在EWS中，如何获取消息的纯文本和HTML正文作为字符串，以保持原始字符编码 [英] In EWS, how to get message's both plain-text and HTML bodies as strings keeping the original character encoding

问题描述

我正在使用Exchange 2010(不是Exchange 2013，它允许调用者直接请求纯文本和HTML正文).

I'm working with Exchange 2010 (not Exchange 2013 which lets the caller request both plain-text and HTML bodies directly).

要获取HTML正文，我使用的是类似的内容:

To get HTML body, I'm using something like:

ExtendedPropertyDefinition PR_BODY_HTML = new ExtendedPropertyDefinition(0x1013, MapiPropertyType.Binary);
ExtendedPropertyDefinition PR_INTERNET_CPID = new ExtendedPropertyDefinition(0x3FDE, MapiPropertyType.Long); 
PropertySet properties = new PropertySet(BasePropertySet.FirstClassProperties);
properties.RequestedBodyType = BodyType.Text;
properties.Add(EmailMessageSchema.Body);
properties.Add(PR_BODY_HTML);
properties.Add(PR_INTERNET_CPID);
...
byte[] htmlBodyBytes;
string htmlBody;
int iCP;
if (item.TryGetProperty<int>(PR_INTERNET_CPID, out iCP))
{
    // The code never enters here
}
if (item.TryGetProperty<byte[]>(PR_BODY_HTML, out htmlBodyBytes))
{
    htmlBody = Encoding.GetEncoding(65001).GetString(htmlBodyBytes);
}
string textBody = item.Body.Text;

对于纯文本主体，我得到了正确的字符串表示形式.但是HTML正文只给我字节，我也不知道要传递给GetString的代码页.目前，UTF-8的代码页已进行硬编码，但这不适用于生产环境.我需要找到HTML部分的代码页，或者找到从消息中提取它的另一种方法.当然，我可以对EWS设置RequestedBodyType = BodyType.HTML进行单独查询，但最好不要进行其他查询.我以为PR_INTERNET_CPID MAPI属性(0x3FDE)可以满足我的需要，但是从来没有填充过(我再次检查它是否存在于邮件服务器上，但我无法通过EWS获得它).

For plain-text body, I get the correct string representation. But HTML body gives me just bytes and I don't know the codepage to pass to GetString. Currently, UTF-8's codepage is hardcoded but this won't work for production. I need to either find out the codepage of the HTML part or find another method of extracting it from the message. Of course, I could make a separate query to EWS setting RequestedBodyType = BodyType.HTML but I would better not make an additional query. I thought PR_INTERNET_CPID MAPI property (0x3FDE) will fit my needs but it's never populated (I double-checked that it exists on the mail server but I can't get it via EWS).

因此，我需要说服托管EWS库以字符串形式返回HTML和纯文本，或者让我获得PR_INTERNET_CPID值.我该怎么办?

So I need to either convince Managed EWS library to return both HTML and plain-text as strings or get me PR_INTERNET_CPID value. What can I do for that?

推荐答案

好，事实证明PidTagInternetCodepage(PR_INTERNET_CPID)的类型为MapiPropertyType.Integer，而不是MapiPropertyType.Long(尽管MSDN表示PT_LONG).调整后，我可以很好地得到有关的值.

OK, it turns out that PidTagInternetCodepage (PR_INTERNET_CPID) has type MapiPropertyType.Integer, not MapiPropertyType.Long (although MSDN says PT_LONG). After the adjustment, I can get the value in question just fine.

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