PST文件用于存储与Outlook和Exchange程序中保存的电子邮件文件夹、地址、联系信息、电子邮件消息和其他数据相关的信息。 Spire.Email支持读取PST文件并获取文件夹信息，如文件夹名称，消息计数和未读消息计数。

Step 1:将PST文件从磁盘加载到OutlookFile类的实例中。

OutlookFile olf = new OutlookFile(@"C:\Users\jack\Documents\Outlook Files\Sample.pst");

Step 2:获取文件夹集合。

OutlookFolderCollection folderCollection = olf.RootOutlookFolder.GetSubFolders();

Step 3:遍历集合并获取集合中每个元素的文件夹信息。

foreach (OutlookFolder folder in folderCollection)
{
    Console.WriteLine("Folder: " + folder.Name);
    Console.WriteLine("Total items: " + folder.ItemCount);
    Console.WriteLine("Total unread items: " + folder.UnreadItemCount);
    Console.WriteLine("Whether this folder has subfolders: {0}", (folder.HasSubFolders)?"Yes":"No");
    Console.WriteLine("------------------Next Folder--------------------");
}

输出：

完整代码：

[C#]

OutlookFile olf = new OutlookFile(@"C:\Users\jack\Documents\Outlook Files\Sample.pst");
OutlookFolderCollection folderCollection = olf.RootOutlookFolder.GetSubFolders();
foreach (OutlookFolder folder in folderCollection)
{
    Console.WriteLine("Folder: " + folder.Name);
    Console.WriteLine("Total items: " + folder.ItemCount);
    Console.WriteLine("Total unread items: " + folder.UnreadItemCount);
    Console.WriteLine("Whether this folder has subfolders: {0}", (folder.HasSubFolders)?"Yes":"No");
    Console.WriteLine("------------------Next Folder--------------------");
}
Console.WriteLine("Completed");

[VB.NET]

Dim olf As New OutlookFile("C:\Users\jack\Documents\Outlook Files\Sample.pst")
Dim folderCollection As OutlookFolderCollection = olf.RootOutlookFolder.GetSubFolders()
For Each folder As OutlookFolder In folderCollection
    Console.WriteLine("Folder: " + folder.Name)
    Console.WriteLine("Total items: " + folder.ItemCount)
    Console.WriteLine("Total unread items: " + folder.UnreadItemCount)
    Console.WriteLine("Whether this folder has subfolders: {0}", If((folder.HasSubFolders), "Yes", "No"))
    Console.WriteLine("------------------Next Folder--------------------")
Next
Console.WriteLine("Completed")

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