ServicePointManager.EnableDnsRoundRobin 属性

定义

命名空间:

System.Net

程序集:

System.Net.ServicePoint.dll

Source:

ServicePointManager.cs

获取或设置一个值，该值指示域名服务 (DNS) 解析是否在多个适用的 Internet 协议 (IP) 地址之间轮流进行。

public:
 static property bool EnableDnsRoundRobin { bool get(); void set(bool value); };

public static bool EnableDnsRoundRobin { get; set; }

static member EnableDnsRoundRobin : bool with get, set

Public Shared Property EnableDnsRoundRobin As Boolean

属性值

Boolean

如果 DNS 解析总是返回特定主机的第一个 IP 地址，则为 false；否则，为 true。 默认值为 false。

示例

下面的代码示例设置此属性。

ServicePointManager::UseNagleAlgorithm = true;
ServicePointManager::Expect100Continue = true;
ServicePointManager::CheckCertificateRevocationList = true;
ServicePointManager::DefaultConnectionLimit =
    ServicePointManager::DefaultPersistentConnectionLimit;
ServicePointManager::EnableDnsRoundRobin = true;
ServicePointManager::DnsRefreshTimeout = 4*60*1000; // 4 minutes

ServicePointManager.UseNagleAlgorithm = true;
ServicePointManager.Expect100Continue = true;
ServicePointManager.CheckCertificateRevocationList = true;
ServicePointManager.DefaultConnectionLimit = ServicePointManager.DefaultPersistentConnectionLimit;
ServicePointManager.EnableDnsRoundRobin = true;
ServicePointManager.DnsRefreshTimeout = 4*60*1000; // 4 minutes

ServicePointManager.UseNagleAlgorithm = True
ServicePointManager.Expect100Continue = True
ServicePointManager.CheckCertificateRevocationList = True
ServicePointManager.DefaultConnectionLimit = _
    ServicePointManager.DefaultPersistentConnectionLimit
ServicePointManager.EnableDnsRoundRobin = True
ServicePointManager.DnsRefreshTimeout = 4*60*1000

注解

当多个 IP 地址与主机名关联时，DNS 解析通常只返回第一个 IP 地址。 如果将此属性设置为 true，则后续 DNS 解析将循环访问特定主机的所有可用 IP 地址。 当服务使用 DNS 作为服务器或服务器群集之间的负载均衡机制时，此选项非常有用。

另请参阅

• ServicePoint