ServicePointManager.FindServicePoint 方法

定义

命名空间:

System.Net

程序集:

netstandard.dll, System.Net.Requests.dll

查找现有 ServicePoint 对象或创建一个新 ServicePoint 对象来管理此请求的通信。

重载

名称	说明
FindServicePoint(Uri, IWebProxy)	查找现有 ServicePoint 对象或创建一个新 ServicePoint 对象来管理与指定 Uri 对象的通信。
FindServicePoint(Uri)	查找现有 ServicePoint 对象或创建一个新 ServicePoint 对象来管理与指定 Uri 对象的通信。
FindServicePoint(String, IWebProxy)	查找现有 ServicePoint 对象或创建一个新 ServicePoint 对象，以管理与指定的统一资源标识符（URI）的通信。

FindServicePoint(Uri, IWebProxy)

Source:

ServicePointManager.cs

查找现有 ServicePoint 对象或创建一个新 ServicePoint 对象来管理与指定 Uri 对象的通信。

public:
 static System::Net::ServicePoint ^ FindServicePoint(Uri ^ address, System::Net::IWebProxy ^ proxy);

public static System.Net.ServicePoint FindServicePoint(Uri address, System.Net.IWebProxy? proxy);

static member FindServicePoint : Uri * System.Net.IWebProxy -> System.Net.ServicePoint

Public Shared Function FindServicePoint (address As Uri, proxy As IWebProxy) As ServicePoint

参数

address

Uri

包含 Uri 要联系的 Internet 资源的地址的对象。

proxy

IWebProxy

此请求的代理数据。

返回

ServicePoint

ServicePoint管理请求通信的对象。

例外

ArgumentNullException

address 是 null。

InvalidOperationException

已达到定义ServicePoint的最大对象数MaxServicePoints。

注解

该方法 FindServicePoint 返回 ServicePoint 与指定的 Internet 主机名关联的对象。 如果该主机不存在 ServicePoint 对象，该 ServicePointManager 对象将创建一个对象。

另请参阅

• ServicePoint

FindServicePoint(Uri)

Source:

ServicePointManager.cs

查找现有 ServicePoint 对象或创建一个新 ServicePoint 对象来管理与指定 Uri 对象的通信。

public:
 static System::Net::ServicePoint ^ FindServicePoint(Uri ^ address);

public static System.Net.ServicePoint FindServicePoint(Uri address);

static member FindServicePoint : Uri -> System.Net.ServicePoint

Public Shared Function FindServicePoint (address As Uri) As ServicePoint

参数

address

Uri

Uri要联系的 Internet 资源的对象。

返回

ServicePoint

ServicePoint管理请求通信的对象。

例外

ArgumentNullException

address 是 null。

InvalidOperationException

已达到定义ServicePoint的最大对象数MaxServicePoints。

注解

该方法 FindServicePoint 返回 ServicePoint 与指定的 Internet 主机名关联的对象。 如果该主机不存在 ServicePoint 对象，该 ServicePointManager 对象将创建一个对象。

另请参阅

• ServicePoint

FindServicePoint(String, IWebProxy)

Source:

ServicePointManager.cs

查找现有 ServicePoint 对象或创建一个新 ServicePoint 对象，以管理与指定的统一资源标识符（URI）的通信。

public:
 static System::Net::ServicePoint ^ FindServicePoint(System::String ^ uriString, System::Net::IWebProxy ^ proxy);

public static System.Net.ServicePoint FindServicePoint(string uriString, System.Net.IWebProxy? proxy);

static member FindServicePoint : string * System.Net.IWebProxy -> System.Net.ServicePoint

Public Shared Function FindServicePoint (uriString As String, proxy As IWebProxy) As ServicePoint

参数

uriString

String

要联系的 Internet 资源的 URI。

proxy

IWebProxy

此请求的代理数据。

返回

ServicePoint

ServicePoint管理请求通信的对象。

例外

UriFormatException

指定的 uriString URI 无效。

InvalidOperationException

已达到定义ServicePoint的最大对象数MaxServicePoints。

示例

下面的代码示例演示如何调用此方法以访问 ServicePoint 对象。

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)
    {
        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.
    WebRequest.DefaultWebProxy = DefaultProxy;

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

    // 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/");
}

' 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.
    WebRequest.DefaultWebProxy = DefaultProxy


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

    ' 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

注解

该方法 FindServicePoint 返回 ServicePoint 与指定的 Internet 主机名关联的对象。 如果该主机不存在 ServicePoint 对象，该 ServicePointManager 对象将创建一个对象。

另请参阅

• Uri
• ServicePoint