Exchage 2007 Client Application Functions（2） -- 如何收取邮件

上一篇介绍的Exchange2007客户端程序中怎么发送邮件。
现在，我来简单介绍一下怎么收取邮件。
来看代码：

   public Hashtable GetAllMails(DateTime StartDate, DateTime EndDate)
        {
            try
            {
                if (null == this.m_esb) return null;

                DistinguishedFolderIdType[] dfit = new DistinguishedFolderIdType[1];

                //get the root folder ID

                dfit[0] = new DistinguishedFolderIdType();

                dfit[0].Id = DistinguishedFolderIdNameType.inbox;

                //set the props that we want to retrieve

                FolderResponseShapeType frst = new FolderResponseShapeType();

                frst.BaseShape = DefaultShapeNamesType.AllProperties;

                //get the folder

                GetFolderType gftRoot = new GetFolderType();

                gftRoot.FolderIds = dfit;

                gftRoot.FolderShape = frst;

                GetFolderResponseType gfrt = this.m_esb.GetFolder(gftRoot);

                FolderInfoResponseMessageType firmt = ((FolderInfoResponseMessageType)gfrt.ResponseMessages.Items[0]);

                   
                FolderIdType[] fita = new FolderIdType[1];

                fita[0] = new FolderIdType();

                if (firmt.ResponseClass == ResponseClassType.Success)
                {
                    fita[0].Id = ((FolderInfoResponseMessageType)gfrt.ResponseMessages.Items[0]).Folders[0].FolderId.Id;
                }

                if (fita[0].Id == null) return new Hashtable();
                //request AllProperties

                PathToUnindexedFieldType[] ptufta = new PathToUnindexedFieldType[1];

                ptufta[0] = new PathToUnindexedFieldType();

                ptufta[0].FieldURI = UnindexedFieldURIType.itemItemClass;

                ItemResponseShapeType irst = new ItemResponseShapeType();

                irst.BaseShape = DefaultShapeNamesType.AllProperties;

                irst.IncludeMimeContent = false;

                irst.AdditionalProperties = ptufta;

                //restrict the returned items to just items of a specific message class

                PathToUnindexedFieldType MsgClassField = new

                PathToUnindexedFieldType();

                MsgClassField.FieldURI = UnindexedFieldURIType.itemItemClass;

                ConstantValueType MsgClassToGet = new ConstantValueType();

                MsgClassToGet.Value = "IPM.NOTE";

                FieldURIOrConstantType MsgClassConstant = new FieldURIOrConstantType();

                MsgClassConstant.Item = MsgClassToGet;

                IsEqualToType iett = new IsEqualToType();

                iett.FieldURIOrConstant = MsgClassConstant;

                iett.Item = MsgClassField;

                //restrict the returned items greater than a specified date

                PathToUnindexedFieldType StartDateReceivedField = new PathToUnindexedFieldType();

                StartDateReceivedField.FieldURI = UnindexedFieldURIType.itemDateTimeReceived;

                ConstantValueType StartDateReceivedToGet = new ConstantValueType();

                StartDateReceivedToGet.Value = StartDate.ToUniversalTime().ToString();

                FieldURIOrConstantType StartDateReceivedConstant = new FieldURIOrConstantType();

                StartDateReceivedConstant.Item = StartDateReceivedToGet;

                IsGreaterThanOrEqualToType igtett = new IsGreaterThanOrEqualToType();

                igtett.FieldURIOrConstant = StartDateReceivedConstant;

                igtett.Item = StartDateReceivedField;


                //restrict the returned items less than a specified date

                PathToUnindexedFieldType EndDateReceivedField = new PathToUnindexedFieldType();

                EndDateReceivedField.FieldURI = UnindexedFieldURIType.itemDateTimeReceived;

                ConstantValueType EndDateReceivedToGet = new ConstantValueType();

                EndDateReceivedToGet.Value = EndDate.ToUniversalTime().ToString();

                FieldURIOrConstantType EndDateReceivedConstant = new FieldURIOrConstantType();

                EndDateReceivedConstant.Item = EndDateReceivedToGet;

                IsLessThanOrEqualToType iltett = new IsLessThanOrEqualToType();

                iltett.FieldURIOrConstant = EndDateReceivedConstant;

                iltett.Item = EndDateReceivedField;

                AndType at = new AndType();

                at.Items = new SearchExpressionType[3];

                at.Items[0] = igtett;

                at.Items[1] = iltett;

                at.Items[2] = iett;

                //TODO: Uncomment the following line if you want to display only email items from folder

                // If the following line is commented then all items would be returned from folder, 

                // for e.g. Reports, Appointment, Meeting Requests, Contacts etc.


                RestrictionType rt = new RestrictionType();

                rt.Item = at;

                //find the items

                FindItemType fit = new FindItemType();

                fit.ItemShape = irst;

                fit.ParentFolderIds = fita;

                fit.Restriction = rt;

                FindItemResponseType firt = m_esb.FindItem(fit);

                // That's it!  
                ItemType[] list = ((ArrayOfRealItemsType)((FindItemResponseMessageType)firt.ResponseMessages.Items[0]).RootFolder.Item).Items;  // Emails We want to.

                //foreach (ItemType i in list)
                //{
                //    SetIsReadFlag(i.ItemId);//set is read flag.
                //}

                Hashtable ht = new Hashtable();
 
                if (list != null)
                {
                    foreach (ItemType itemOne in list)
                    {
                        ItemType Item = new ItemType();
                        ht.Add(Item.ItemId, Item);
                    }
                }
                return ht;
            }
            catch (Exception e)
            {
                throw new Exception("Error :" + e.Message);
            }
        }

那么得到的Hashtable 则是目标邮件的队列：）