Aspose.Email for .NET是一套完整的电子邮件处理控件，用于构建跨平台应用程序，无需使用Microsoft Outlook即可创建，操作，转换和传输电子邮件。API提供电子邮件处理功能，例如添加，提取或删除邮件对象中的附件，通过添加或删除收件人或更改主题等来自定义邮件头。

Aspose.Email for .NET更新至v20.3，将流接口添加到OLMClient，允许使用ExchangeQueryBuilder类按电子邮件附件名称查询，欢迎下载体验。

点击下载Aspose.Email for .NET v20.2

新增与改善

OLM文件是 Outlook for Mac 的 存储文件格式。OLM文件正在存储本地数据，例如电子邮件，附件，便笺，日历数据，联系人，任务，日记等。

OLM文件仅由Mac Outlook使用。Windows版Outlook无法访问或打开它。Windows版本的Outlook仅支持用于存储数据的PST文件格式。尽管如此，仍然可以通过Aspose.Email for .NET使用OLM文件。

现在，从OLM存储中提取消息更加灵活和快捷。

一个OlmMessageInfo类已被添加，其提供了有关在存储的消息的简要信息。该OlmFolder类延长通过以下方法：

//gets the subfolder by name
OlmFolder GetSubFolder(string subfolderName, bool ignoreCase);
 
//exposes the enumerator, which supports an iteration of MapiMessages in the current folder
IEnumerable<MapiMessage> EnumerateMapiMessages();
 
//exposes the enumerator, which supports an iteration of OlmMessageInfo's in the current folder
IEnumerable<OlmMessageInfo> EnumerateMessages();
 
//exposes the enumerator, which supports an iteration of OlmMessageInfo's within a given range
IEnumerable<OlmMessageInfo> EnumerateMessages(int startIndex, int count);
 
//exposes the enumerator, which supports an iteration of OlmMessageInfo's by search criteria
IEnumerable<OlmMessageInfo> EnumerateMessages(MailQuery query);

该 OlmStorage 类延长通过以下方法：

//load OLM storage from file
 static OlmStorage FromFile(string fileName); 
  
 //load OLM from stream
 static OlmStorage FromStream(Stream stream); 
  
 //gets the folder hierarchy
 ListGetFolders(); 
  
 //gets the folder by name
 OlmFolder GetFolder(string name, bool ignoreCase); 
  
 //extracts the MapiMessage from OLM storage
 MapiMessage ExtractMapiMessage(OlmMessageInfo messageInfo);

以下示例显示了新方法的使用：

// Enumerates all messages in a given folder
using (OlmStorage olm = OlmStorage.FromFile(fileName))
{
    OlmFolder inbox = olm.GetFolder("inbox", true);
 
    foreach (OlmMessageInfo messageInfo in inbox.EnumerateMessages())
    {
        Console.WriteLine(messageInfo.Subject);
    }
}
 
// Enumerates a range of messages in a given folder
using (OlmStorage olm = OlmStorage.FromFile(fileName))
{
    OlmFolder inbox = olm.GetFolder("inbox", true);
    int startIndex = 10;
    int count = 100;
 
    foreach (OlmMessageInfo messageInfo in inbox.EnumerateMessages(startIndex, count))
    {
        Console.WriteLine(messageInfo.Subject);
    }
}
 
// Enumerates messages by search criteria
using (OlmStorage olm = OlmStorage.FromFile(fileName))
{
    OlmFolder inbox = olm.GetFolder("inbox", true);
  
    MailQueryBuilder mailQueryBuilder = new MailQueryBuilder();
    mailQueryBuilder.Subject.Contains("invitation");
    mailQueryBuilder.From.Contains("Mark");
 
    foreach (OlmMessageInfo messageInfo in inbox.EnumerateMessages(mailQueryBuilder.GetQuery()))
    {
        Console.WriteLine(messageInfo.Subject);
    }
}
 
// Enumerates all messages and the extraction of some of them
using (OlmStorage olm = OlmStorage.FromFile(fileName))
{
    OlmFolder inbox = olm.GetFolder("inbox", true);
 
    foreach (OlmMessageInfo messageInfo in inbox.EnumerateMessages()
    {
      if (messageInfo.HasAttachments)
      {
        MapiMessage msg = olm.ExtractMessage(messageInfo);
      }
    }
}