由于服務端SSL證書不可信，導致調用https的Web serivce 出現"基礎連接已經斷開"（
The underlying connection was closed）的錯誤，對于這個錯誤，可以使用代碼忽略
.Net1.0的做法:
????public?class?AcceptServerNameMismatch?:?ICertificatePolicy
????
{
????????//?HACK:?This?is?a?workaround.??The?.NET?Framwork?should?expose?these,?but?they?don't.
????????public?enum?CertificateProblem?:?long
????????{
????????????CertEXPIRED?=?2148204801,
????????????CertVALIDITYPERIODNESTING?=?2148204802,
????????????CertROLE?=?2148204803,
????????????CertPATHLENCONST?=?2148204804,
????????????CertCRITICAL?=?2148204805,
????????????CertPURPOSE?=?2148204806,
????????????CertISSUERCHAINING?=?2148204807,
????????????CertMALFORMED?=?2148204808,
????????????CertUNTRUSTEDROOT?=?2148204809,
????????????CertCHAINING?=?2148204810,
????????????CertREVOKED?=?2148204812,
????????????CertUNTRUSTEDTESTROOT?=?2148204813,
????????????CertREVOCATION_FAILURE?=?2148204814,
????????????CertCN_NO_MATCH?=?2148204815,
????????????CertWRONG_USAGE?=?2148204816,
????????????CertUNTRUSTEDCA?=?2148204818
????????}
????????/**////?<summary>
????????///?Implement?CheckValidationResult?to?ignore?problems?that?we?are?willing?to?accept.
????????///?</summary>
????????public?bool?CheckValidationResult(ServicePoint?sp,?X509Certificate?cert,
????????WebRequest?request,?int?problem)
????????{
????????????/**//*
????????????int?CertificateNameDoesntMatch?=?unchecked(?(int)?CertificateProblem.CertCN_NO_MATCH);
????????????if?(?problem?==?CertificateNameDoesntMatch?)?//?only?accept?server?name?failed?match
????????????return?true;
????????????//?The?1.1?framework?calls?this?method?with?a?problem?of?0,?even?if?nothing?is?wrong
????????????return?(problem?==?0);
????????????*/
????????????return?true;
????????}
????}System.Net.ServicePointManager.CertificatePolicy?=?new?AcceptServerNameMismatch();? .Net2.0+ 的做法，增加一個委托，在委托中判斷并忽略
using?System.Net.Security;
using?System.Security.Cryptography.X509Certificates;
ServicePointManager.ServerCertificateValidationCallback?+=
????????????delegate(object?sender,?X509Certificate?cert,?X509Chain?chain,?SslPolicyErrors?sslError)
????????????{
????????????????bool?validationResult?=?true;
????????????????return?validationResult;
????????????};?