.Net 4.6 WebClient 在IPV6下无法访问网络

[TiMorGO]

测试 API：WebClient

环境：ipv6
.net Framework: .net3.5
测试结果：可以访问

环境：ipv6
.net Framework: .net4.6
测试结果： 无法访问网络

------------------我是测试分割线--------------------
环境：ipv4
.net Framework: .net3.5
测试结果：可以访问

环境：ipv4
.net Framework: .net4.6
测试结果：可以访问

测试代码：

using UnityEngine;
using System;

public class NewBehaviourScript1 : MonoBehaviour {

	void Start () {
        try
        {
            WebClientEx webClient = new WebClientEx(5);
            webClient.DownloadString("https://www.baidu.com/");
        }
        catch (Exception e)
        {
            Debug.Log(e);
        }
	}
}

WebClient扩展代码：

using System.Collections.Specialized;
using System.Net;
using System;

public class WebClientEx : WebClient
{
    public string m_Url;
    public int m_TimeOut;

    public WebClientEx(int timeout)
    {
        m_TimeOut = 1000 * timeout;
    }

    protected override WebRequest GetWebRequest(Uri address)
    {
        HttpWebRequest request;
        if (address.Scheme == "https")
        {
            ServicePointManager.ServerCertificateValidationCallback = (a, b, c, d) => { return true; };
            request = (HttpWebRequest)base.GetWebRequest(address);
            request.ProtocolVersion = HttpVersion.Version10;
        }
        else
        {
            request = (HttpWebRequest)base.GetWebRequest(address);
        }

        request.Timeout = m_TimeOut;
        request.ReadWriteTimeout = m_TimeOut;
        m_Url = address.OriginalString;
        request.AllowAutoRedirect = false;
        request.AllowWriteStreamBuffering = true;


        CookieContainer cookieContainer = new CookieContainer();
        NameValueCollection collection = new NameValueCollection();
        collection.Add("Accept-Language", "zh-cn,zh;q=0.5");
        collection.Add("Accept-Encoding", "gzip,deflate");
        collection.Add("Accept-Charset", "GB2312,utf-8;q=0.7,*;q=0.7");
        collection.Add("Keep-Alive", "115");
        request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
        request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13";
        request.Headers.Add(collection);
        request.CookieContainer = cookieContainer;

        request.ServicePoint.BindIPEndPointDelegate = (servicePoint, remoteEndPoint, retryCount) =>
        {
            if (remoteEndPoint.AddressFamily == System.Net.Sockets.AddressFamily.InterNetworkV6)
                return new IPEndPoint(IPAddress.IPv6Any, 0);
            else
                return new IPEndPoint(IPAddress.Any, 0);
        };

        return request;
    }
}

[程序员的键盘]

如果是https不行，可以试试加上
if (address.Scheme == "https")
{
ServicePointManager.ServerCertificateValidationCallback = (a, b, c, d) => { return true; };
ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;//配置协议 4.6 好像默认不设SecurityProtocolType.Ssl3
request = (HttpWebRequest)base.GetWebRequest(address);
request.ProtocolVersion = HttpVersion.Version10;
}