ConnectionLimit);

            // Display the number of connections associated with this
 
            // ServicePoint instance.
            Console.WriteLine ("CurrentConnections = " + sp.CurrentConnections);

            if (sp.Certificate == null)
                Console.WriteLine ("Certificate = (null)");
            else
                Console.WriteLine ("Certificate = " + sp.Certificate.ToString
 ());

            if (sp.ClientCertificate == null)
                Console.WriteLine ("ClientCertificate = (null)");
            else
                Console. WriteLine ("ClientCertificate = " + sp.ClientCertificate.ToString
 ());

            Console.WriteLine ("ProtocolVersion = " + sp.ProtocolVersion.ToString
 ());
            Console.WriteLine ("SupportsPipelining = " + sp.SupportsPipelining);

            Console.WriteLine ("UseNagleAlgorithm = " + sp.UseNagleAlgorithm.ToString
 ());
            Console.WriteLine ("Expect 100-continue = " + sp.Expect100Continue.ToString
 ());
        }

        private static void
 makeWebRequest (int hashCode, string Uri)
        {
            HttpWebResponse res = null;

            // Make sure that the idle time has elapsed, so that a new
 
            // ServicePoint instance is created.
            Console.WriteLine ("Sleeping for 2 sec.");
            Thread.Sleep (2000);
            try
            {
                // Create a request to the passed URI.
                HttpWebRequest req = (HttpWebRequest)WebRequest.Create (Uri);

                Console.WriteLine ("\nConnecting to " + Uri + " ............");

                // Get the response object.
                res = (HttpWebResponse)req.GetResponse ();
                Console.WriteLine ("Connected.\n");

                ServicePoint currentServicePoint = req.ServicePoint;

                // Display new service point properties.
                int currentHashCode = currentServicePoint.GetHashCode
 ();

                Console.WriteLine ("New service point hashcode: " + currentHashCode);
                Console.WriteLine ("New service point max idle time: "
 + currentServicePoint.MaxIdleTime);
                Console.WriteLine ("New service point is idle since " +
 currentServicePoint.IdleSince );

                // Check that a new ServicePoint instance has been created.
                if (hashCode == currentHashCode)
                    Console.WriteLine ("Service point reused.");
                else
                    Console.WriteLine ("A new service point
 created.") ;
            }
            catch (Exception e)
            {
                Console.WriteLine ("Source : " + e.Source);
                Console.WriteLine ("Message : " + e.Message);
            }
            finally
            {
                if (res != null)
                    res.Close ();
            }
        }

        // Show the user how to use this program when wrong inputs are
 entered.
        private static void
 showUsage ()
        {
            Console.WriteLine ("Enter the proxy name as follows:");
            Console.WriteLine ("\tcs_servicepoint proxyName");
        }

        public static void
 Main (string[] args)
        {
            int port = 80;

            // Define a regular expression to parse the user's input.
            // This is a security check. It allows only
            // alphanumeric input strings between 2 to 40 characters
 long.
            Regex rex = new Regex (@"^[a-zA-Z]\w{1,39}$");

            if (args.Length < 1)
            {
                showUsage ();
                return;
            }
            string proxy = args[0];

            if ((rex.Match (proxy)).Success != true)
            {
                Console.WriteLine ("Input string format not
 allowed.");
                return;
            }
            string proxyAdd = "http://"
 + proxy + ":" + port;

            // Create a proxy object.  
            WebProxy DefaultProxy = new WebProxy (proxyAdd, true);

            // Set the proxy that all HttpWebRequest instances use.
            GlobalProxySelection.Select = DefaultProxy;

            // Get the base interface for proxy access for the 
            // WebRequest-based classes.
            IWebProxy Iproxy = GlobalProxySelection.Select;

            // Set the maximum number of ServicePoint instances to 
            // maintain. If a ServicePoint instance for that host already
 
            // exists when your application requests a connection to
            // an Internet resource, the ServicePointManager object
            // returns this existing ServicePoint instance. If none
 exists 
            // for that host, it creates a new ServicePoint instance.
            ServicePointManager.MaxServicePoints = 4;

            // Set the maximum idle time of a ServicePoint instance
 to 10 seconds.
            // After the idle time expires, the ServicePoint object
 is eligible for
            // garbage collection and cannot be used by the ServicePointManager
 object.
            ServicePointManager.MaxServicePointIdleTime = 10000;



            ServicePointManager.UseNagleAlgorithm = true;
            ServicePointManager.Expect100Continue = true;
            ServicePointManager.CheckCertificateRevocationList = true;
            ServicePointManager.DefaultConnectionLimit = ServicePointManager.DefaultPersistentConnectionLimit;
            // Create the Uri object for the resource you want to access.
            Uri MS = new Uri ("http://msdn.microsoft.com/");

            // Use the FindServicePoint method to find an existing 
            // ServicePoint object or to create a new one.  
            ServicePoint servicePoint = ServicePointManager.FindServicePoint (MS,
 Iproxy);

            ShowProperties (servicePoint);

            int hashCode = servicePoint.GetHashCode ();

            Console.WriteLine ("Service point hashcode: " + hashCode);

            // Make a request with the same scheme identifier and host
 fragment
            // used to create the previous ServicePoint object.
            makeWebRequest (hashCode, "http://msdn.microsoft.com/library/");
        

            
        }

    }
}
C++
// This example shows how to use the ServicePoint and ServicePointManager
 classes.
// The ServicePointManager class uses the ServicePoint class to manage
 connections
// to a remote host. The networking classes reuse service points for
 all 
// requests to a given URI. In fact, the same ServicePoint object 
// is used to issue requests to Internet resources identified by the
 same
// scheme identifier (for example,  HTTP) and host fragment (for example,
  www.contoso.com).  
// This should improve your application performance. 
// Reusing service points in this way can help improve application performance.
#using <System.dll>

using namespace System;
using namespace System::Net;
using namespace System::Threading;
using namespace System::Text::RegularExpressions;
void ShowProperties( ServicePoint^ sp )
{
   Console::WriteLine( "Done calling FindServicePoint()..." );
   
   // Display the ServicePoint Internet resource address.
   Console::WriteLine( "Address = {0}", sp->Address );
   
   // Display the date and time that the ServicePoint was last 
   // connected to a host.
   Console::WriteLine( "IdleSince = {0}", sp->IdleSince );
   
   // Display the maximum length of time that the ServicePoint instance
  
   // is allowed to maintain an idle connection to an Internet  
   // resource before it is recycled for use in another connection.
   Console::WriteLine( "MaxIdleTime = {0}", sp->MaxIdleTime );
   
   Console::WriteLine( "ConnectionName = {0}", sp->ConnectionName );
   
   // Display the maximum number of connections allowed on this 
   // ServicePoint instance.
   Console::WriteLine( "ConnectionLimit = {0}", sp->ConnectionLimit
 );
   
   // Display the number of connections associated with this 
   // ServicePoint instance.
   Console::WriteLine( "CurrentConnections = {0}", sp->CurrentConnections
 );
   
   if ( sp->Certificate == nullptr )
      Console::WriteLine( "Certificate = (null)" );
   else
      Console::WriteLine( "Certificate = {0}", sp->Certificate );

   if ( sp->ClientCertificate == nullptr )
      Console::WriteLine( "Client Certificate = (null)"
 );
   else
      Console::WriteLine( "Client Certificate = {0}", sp->ClientCertificate
 );

   Console::WriteLine( "ProtocolVersion = {0}", sp->ProtocolVersion->ToString()
 );
   Console::WriteLine( "SupportsPipelining = {0}", sp->SupportsPipelining
 );
   
   Console::WriteLine( "UseNagleAlgorithm = {0} ", sp->UseNagleAlgorithm.ToString()
 );
   Console::WriteLine( "Expect 100-continue = {0}", sp->Expect100Continue.ToString()
 );
   
}


void makeWebRequest( int hashCode, String^
 Uri )
{
   HttpWebResponse^ res = nullptr;
   
   // Make sure that the idle time has elapsed, so that a new 
   // ServicePoint instance is created.
   Console::WriteLine( "Sleeping for 2 sec." );
   Thread::Sleep( 2000 );
   try
   {
      
      // Create a request to the passed URI.
      HttpWebRequest^ req = dynamic_cast<HttpWebRequest^>(WebRequest::Create(
 Uri ));
      Console::WriteLine( "\nConnecting to {0} ............", Uri );
      
      // Get the response object.
      res = dynamic_cast<HttpWebResponse^>(req->GetResponse());
      Console::WriteLine( "Connected.\n" );
      ServicePoint^ currentServicePoint = req->ServicePoint;
      
      // Display new service point properties.
      int currentHashCode = currentServicePoint->GetHashCode();
      Console::WriteLine( "New service point hashcode: {0}", currentHashCode
 );
      Console::WriteLine( "New service point max idle time: {0}", currentServicePoint->MaxIdleTime
 );
      Console::WriteLine( "New service point is idle since {0}", currentServicePoint->IdleSince
 );
      
      // Check that a new ServicePoint instance has been created.
      if ( hashCode == currentHashCode )
            Console::WriteLine( "Service point reused." );
      else
            Console::WriteLine( "A new service point created."
 );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "Source : {0}", e->Source );
      Console::WriteLine( "Message : {0}", e->Message );
   }
   finally
   {
      if ( res != nullptr )
            res->Close();
   }

}


// Show the user how to use this program when wrong inputs are entered.
void showUsage()
{
   Console::WriteLine( "Enter the proxy name as follows:" );
   Console::WriteLine( "\tcs_servicepoint proxyName" );
}


int main()
{
   array<String^>^args = Environment::GetCommandLineArgs();
   int port = 80;
   
   // Define a regular expression to parse the user's input.
   // This is a security check. It allows only
   // alphanumeric input strings between 2 to 40 characters long.
   Regex^ rex = gcnew Regex( "^[a-zA-Z]\\w{1,39}$" );
   if ( args->Length < 2 )
   {
      showUsage();
      return  -1;
   }

   String^ proxy = args[ 1 ];
   if ( (rex->Match(proxy))->Success != true
 )
   {
      Console::WriteLine( "Input string format not allowed."
 );
      return  -1;
   }

   String^ proxyAdd = String::Format( "http://{0}:{1}", proxy,
 port );
   
   // Create a proxy object.  
   WebProxy^ DefaultProxy = gcnew WebProxy( proxyAdd,true );
   
   // Set the proxy that all HttpWebRequest instances use.
   GlobalProxySelection::Select = DefaultProxy;
   
   // Get the base interface for proxy access for the 
   // WebRequest-based classes.
   IWebProxy^ Iproxy = GlobalProxySelection::Select;
   
   // Set the maximum number of ServicePoint instances to 
   // maintain. If a ServicePoint instance for that host already 
   // exists when your application requests a connection to
   // an Internet resource, the ServicePointManager object
   // returns this existing ServicePoint instance. If none exists 
   // for that host, it creates a new ServicePoint instance.
   ServicePointManager::MaxServicePoints = 4;
   
   // Set the maximum idle time of a ServicePoint instance to 10 seconds.
   // After the idle time expires, the ServicePoint object is eligible
 for
   // garbage collection and cannot be used by the ServicePointManager.
   ServicePointManager::MaxServicePointIdleTime = 10000;
   
   ServicePointManager::UseNagleAlgorithm = true;
   ServicePointManager::Expect100Continue = true;
   ServicePointManager::CheckCertificateRevocationList = true;
   ServicePointManager::DefaultConnectionLimit = ServicePointManager::DefaultPersistentConnectionLimit;
   
   // Create the Uri object for the resource you want to access.
   Uri^ MS = gcnew Uri( "http://msdn.microsoft.com/" );
   
   // Use the FindServicePoint method to find an existing 
   // ServicePoint object or to create a new one.   
   ServicePoint^ servicePoint = ServicePointManager::FindServicePoint( MS, Iproxy
 );
   ShowProperties( servicePoint );
   int hashCode = servicePoint->GetHashCode();
   Console::WriteLine( "Service point hashcode: {0}", hashCode );
   
   // Make a request with the same scheme identifier and host fragment
   // used to create the previous ServicePoint object.
   makeWebRequest( hashCode, "http://msdn.microsoft.com/library/"
 );
}
J#
package Mssc.Services.ConnectionManagement ; 
// This example shows how to use the ServicePoint and ServicePointManager
 
// classes. The ServicePointManager class uses the ServicePoint class
 to 
// manage connections to a remote host. The networking classes reuse
 service
// points for all requests to a given URI. In fact, the same ServicePoint
 
// object is used to issue requests to Internet resources identified
 by the 
// same scheme identifier (for example,  HTTP) and host fragment (for
 example,
// www.contoso.com).
// This should improve your application performance. 
// Reusing service points in this way can help improve application performance.
import System.*;
import System.Net.*;
import System.Threading.*;
import System.Text.RegularExpressions.*;

class TestServicePoint
{
    private static void
 ShowProperties(ServicePoint sp)
    {
        Console.WriteLine("Done calling FindServicePoint()...");
        // Display the ServicePoint Internet resource address.
        Console.WriteLine("Address = {0} ", sp.get_Address().ToString());

        // Display the date and time that the ServicePoint was last
 
        // connected to a host.
        Console.WriteLine(("IdleSince = " + sp.get_IdleSince().ToString()));

        // Display the maximum length of time that the ServicePoint instance
  
        // is allowed to maintain an idle connection to an Internet
  
        // resource before it is recycled for use in another connection.
        Console.WriteLine(("MaxIdleTime = " + sp.get_MaxIdleTime()));

        Console.WriteLine(("ConnectionName = " + sp.get_ConnectionName()));

        // Display the maximum number of connections allowed on this
 
        // ServicePoint instance.
        Console.WriteLine(("ConnectionLimit = " + sp.get_ConnectionLimit()));

        // Display the number of connections associated with this 
        // ServicePoint instance.
        Console.WriteLine(("CurrentConnections = " 
            + sp.get_CurrentConnections()));

        if (sp.get_Certificate() == null) {
            Console.WriteLine("Certificate = (null)");
        }
        else {
            Console.WriteLine(("Certificate = " 
                + sp.get_Certificate().ToString()));
        }

        if (sp.get_ClientCertificate() == null)
 {
            Console.WriteLine("ClientCertificate = (null)");
        }
        else {
            Console.WriteLine(("ClientCertificate = " 
                + sp.get_ClientCertificate().ToString()));
        }
        Console.WriteLine(("ProtocolVersion = " 
            + sp.get_ProtocolVersion().ToString()));
        Console.WriteLine(("SupportsPipelining = " 
            + sp.get_SupportsPipelining()));

        Console.WriteLine(("UseNagleAlgorithm = " 
            + System.Convert.ToString(sp.get_UseNagleAlgorithm())));
        Console.WriteLine(("Expect 100-continue = " 
            + System.Convert.ToString(sp.get_Expect100Continue())));
    } //ShowProperties

    private static void
 MakeWebRequest(int hashCode, String uri) 
        throws InterruptedException
    {
        HttpWebResponse res = null;

        // Make sure that the idle time has elapsed, so that a new 
        // ServicePoint instance is created.
        Console.WriteLine("Sleeping for 2 sec.");
        Thread.sleep(2000);
        try {
            // Create a request to the passed URI.
            HttpWebRequest req = ((HttpWebRequest)(WebRequest.Create(uri)));
            Console.WriteLine(("\nConnecting to " + uri + " ............"));
            // Get the response object.
            res = ((HttpWebResponse)(req.GetResponse()));
            Console.WriteLine("Connected.\n");
            ServicePoint currentServicePoint = req.get_ServicePoint();

            // Display new service point properties.
            int currentHashCode = currentServicePoint.GetHashCode();

            Console.WriteLine(("New service point hashcode: " 
                + currentHashCode));
            Console.WriteLine(("New service point max idle time: " 
                + currentServicePoint.get_MaxIdleTime()));
            Console.WriteLine(("New service point is idle since " 
                + currentServicePoint.get_IdleSince()));

            // Check that a new ServicePoint instance has been created.
            if (hashCode == currentHashCode) {
                Console.WriteLine("Service point reused.");
            }
            else {
                Console.WriteLine("A new service point created.");
            }
        }
        catch (System.Exception e) {
            Console.WriteLine(("Source : " + e.get_Source()));
            Console.WriteLine(("Message : " + e.get_Message()));
        }
        finally {
            if ( res  != null  ) {
               res.Close();
            }
         }
    } //MakeWebRequest

    // Show the user how to use this program when wrong inputs are entered.
    private static void
 ShowUsage()
    {
        Console.WriteLine("Enter the proxy name as follows:");
        Console.WriteLine("\tcs_servicepoint proxyName");
    } //ShowUsage

    public static void main(String[]
 args) throws InterruptedException
    {
        int port = 80;

        // Define a regular expression to parse the user's input.
        // This is a security check. It allows only
        // alphanumeric input strings between 2 to 40 characters long.
        Regex rex = new Regex("^[a-zA-Z]\\w{1,39}$");
        if (args.length < 1) {
            ShowUsage();
            return;
        }

        String proxy = args[0];

        if (rex.Match(proxy).get_Success() != true)
 {
            Console.WriteLine("Input string format not allowed.");
            return;
        }
        String proxyAdd = "http://" + proxy + ":"
 + port;

        // Create a proxy object.  
        WebProxy defaultProxy = new WebProxy(proxyAdd, true);

        // Set the proxy that all HttpWebRequest instances use.
        GlobalProxySelection.set_Select(defaultProxy);

        // Get the base interface for proxy access for the 
        // WebRequest-based classes.
        IWebProxy iProxy = GlobalProxySelection.get_Select();

        // Set the maximum number of ServicePoint instances to 
        // maintain. If a ServicePoint instance for that host already
 
        // exists when your application requests a connection to
        // an Internet resource, the ServicePointManager object
        // returns this existing ServicePoint instance. If none exists
 
        // for that host, it creates a new ServicePoint instance.
        ServicePointManager.set_MaxServicePoints(4);

        // Set the maximum idle time of a ServicePoint instance to 10
 seconds.
        // After the idle time expires, the ServicePoint object is eligible
 
        // for garbage collection and cannot be used by the ServicePointManager
        // object.
        ServicePointManager.set_MaxServicePointIdleTime(10000);

        ServicePointManager.set_UseNagleAlgorithm(true);
        ServicePointManager.set_Expect100Continue(true);
        ServicePointManager.set_CheckCertificateRevocationList(true);
        ServicePointManager.set_DefaultConnectionLimit(
            ServicePointManager.DefaultPersistentConnectionLimit);

        // Create the Uri object for the resource you want to access.
        Uri ms = new Uri("http://msdn.microsoft.com/");

        // Use the FindServicePoint method to find an existing 
        // ServicePoint object or to create a new one.  
        ServicePoint servicePoint = 
            ServicePointManager.FindServicePoint(ms, iProxy);
        ShowProperties(servicePoint);
        int hashCode = servicePoint.GetHashCode();
        Console.WriteLine(("Service point hashcode: " + hashCode));

        // Make a request with the same scheme identifier and host fragment
        // used to create the previous ServicePoint object.
        MakeWebRequest(hashCode, "http://msdn.microsoft.com/library/");
    } //main 
} //TestServicePoint
継承階層継承階層
System.Object
  System.Net.ServicePoint
スレッド セーフスレッド セーフ
この型の public static (Visual Basic では Shared) メンバはすべて、スレッド セーフです。インスタンス メンバの場合は、スレッド セーフであるとは限りません。
プラットフォームプラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報バージョン情報
.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0、1.0
参照参照
関連項目
ServicePoint メンバ
System.Net 名前空間

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「ServicePoint クラス」の関連用語

1
ServicePointManager.FindServicePoint メソッド
.NET Framework クラス ライブラリ リファレンス
94% |||||

2
SmtpClient.ServicePoint プロパティ
.NET Framework クラス ライブラリ リファレンス
94% |||||

3
ServicePoint プロパティ
.NET Framework クラス ライブラリ リファレンス
92% |||||

4
ServicePointManager.MaxServicePointIdleTime プロパティ
.NET Framework クラス ライブラリ リファレンス
92% |||||

5
ServicePointManager.MaxServicePoints プロパティ
.NET Framework クラス ライブラリ リファレンス
92% |||||

6
FtpWebRequest.ServicePoint プロパティ
.NET Framework クラス ライブラリ リファレンス
92% |||||

7
ServicePoint.ConnectionLimit プロパティ
.NET Framework クラス ライブラリ リファレンス
76% |||||

8
ServicePoint.Address プロパティ
.NET Framework クラス ライブラリ リファレンス
74% |||||

9
ServicePoint.CurrentConnections プロパティ
.NET Framework クラス ライブラリ リファレンス
74% |||||

10
ServicePoint.IdleSince プロパティ
.NET Framework クラス ライブラリ リファレンス
74% |||||

ServicePoint クラスのお隣キーワード

Service.Ports プロパティ

ServicePoint クラス

ServicePoint プロパティ

ServicePoint メソッド

ServicePoint メンバ

ServicePoint.MaxIdleTime プロパティ

ServicePoint.ProtocolVersion プロパティ

ServicePoint.ReceiveBufferSize プロパティ

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