DNS刷新超时使用Mono [英] DNS Refresh Timeout with Mono

问题描述

虽然当前单项目的 ServicePointManager 类有 DnsRefreshTimeout 启用到它的接口属性。该相关的属性不落实

Although the current Mono project's ServicePointManager class has the DnsRefreshTimeout property enabled into its interface. The related property isn't implemented.

样品电话：

ServicePointManager.DnsRefreshTimeout = 10*60*1000; // 10 minutes

在运行我的应用程序得到运行下一个异常：

When running my application I get the next exception on runtime:

The requested feature is not implemented. (System.NotImplementedException) at System.Net.ServicePointManager.set_DnsRefreshTimeout (Int32 value) [0x00000] in /Developer/MonoTouch/Source/mono/mcs/class/System/System.Net/ServicePointManager.cs:213

下面是实际执行：

[MonoTODO]
public static int DnsRefreshTimeout
{
    get {
        throw GetMustImplement ();
    }
    set {
        throw GetMustImplement ();
    }
}

我觉得我没有足够的知识来实现这个功能都是由我自己，只是因为我正在开发自上个月C＃的Mono应用。

I think I don't have enough knowledge to implement this feature all by myself just because I am developing C# Mono applications since last month.

那么，任何人都知道这一个解决方法吗？或应我请求Mono项目团队功能实现？

So, do anyone know one workaround for this? Or shall I request a feature implementation for the Mono project team?

我开发一个Xamarin跨平台应用程序，我真的需要缓存我的DNS解析至少10分钟。

I am developing a Xamarin cross-platform application and I really need to cache my DNS resolution at least for 10 minutes.

诗功能要求在 https://bugzilla.xamarin.com/show_bug.cgi?id=11424

推荐答案

我没有一个解决方法，但我有一个解决方法：

I don't have a fix, but I have a workaround:

var request = (HttpWebRequest)WebRequest.Create("http://www.google.com/");

// Disable KeepAlive so we don't reuse  connections
request.KeepAlive = false;

// Clear out the cached host entry
var hostField     = typeof(ServicePoint).GetField("host", BindingFlags.NonPublic | BindingFlags.Instance);
var hostFieldLock = typeof(ServicePoint).GetField("hostE", BindingFlags.NonPublic | BindingFlags.Instance);
var hostLock      = hostFieldLock.GetValue(request.ServicePoint);
lock (hostLock)
    hostField.SetValue(request.ServicePoint, null);

这是基于当前版本的ServicePoint为单声道，您可以查看的这里为2015年3月的

This is based on the current version of ServicePoint for mono which you can view here as of March 2015.

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