不包含电子邮件收件箱中的某些主题的电子邮件使用EWS搜索

Question

我正在使用EWS升级使用WebDAV查询Exchange Server 2003邮箱的应用程序，新版本将与Exchange Server 2010 SP2一起使用。

我想排除有主题中包含这些搜索字词的电子邮件项目： “脂肪;转让;沙盒：分配”

MSDN库：使用EWS托管API搜索的邮箱项目] 1，并找到了如何过滤收件人，并且电子邮件有附件，但现在我需要更进一步，只阅读没有上述主题的电子邮件（4个不同的字符串排除）

这里是我试过的代码：

searchFilterCollection.Add(new SearchFilter.SearchFilterCollection(LogicalOperator.And, new SearchFilter.IsEqualTo(EmailMessageSchema.IsRead, false))); 
searchFilterCollection.Add(new SearchFilter.SearchFilterCollection(LogicalOperator.And, new SearchFilter.IsEqualTo(EmailMessageSchema.HasAttachments, true))); 
searchFilterCollection.Add(new SearchFilter.SearchFilterCollection(LogicalOperator.And, new SearchFilter.ContainsSubstring(EmailMessageSchema.Subject, "FATS;Assignment;Sandbox: Assignment"))); 

但我知道（最后一项）只能找到包含这些条款的项目，我怎样才能使用SearchFilter排除这些条款？

Answer 1

我发现MSDN Library: Filtering on Not by using the EWS Managed API了答案：

我必须使用SearchFilter.Not对象：

searchFilterCollection.Add(new SearchFilter.Not(new SearchFilter.ContainsSubstring(ItemSchema.Subject, "FATS"))); 

然后我再补充一点到集合：

searchFilterCollection.Add(new SearchFilter.SearchFilterCollection(LogicalOperator.And, new SearchFilter.IsEqualTo(EmailMessageSchema.IsRead, false))); 
searchFilterCollection.Add(new SearchFilter.SearchFilterCollection(LogicalOperator.And, new SearchFilter.IsEqualTo(EmailMessageSchema.HasAttachments, true))); 

searchFilterCollection.Add(new SearchFilter.Not(new SearchFilter.ContainsSubstring(ItemSchema.Subject, "FATS"))); 

// add all to the collection... 
SearchFilter searchFilter = new SearchFilter.SearchFilterCollection(LogicalOperator.Or, searchFilterCollection.ToArray());