读取文本/html消息部分时遇到问题 [英] Having trouble reading the text/html message part

问题描述

我正在尝试使用.Net提取电子邮件的主题和正文.除了text/html MessagePart之外，一切似乎还可以.我不确定编码等-有人能正常工作吗?尝试转换时，这对我来说是错误的.

I'm trying to pull out the subject and body of an email with .Net. It seems to go OK except for the text/html MessagePart. I'm not sure of the encoding etc - has anybody got this working OK? It errors for me when trying to convert.

这是text/html正文数据的原始字符串

Here is the raw string for the text/html Body Data

"PGRpdiBkaXI9Imx0ciI-dGV4dCBpbiBoZXJlPGJyPjwvZGl2Pg0K"

"PGRpdiBkaXI9Imx0ciI-dGV4dCBpbiBoZXJlPGJyPjwvZGl2Pg0K"

这会引发错误.

该输入不是有效的Base-64字符串，因为它包含非base 64字符，两个以上的填充字符或填充字符中的非法字符."

"The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters."

这是代码:

    UsersResource.MessagesResource.GetRequest gr = gs.Users.Messages.Get(userEmail, TextBox1.Text);
    gr.Format = UsersResource.MessagesResource.GetRequest.FormatEnum.Full;                
    Message m = gr.Execute();

            foreach (MessagePart p in m.Payload.Parts)
            {
                if (p.MimeType == "text/html")
                {
                    try
                    {
                        byte[] data = Convert.FromBase64String(p.Body.Data);
                        string decodedString = Encoding.UTF8.GetString(data);
                        Response.Write(decodedString);
                    }
                    catch (Exception ex) { }
                }
            }

我解码出错了?

感谢您的帮助.

推荐答案

主体数据似乎是base64url编码的，而不是base64编码的. 区别在于，在编码的64个字符的字母表中使用了-和_而不是+和/. 一种解决方案是在调用FromBase64String之前分别用+和/替换所有-和_字符.

The body data appears to be base64url-encoded, not base64-encoded. The difference is the use of - and _, instead of + and /, in the encoding’s alphabet of 64 characters. One solution is to replace all - and _ characters with + and / respectively, before calling FromBase64String.

请参见 http://tools.ietf.org/html/rfc4648#section-5

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