从提供商托管的应用程序中获取发布页面上sharepoint内容字段的值

Question

从一个SharePoint插件，提供商托管，使用c#和客户端对象模型，我试图得到一个SharePoint内容字段在发布页面的值。

I try first:

List list = clientContext.Web.Lists.GetByTitle("Pages");
ListItem item = list.GetItemById(7020);
clientContext.Load(list);
clientContext.Load(item, p => p.FieldValues["QP_Question"]);
clientContext.ExecuteQuery();
ViewBag.Question = item.FieldValues["QP_Question"];

我收到这个错误:

Microsoft.SharePoint.Client.InvalidQueryExpressionException
The query expression 'p.ListItem.FieldValues.get_Item("QP_Question")' is not supported.

Then I try:

List list = clientContext.Web.Lists.GetByTitle("Pages");
ListItem item = list.GetItemById(7020);
PublishingPage pp = PublishingPage.GetPublishingPage(clientContext, item);
clientContext.Load(list);
clientContext.Load(item);
clientContext.Load(pp, p => p.ListItem.FieldValues["QP_Question"]);
clientContext.ExecuteQuery();
ViewBag.Question = pp.ListItem.FieldValues["QP_Question"];

还是同样的错误

Answer 1

正确的代码是

List list = clientContext.Web.Lists.GetByTitle("Pages");
ListItem item = list.GetItemById(7020);
clientContext.Load(list);
clientContext.Load(item, p => p["QP_Question"]);
clientContext.ExecuteQuery();
ViewBag.Question = Convert.ToString(item["QP_Question"]);

是p.["QP_Question"]而不是p.FieldValues["QP_Question"]

要查询多个内容字段，请这样做:

clientContext.Load(item, p => p["QP_Question"], p => p["QP_Answer"]);