Question

我正在尝试使用以下方法在SharePoint中查询多个任务列表：

SPSiteDataQuery query = new SPSiteDataQuery();
query.Lists = "<Lists ServerTemplate=\"171\" />";

query.Query = string.Concat("<Where>",
                                "<Neq>",
                                    "<FieldRef Name='Checkmark' />",
                                    "<Value Type='Calculated'>Completed</Value>",
                                "</Neq>",
                        "</Where>");

query.Webs = "<Webs Scope=\"Recursive\" />";
query.ViewFields = ViewFields = "<FieldRef Name='Title' /><FieldRef Name='AssignedTo' />";
SPListItemCollection dtTasks = web.GetListItem(query);

return dtTasks;

如果AssignedTo字段设置为UserMulti（https://support.microsoft.com/en-us/kb/2703054），则不起作用。

我以为我可以通过循环列表（按标题硬编码到代码中）来解决这个问题，然后收集列表项结果：

  string[] listCollection = { "List1", "List2" };
  SPListItemCollection collection = null;

  foreach (var list in listCollection)
  {
      SPList spList = web.Lists.TryGetList(list);
      if (spList != null)
      {
          SPQuery qry = new SPQuery();
          qry.Query =
          @"<Where>
                  <And>
                      <Leq>
                          <FieldRef Name='DueDate' />
                          <Value Type='DateTime'>
                              <Today />
                          </Value>
                      </Leq>
                      <Neq>
                          <FieldRef Name='Checkmark' />
                          <Value Type='Calculated'>Completed</Value>
                      </Neq>
                      </And>
              </Where>";
           qry.ViewFields = "<FieldRef Name='Title' /><FieldRef Name='AssignedTo' />";

           collection = spList.GetItems(qry);

      }

  }

  return collection;

但这当然会覆盖每个列表的SPListItemCollection集合。

如何为每次迭代存储列表中的项目？

Answer 1

您可以使用DataTable从SPListItemCollection获取collection.GetDataTable()，然后使用DataTable.Merge()方法将结果合并到一个数据表中。

foreach (var list in listCollection)
{
    var results = new DataTable();
    SPList spList = web.Lists.TryGetList(list);
    if (spList != null)
    {
        SPQuery qry = new SPQuery();
        qry.Query = "...";

        results.Merge(spList.GetItems(qry).GetDataTable());
    }
}
return results;

或者，将您的查询中的SPListItem添加到您在foreach之外宣布的新空SPListItemCollection，如下所示。这样，您就可以直接访问这些项目。

SPListItemCollection result = new SPListItemCollection();
foreach (var list in listCollection)
{   
    ...
    foreach (SPListItem listItem in spList.GetItems(qry)){
        result.Add(listItem);
    }
    result.Update();
}
return result;

在sharepoint中查询多个任务列表

1 个答案: