c＃标记交换电子邮件为

Question

我需要将电子邮件标记为在交换服务器上读取。

我使用以下方法来获得邮件，现在我需要将它们标记为已读

 strQuery = 
     @"<?xml version=""1.0""?> 
      <g:searchrequest xmlns:g=""DAV:""> 
       <g:sql> 
        SELECT 
         ""urn:schemas:mailheader:from"", ""urn:schemas:httpmail:htmldescription"" 
        FROM 
         ""https://********.*******.****/exchange/**.******/inbox/"" 
        WHERE 
         ""urn:schemas:httpmail:read"" = FALSE 
         AND ""DAV:contentclass"" = 'urn:content-classes:message' 

        </g:sql> 
      </g:searchrequest>"; 

我如何去这样做呢？

SP

Answer 1

"<?xml version=\"1.0\"?>" 
+ "<a:propertyupdate xmlns:a=\"DAV:\" xmlns:d=\"urn:schemas-microsoft-com:exch-data:\" " 
+ "xmlns:b=\"urn:schemas:httpmail:\" xmlns:c=\"xml:\">" 
+ "<a:set><a:prop><b:read>" + 1 
+ "</b:read></a:prop>" 
+ "</a:set></a:propertyupdate>";