Aspose.Email for .NET是一套完整的電子郵件處理控件，用于構建跨平臺應用程序，無需使用Microsoft Outlook即可創建，操作，轉換和傳輸電子郵件。API提供電子郵件處理功能，例如添加，提取或刪除郵件對象中的附件，通過添加或刪除收件人或更改主題等來自定義郵件頭。

Aspose.Email for .NET更新至v20.3，將流接口添加到OLMClient，允許使用ExchangeQueryBuilder類按電子郵件附件名稱查詢，歡迎下載體驗。

點擊下載Aspose.Email for .NET v20.2

新增與改善

OLM文件是 Outlook for Mac 的 存儲文件格式。OLM文件正在存儲本地數據，例如電子郵件，附件，便箋，日歷數據，聯系人，任務，日記等。

OLM文件僅由Mac Outlook使用。Windows版Outlook無法訪問或打開它。Windows版本的Outlook僅支持用于存儲數據的PST文件格式。盡管如此，仍然可以通過Aspose.Email for .NET使用OLM文件。

現在，從OLM存儲中提取消息更加靈活和快捷。

一個OlmMessageInfo類已被添加，其提供了有關在存儲的消息的簡要信息。該OlmFolder類延長通過以下方法：

//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);

該 OlmStorage 類延長通過以下方法：

//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);

以下示例顯示了新方法的使用：

// 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);
      }
    }
}