如何在C＃中检索交换Web服务中的2000多个邮件项目 [英] How to retrieve more than 2000 mail items in exchange web service in C#

问题描述

大家好，

我有一个包含2068个邮件的收件箱。我需要检索所有2068封邮件。但根据我的代码，这会跳过1000封邮件，即最初它显示总计数为2068并在第一个循环中检索1000封邮件并显示计数为1000（pagesize = 1000）但在第二个循环中它显示计数为68并跳过1000邮件和NextPageOffset为空。我做错了什么？



我的尝试：

  int  pageSize =  1000 ; 
 FindFoldersResults findFolderItems = service.FindFolders（WellKnownFolderName.Inbox，sourceFolderFilter， new  FolderView（ 1 ） ）; 
 ItemView view =  new  ItemView（pageSize）; 
  do  
 {
 findMailItems = service.FindItems（findFolderItems.Folders [ 0 ].Id,searchFilter，view）; 
  if （findMailItems.TotalCount >   0 ）
 {
  foreach （ var  item  in  findMailItems.Items）
 {
 item.Move（folderId）; 
} 
} 
 view.Offset = findMailItems.NextPageOffset.Value; 
} 
  while （findMailItems.MoreAvailable）; 

解决方案

如果你考虑你的代码在做什么，问题应该是显而易见的：当你试图检索它们时你正在移动消息。



考虑一个包含三条消息的简化示例，一次移动一条消息：

1. 收件箱： [A，B，C] ;
2. 检索邮件 0 ：A;
3. 将A移至另一个文件夹;
4. 收件箱： [B，C] ;
5. 检索邮件 1 ：C
6. 将C移至另一个文件夹;
7. 收件箱： [B]
8. 检索邮件 2 ：错误

与修改集合的任何循环一样，你需要调整索引来考虑你的变化。

 做 
 {
 findMailItems = service.FindItems（findFolderItems.Folders [ 0 ]。Id，searchFilter，view）; 
  if （findMailItems.TotalCount >   0 ）
 {
  foreach （ var  item  in  findMailItems.Items）
 {
 item.Move（folderId）; 
} 
} 
 
  //  注意：不要更改view.Offset here！ 
} 
  while （findMailItems.MoreAvailable）; 

Hello all,
I have an inbox that contains 2068 mail items. I need to retreive all 2068 mails. But as per my code, this skips 1000 mails i.e initially it shows total count as 2068 and retrieves 1000 mails in the first loop and shows count as 1000 (pagesize=1000) but in second loop it shows the count as 68 and skips the 1000 mails and NextPageOffset is null. What am i doing wrong ?

What I have tried:

int pageSize = 1000;
FindFoldersResults findFolderItems = service.FindFolders(WellKnownFolderName.Inbox, sourceFolderFilter, new FolderView(1));
ItemView view = new ItemView(pageSize);
do
{
findMailItems = service.FindItems(findFolderItems.Folders[0].Id, searchFilter, view);                                
if (findMailItems.TotalCount > 0)
{
    foreach (var item in findMailItems.Items)
    {
         item.Move(folderId);
    }
}
view.Offset = findMailItems.NextPageOffset.Value;
}
 while (findMailItems.MoreAvailable);

解决方案

If you consider what your code is doing, the problem should be obvious: you're moving the messages whilst you're trying to retrieve them.

Consider a simplified example with three messages, moving one at a time:

1. Inbox: [ "A", "B", "C" ];
2. Retrieve message 0: "A";
3. Move "A" to another folder;
4. Inbox: [ "B", "C" ];
5. Retrieve message 1: "C"
6. Move "C" to another folder;
7. Inbox: ["B"]
8. Retrieve message 2: Error

As with any loop which modifies the collection it's iterating over, you need to adjust the index to account for your changes.

do
{
    findMailItems = service.FindItems(findFolderItems.Folders[0].Id, searchFilter, view);
    if (findMailItems.TotalCount > 0)
    {
        foreach (var item in findMailItems.Items)
        {
            item.Move(folderId);
        }
    }
    
    // NB: Don't change the view.Offset here!
}
while (findMailItems.MoreAvailable);

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