我需要从IIS解析来自SMTP badmail文件夹的NDR文件。附加到NDR的是base64编码的内容。这就是我需要达到的目标。我希望，使用StreamReader，它将是一行，但是当一个连续的.ReadLine时，它们是分开的行。
以下是NDR的示例：
From: postmaster
To: hidden
Date: Thu, 12 Nov 2009 11:56:14 -0500
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
boundary="9B095B5ADSN=_01CA638BF4740C5500000045spinstitch.com"
X-DSNContext: 7ce717b1 - 1378 - 00000002 - C00402EF
Message-ID:
Subject: Delivery Status Notification (Failure)
This is a MIME-formatted message.
Portions of this message may be unreadable without a MIME-capable mail program.
--9B095B5ADSN=_01CA638BF4740C5500000045spinstitch.com
Content-Type: text/plain; charset=unicode-1-1-utf-7
This is an automatically generated Delivery Status Notification.
Delivery to the following recipients failed.
hidden
--9B095B5ADSN=_01CA638BF4740C5500000045spinstitch.com
Content-Type: message/delivery-status
Reporting-MTA: dns;spinstitch.com
Received-From-MTA: dns;spinstitch
Arrival-Date: Thu, 12 Nov 2009 11:56:11 -0500
Final-Recipient: rfc822;hidden
Action: failed
Status: 5.4.0
--9B095B5ADSN=_01CA638BF4740C5500000045spinstitch.com
Content-Type: message/rfc822
Received: from mail pickup service by spinstitch.com with Microsoft SMTPSVC;
Thu, 12 Nov 2009 11:56:11 -0500
MIME-Version: 1.0
From: hidden
To: hidden
Date: 12 Nov 2009 11:56:11 -0500
Subject: For Sale: 463 Saltaire Dr. Calabash, NC US 28467 $6,800,000
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: base64
Message-ID:
X-OriginalArrivalTime: 12 Nov 2009 16:56:11.0813 (UTC) FILETIME=[09CED550:01CA63B9]
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--9B095B5ADSN=_01CA638BF4740C5500000045spinstitch.com--
答案 0 :(得分：1)
此正则表达式与您的base64字符串匹配并对其进行解码：
Match m = Regex.Match(
File.ReadAllText(@"c:\edit1.txt"),
@"X-OriginalArrivalTime:.*?\r\n\r\n([\s\S]*)\r\n\r\n");
byte[] data = Convert.FromBase64String(m.Groups[1].Value);
如果您不想使用正则表达式，可以尝试跳过每一行，直到找到X-OriginalArrivalTime标题。从那里，您可以保留每一行，直到找到空行或流结束。
答案 1 :(得分：0)
请尝试使用Read()方法。