我想一定有人遇過這個問題，就是當使用 WebClient 或 WebRequest 類別抓取 HTTPS/SSL 的網頁時，出現以下錯誤訊息：
那是因為 .Net 針對安全的網路連線必須要有正確可受信任的憑證才可以連接！
如果你原本的程式長這樣：
[code:c#]
using System;
using System.Data;
using System.Configuration;
using System.Collections;
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.Net;
using System.IO;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
WebClient client = new WebClient();
Stream data = client.OpenRead("https://www.securedomain.com.tw/index.aspx");
StreamReader reader = new StreamReader(data);
string s = reader.ReadToEnd();
data.Close();
reader.Close();
Response.Write(s);
}
}
[/code]
你只要改成這樣就可以忽略憑證檢查的步驟了！
[code:c#]
using System;
using System.Data;
using System.Configuration;
using System.Collections;
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.Net;
using System.IO;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
public partial class _Default : System.Web.UI.Page
{
// 設定 HTTPS 連線時，不要理會憑證的有效性問題
public static bool ValidateServerCertificate(Object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
{
return true;
}
protected void Page_Load(object sender, EventArgs e)
{
// 設定 HTTPS 連線時，不要理會憑證的有效性問題
ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(ValidateServerCertificate);
WebClient client = new WebClient();
Stream data = client.OpenRead("https://www.securedomain.com.tw/index.aspx");
StreamReader reader = new StreamReader(data);
string s = reader.ReadToEnd();
data.Close();
reader.Close();
Response.Write(s);
}
}
[/code]
注意事項
‧記得要載入兩個命名空間：
[code:c#]
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
[/code]
相關連結 (於 2010/8/7 補充)