C# 抓取SSL加密的网页(https) 含证书验证

因为项目需要，需从向HTTPS页面发送一些数据并获取返回的数据。普通的http网页好办，直接用HttpWebRequest就可以轻松实现。如果对方网页是HTTP但需要登录后才能查看的，也不难实现：用HttpWebRequest加上身份信息构造一个HTTP基层协议内容，再和服务器来一次往返提取到SessionID然后发送就可以搞定。

Code
(大家可以试下用来开发淘宝电子交易方面的了，例如支付宝方面的程序代码)

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System;
using System.Net;
using System.IO;
using System.Text;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using System.Runtime.InteropServices;

/// <summary>
/// Class1 的摘要说明
/// </summary>
public class Class1
{
private static int CERT_STORE_PROV_SYSTEM = 10;
private static int CERT_SYSTEM_STORE_CURRENT_USER = (1 << 16);
///private static int CERT_SYSTEM_STORE_LOCAL_MACHINE = (2 << 16);

[DllImport("CRYPT32", EntryPoint = "CertOpenStore", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr CertOpenStore(
int storeProvider, int encodingType,
int hcryptProv, int flags, string pvPara);

[DllImport("CRYPT32", EntryPoint = "CertEnumCertificatesInStore", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr CertEnumCertificatesInStore(
IntPtr storeProvider,
IntPtr prevCertContext);

[DllImport("CRYPT32", EntryPoint = "CertCloseStore", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern bool CertCloseStore(
IntPtr storeProvider,
int flags);

X509CertificateCollection m_certs;

public Class1()
{
m_certs = new X509CertificateCollection();

IntPtr storeHandle;
storeHandle = CertOpenStore(CERT_STORE_PROV_SYSTEM, 0, 0, CERT_SYSTEM_STORE_CURRENT_USER, "MY");
IntPtr currentCertContext;
currentCertContext = CertEnumCertificatesInStore(storeHandle, (IntPtr)0);
int i = 0;
while (currentCertContext != (IntPtr)0)
{
m_certs.Insert(i++, new X509Certificate(currentCertContext));
currentCertContext = CertEnumCertificatesInStore(storeHandle, currentCertContext);
}
CertCloseStore(storeHandle, 0);
}

public int Init()
{
IntPtr storeHandle;
storeHandle = CertOpenStore(CERT_STORE_PROV_SYSTEM, 0, 0, CERT_SYSTEM_STORE_CURRENT_USER, "MY");
IntPtr currentCertContext;
currentCertContext = CertEnumCertificatesInStore(storeHandle, (IntPtr)0);
int i = 0;
while (currentCertContext != (IntPtr)0)
{
m_certs.Insert(i++, new X509Certificate(currentCertContext));
currentCertContext = CertEnumCertificatesInStore(storeHandle, currentCertContext);
}
CertCloseStore(storeHandle, 0);

return m_certs.Count;
}

public X509Certificate this[int index]
{
get
{
// Check the index limits.
if (index < 0 || index > m_certs.Count)
return null;
else
return m_certs[index];
}
}
}

---------------------------------------------------------------------------

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using System.Text;
using System.Net;
using System.IO;

using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using System.Runtime.InteropServices;

internal class AcceptAllCertificatePolicy : ICertificatePolicy
{
public AcceptAllCertificatePolicy()
{
}

public bool CheckValidationResult(ServicePoint sPoint, X509Certificate cert, WebRequest wRequest, int certProb)
{
return true;
}
}

public partial class _Default : System.Web.UI.Page
{
protected static string cookieHeader;

protected void Page_Load(object sender, EventArgs e)
{
}

protected void btnSend_Click(object sender, EventArgs e)
{

ServicePointManager.CertificatePolicy = new AcceptAllCertificatePolicy();

string postData = @"CREDITID=CDB992362323";
Encoding encoding = Encoding.GetEncoding("gb2312");
string strUrl = https://www.server.com/asdfjlsdf.jsp; byte[] data = encoding.GetBytes(postData);
//准备请求


HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(strUrl);
myRequest.ClientCertificates.Add(s[0]); //证书可以遍历出来让客户选择，但我这里是测试程序，直接就选择我需要的那个了。
myRequest.Method = "POST";
myRequest.ContentType = "application/x-www-form-urlencoded";
myRequest.ContentLength = data.Length;
myRequest.KeepAlive = true;

Stream newStream = myRequest.GetRequestStream();
//发送数据
newStream.Write(data, 0, data.Length);
newStream.Close();

//读取回来的数据
HttpWebResponse res = (HttpWebResponse)myRequest.GetResponse();
StreamReader sr = new StreamReader(res.GetResponseStream(), System.Text.Encoding.Default);
txtAccept.Text = sr.ReadToEnd();
sr.Close();
res.Close();

return;
}

}