如何查找收件箱中是否存在文件夹，如果不存在则创建

Question

刚开始在Exchange 2010上使用Exchange Webservices 1.1。我找不到有关如何查找特定文件夹的示例，如果不存在，请创建它。这是怎么做到的？

Answer 1

经过几天的网上摆弄和研究后我发现了：

FolderView fv = new FolderView(10);

var findFoldersResults = service.FindFolders(
    WellKnownFolderName.Inbox,
    new SearchFilter.SearchFilterCollection(
        LogicalOperator.Or,
        new SearchFilter.ContainsSubstring(FolderSchema.DisplayName, "ERROR"), new SearchFilter.ContainsSubstring(FolderSchema.DisplayName, "ARCHIVE")),
    fv);

foreach (var folder in findFoldersResults)
{
    if (folder is Folder)
    {
        if (folder.DisplayName.ToUpper() == "ARCHIVE")
        {
            archiveFolderID = folder.Id;
        }
        else if (folder.DisplayName.ToUpper() == "ERROR")
        {
            errorFolderID = folder.Id;
        }

    }
}
//if archive folder not found create and assign the variable to the folderID
if (archiveFolderID == null)
{
    Folder folder = new Folder(service);
    folder.DisplayName = "ARCHIVE";
    folder.Save(WellKnownFolderName.Inbox);
    archiveFolderID = folder.Id;
}
//if error folder not found create and assign the variable to the folderID
if (errorFolderID == null)
{
    Folder folder = new Folder(service);
    folder.DisplayName = "ERROR";
    folder.Save(WellKnownFolderName.Inbox);
    errorFolderID = folder.Id;
}