How to retrieve more than 2000 mail items in exchange web service in C#

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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:

C#

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);

Posted 13-Feb-17 0:26am

User1454

Updated 13-Feb-17 9:57am

Garth J Lancaster

v2

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Richard Deeming · Answer 1 · 2017-02-13T09:57:00

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:

Inbox: [ "A", "B", "C" ];
Retrieve message 0: "A";
Move "A" to another folder;
Inbox: [ "B", "C" ];
Retrieve message 1: "C"
Move "C" to another folder;
Inbox: ["B"]
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.

C#

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);