C# 优化Outlook加载项中搜索电子邮件的代码

我有下一个将特定电子邮件信息打印到Excel文件的解决方案。我选择在日期之前必须写哪些电子邮件

    [STAThread]
    public void Summary(DateTime startDate, DateTime finishDate, string fileSaveAdress)
    {
        try
        {
            Outlook.Application oApp = new Outlook.Application();
            Outlook.NameSpace oNs = oApp.GetNamespace("mapi");
            oNs.Logon(Missing.Value, Missing.Value, false, false);

            Excel.Application xlApp = new Excel.Application();
            Excel.Workbook xlWorkBook = xlApp.Workbooks.Add(Missing.Value);
            Excel.Worksheet xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);

            Outlook.MAPIFolder pickedFolder = oApp.Session.PickFolder();
            Outlook.Items pickedFolderItems = pickedFolder.Items;

            int iX = 1;
            int iY = 1;
            int iAdjustColomn = 0;

            foreach (object obj in pickedFolderItems)
            {
                if (obj is Outlook.MailItem)
                {
                    Outlook.MailItem oMsg = (Outlook.MailItem)obj;
                    if (oMsg.ReceivedTime.ToUniversalTime() > startDate.ToUniversalTime() &&
                        oMsg.ReceivedTime.ToUniversalTime() < finishDate.ToUniversalTime())
                    {
                        xlWorkSheet.Cells[iY, iX] = oMsg.ReceivedTime.ToShortDateString() + " " +
                                                    oMsg.ReceivedTime.ToShortTimeString();
                        xlWorkSheet.Cells[iY, ++iX] = oMsg.Sender.Name;

                        for (int i = 1; i <= oMsg.Recipients.Count; i++)
                        {
                            xlWorkSheet.Cells[iY, ++iX] = oMsg.Recipients[i].Name;
                        }

                        xlWorkSheet.Cells[iY, ++iX] = oMsg.Subject;

                        Outlook.Attachments AttachmentArray = oMsg.Attachments;
                        if (AttachmentArray.Count != 0)
                        {
                            foreach (Outlook.Attachment attachment in AttachmentArray)
                            {
                                xlWorkSheet.Cells[iY, ++iX] = attachment.DisplayName;
                            }
                        }

                        iAdjustColomn += iX;

                        iY += 2;
                        iX = 1;
                    }
                }
            }

            for (int i = 1; i < iAdjustColomn; i++)
            {
                AutoFitColumn(xlWorkSheet, i);
            }

            xlWorkBook.SaveAs(fileSaveAdress, Excel.XlFileFormat.xlWorkbookNormal, Missing.Value, Missing.Value, Missing.Value, Missing.Value,
                              Excel.XlSaveAsAccessMode.xlExclusive, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);
            xlWorkBook.Close(true, Missing.Value, Missing.Value);
            xlApp.Quit();

            oNs.Logoff();
        }
        catch (Exception e)
        {
            ErrorReport er = new ErrorReport(e.Message);
            er.ShowDialog();
        }
    }

[STAThread]
公共作废摘要（DateTime startDate、DateTime finishDate、字符串文件存储地址）
{
尝试
{
Outlook.Application oApp=新建Outlook.Application（）；
Outlook.NameSpace-oNs=oApp.GetNamespace（“mapi”）；
oNs.Logon（Missing.Value，Missing.Value，false，false）；
Excel.Application xlApp=新的Excel.Application（）；
Excel.Workbook xlWorkBook=xlApp.Workbooks.Add（缺少.Value）；
Excel.Worksheet xlWorkSheet=（Excel.Worksheet）xlWorkBook.Worksheets.get_项（1）；
Outlook.MapipFolder pickedFolder=oApp.Session.PickFolder（）；
Outlook.Items pickedFolderItems=pickedFolder.Items；
int iX=1；
int-iY=1；
int=0；
foreach（pickedFolderItems中的对象对象）
{
if（obj是Outlook.MailItem）
{
Outlook.MailItem oMsg=（Outlook.MailItem）obj；
如果（oMsg.ReceivedTime.ToUniversalTime（）>startDate.ToUniversalTime（））&&
oMsg.ReceivedTime.ToUniversalTime（）for（int i=1；i我将使用计数器将使用Outlook对象的foreach调用替换为for循环。对于Outlook数据，使用foreach通常是一种不好的做法

另外，一种更快的方法是将表对象与Folder.GetTable一起使用，您可以在其中设置迭代中要检索的列/字段的最小数量，以最小化内存使用

来自Microsoft（）的示例：

我真的不确定它是否能解决问题。也许从Outlook本身筛选任何其他通用集合中的邮件会更有用。我的意思是先复制一份。我真的不确定内存膨胀可能发生在哪里，但您应该始终使用for语句，而不是foreach处理Outlook对象。另外，一种更快的方法是将表对象与Folder.GetTable一起使用，您可以在其中设置迭代要检索的列/字段的最小数量，以最大限度地减少内存使用。谢谢。我将在我的项目中使用您的建议。它非常有用！
Sub RemoveAllAndAddColumns()
'Declarations
Dim Filter As String
Dim oRow As Outlook.Row
Dim oTable As Outlook.Table
Dim oFolder As Outlook.Folder

'Get a Folder object for the Inbox
Set oFolder = Application.Session.GetDefaultFolder(olFolderInbox)

'Define Filter to obtain items last modified after May 1, 2005
Filter = "[LastModificationTime] > '5/1/2005'"
'Restrict with Filter
Set oTable = oFolder.GetTable(Filter)

'Remove all columns in the default column set
oTable.Columns.RemoveAll
'Specify desired properties
With oTable.Columns
    .Add ("Subject")
    .Add ("LastModificationTime")
    'PR_ATTR_HIDDEN referenced by the MAPI proptag namespace
    .Add ("http://schemas.microsoft.com/mapi/proptag/0x10F4000B")
End With

'Enumerate the table using test for EndOfTable
Do Until (oTable.EndOfTable)
    Set oRow = oTable.GetNextRow()
    Debug.Print (oRow("Subject"))
    Debug.Print (oRow("LastModificationTime"))
    Debug.Print (oRow("http://schemas.microsoft.com/mapi/proptag/0x10F4000B"))
Loop
End Sub