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EWS-无法执行此操作,因为一个或多个项目是新的或未修改的

managed exchangewebservices exception email c#

Armfoot Ludovic Feltz · 技术社区 · 8 年前

关于我之前提出的关于使用 single update to mark as read all the unread emails ,我可以用 ExchangeService.UpdateItems 根据 Jason's answer .

所以我做了相应的修改:

Folder.Bind(Service, WellKnownFolderName.Inbox);

SearchFilter sf = new SearchFilter.SearchFilterCollection(LogicalOperator.And,
    new SearchFilter.IsEqualTo(EmailMessageSchema.IsRead, false));

//ItemView limits the results to numOfMails2Fetch items
FindItemsResults<Item> foundItems = Service.FindItems(WellKnownFolderName.Inbox, sf,
    new ItemView(numOfMails2Fetch));

if (foundItems.TotalCount > 0)
{
    List<EmailMessage> emailsList = new List<EmailMessage>(foundItems.TotalCount);

    foundItems.Items.ToList().ForEach(item =>
    {
        var iEM = item as EmailMessage;
        // update properties BEFORE ADDING
        iEM.IsRead = true;

        //DO NOT UPDATE INSIDE THE LOOP,I.E. DO NOT USE:
        //iEM.Update(ConflictResolutionMode.AutoResolve);

        //add the EmailMessage to the list
        emailsList.Add(iEM);
    });

    // fetches the body of each email and assigns it to each EmailMessage
    Service.LoadPropertiesForItems(emailsList,PropertySet.FirstClassProperties);

    // Batch update all the emails
    ServiceResponseCollection<UpdateItemResponse> response =
      Service.UpdateItems(emailsList,
       WellKnownFolderName.Inbox, ConflictResolutionMode.AutoResolve, 
       MessageDisposition.SaveOnly, null);
    // ABOVE LINE CAUSES EXCEPTION
    return emailsList;
}

请注意,我将 IsRead 归因,将其放置在将项目添加到列表之前。例外情况如下:

无法执行此操作,因为一个或多个项目是新的或未修改

从…起 MSDN's example 它似乎在设置 IsRead(IsRead) 设置为true就足够了,那么为什么不考虑这些项进行批量更新呢?

2 回复 | 直到 7 年前

Jason Johnston 8 年前

乍一看是 LoadPropertiesForItems 在循环外打电话。这可能会通过从服务器加载回值来覆盖您的更改。

Seabizkit 8 年前

这绝不是答案…我只是想看看你是否可以这样格式化它

    Folder.Bind(Service, WellKnownFolderName.Inbox);

    var sf = new SearchFilter.SearchFilterCollection(LogicalOperator.And, new SearchFilter.IsEqualTo(EmailMessageSchema.IsRead, false));

    //ItemView limits the results to numOfMails2Fetch items
    var foundItems = Service.FindItems(WellKnownFolderName.Inbox, sf, new ItemView(numOfMails2Fetch)).ToList();

    // fetches the body of each email and assigns it to each EmailMessage
    Service.LoadPropertiesForItems(foundItems,PropertySet.FirstClassProperties);

    //List<EmailMessage> emailsList = new List<EmailMessage>();
    foreach(var item in foundItems)
    {
      var iEM = item as EmailMessage;
      if(iEM != null)
          iEM.IsRead = true;
      //emailsList.Add(iEM);
    }

    // Batch update all the emails
    var response = Service.UpdateItems(foundItems, WellKnownFolderName.Inbox, ConflictResolutionMode.AutoResolve, MessageDisposition.SaveOnly, null);

    return foundItems;
}