在我弄清楚如何实际构建 OP 提供的代码后，我发现它对于开始使用 Outlook 非常有用，因此我想在下面分享完成的代码。
using System;
using System.Collections.Generic;//List
using System.Linq;//Array
//using System.Text;
//using System.Threading.Tasks;
using System.Diagnostics;//Process
using System.Runtime.InteropServices;//Marshal
using System.Data;//DataTable
using System.Reflection;//Missing
using Microsoft.Office.Interop.Outlook;//.OST files, needs Microsoft.Office.Interop.Outlook.dll
//TO DO: If you use the Microsoft Outlook 11.0 Object Library, uncomment the following line.
using Outlook = Microsoft.Office.Interop.Outlook;
namespace WatchOutlookMails
{
class StoreFormat
{
public DataTable GetInboxItems(DateTime dtpStartDate, DateTime dtpEndDate)
{
DataTable inboxTable;
string filter = string.Format("[ReceivedTime] >= '{0:dd/MM/yyyy 12:00 AM}' and [ReceivedTime] <= '{1:dd/MM/yyyy 11:59 PM}'", dtpStartDate, dtpEndDate);
Outlook.Application outlookApp = GetApplicationObject();
#if false//only needed if you want to select another folder
Outlook.Folder root = outlookApp.Session.DefaultStore.GetRootFolder() as Outlook.Folder;
EnumerateFolders(root);
#endif
//inbox
Outlook.MAPIFolder inboxFolder = outlookApp.Session.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderInbox);
inboxTable = CreateTable();
if (inboxFolder.Items.Count > 0)
{
Items restrictedItems = inboxFolder.Items.Restrict(filter);
const bool SortDescending = true;
restrictedItems.Sort("[ReceivedTime]", SortDescending);
foreach (var item in restrictedItems)//item is a "COM Object" (?)
{
MailItem mail = item as Outlook.MailItem;
if (mail != null)
{
//try
//{
DataRow row = inboxTable.NewRow();
//row["sn"] = (++count).ToString();
row["sn"] = mail.EntryID + " " + mail.ReceivedByEntryID;
row["MailType"] = "Inbox";
row["SenderName"] = mail.SenderName;
row["SenderEmail"] = mail.SenderEmailAddress;
row["ReceivedDate"] = mail.ReceivedTime;
row["Subject"] = mail.Subject;
row["Body"] = mail.Body != null ? (mail.Body.Length > 25 ? mail.Body.Substring(0, 25) : mail.Body) : null;
//row["Body"] = mail.Body != null ? mail.Body : "";
row["MailSize"] = mail.Size.ToString();
int AttachmentSize = 0;
foreach (Outlook.Attachment attachment in mail.Attachments)
{
if (attachment != null)
AttachmentSize += attachment.Size;
}
row["AttachmentCount"] = mail.Attachments.Count;
row["AttachmentSize"] = AttachmentSize;
inboxTable.Rows.Add(row);
//catch (Exception ex)
//{
// break;
//}
}
}
}
return inboxTable;
}
private DataTable CreateTable()
{
DataTable T = new DataTable();
T.Columns.Add("sn", typeof(string));
T.Columns.Add("MailType", typeof(string));
T.Columns.Add("SenderName", typeof(string));
T.Columns.Add("SenderEmail", typeof(string));
T.Columns.Add("ReceivedDate", typeof(string));
T.Columns.Add("Subject", typeof(string));
T.Columns.Add("Body", typeof(string));
T.Columns.Add("MailSize", typeof(int));
T.Columns.Add("AttachmentCount", typeof(int));
T.Columns.Add("AttachmentSize", typeof(int));
return T;
}
private void EnumerateFoldersInDefaultStore()
{
Outlook.Application outlookApp = GetApplicationObject();
Outlook.Folder root = outlookApp.Session.DefaultStore.GetRootFolder() as Outlook.Folder;
EnumerateFolders(root);
return;
}
private void EnumerateFolders(Outlook.Folder folder)
{
Outlook.Folders childFolders = folder.Folders;
if (childFolders.Count > 0)
{
foreach (Outlook.Folder childFolder in childFolders)
{
// Write the folder path.
//Debug.WriteLine(childFolder.FolderPath);
// Call EnumerateFolders using childFolder.
// Uses recursion to enumerate Outlook subfolders.
EnumerateFolders(childFolder);
}
}
return;
}
/// <summary>
/// obtain an Application object that represents an active instance of Microsoft Outlook,
/// if there is one running on the local computer, or to create a new instance of Outlook,
/// log on to the default profile, and return that instance of Outlook
/// </summary>
/// <returns></returns>
private Outlook.Application GetApplicationObject()
{
// source: https://msdn.microsoft.com/en-us/library/ff462097.aspx
Outlook.Application application = null;
// Check whether there is an Outlook process running.
if (Process.GetProcessesByName("OUTLOOK").Count() > 0)
{
// If so, use the GetActiveObject method to obtain the process and cast it to an Application object.
application = Marshal.GetActiveObject("Outlook.Application") as Outlook.Application;
}
else
{
// If not, create a new instance of Outlook and log on to the default profile.
application = new Outlook.Application();
Outlook.NameSpace nameSpace = application.GetNamespace("MAPI");
nameSpace.Logon("", "", Missing.Value, Missing.Value);
nameSpace = null;
}
// Return the Outlook Application object.
return application;
}
}//end class
}//end ns
为了填补缺失的部分，我借用了https://support.microsoft.com/en-us/kb/310259，对于枚举文件夹：https://msdn.microsoft.com/en-us/library/office/ff184607.aspx
