更新结束日期会导致"Invalid data has been used to update the list item"

Question

这是完整的错误：

Invalid data has been used to update the list item. The field you are trying to update may be read only.

我基本上是在尝试更新Sharepoint中的日历事件。

首先，我得到以下内容。

ClientContext clientContext = new ClientContext(deptUrl);
Web web = clientContext.Web;
List list = web.Lists.GetByTitle(deptCal);
clientContext.Load(list);
CamlQuery query = new CamlQuery();
query.ViewXml = "<View><Query><Where><IsNull><FieldRef Name='EndDate' /></IsNull></Where></Query><RowLimit>1</RowLimit></View>";
ListItemCollection allEventIds = list.GetItems(query);
clientContext.Load(allEventIds, 
items => items.Include(
     item => item["EventID"],
     item => item["EventDate"],
     item => item["EndDate"]
));
clientContext.ExecuteQuery();

后跟一个循环：

foreach (var item in allEventIds)
{
   Console.Write("EventId: {0} StartDate: {1}n", item.FieldValues["EventID"], item.FieldValues["EventDate"]);
                if (item.FieldValues.ContainsKey("EventDate"))
                {
                    object objValue = item.FieldValues["EventDate"];
                    if (objValue != null)
                    {
                        clientContext.Load(item);                        
                        DateTime endDate = DateTime.Parse(objValue.ToString());
                        item["EndDate"] = endDate; //Updated this!
                    }
                }
                item.Update();
            }

然后最后：

clientContext.ExecuteQuery();

如果我尝试更新列表项中的任何其他项目[x]工作正常。当我尝试更新"结束日期"时。我收到以下错误：

Microsoft.SharePoint.Client.ServerException was unhandled
  Message="Invalid data has been used to update the list item. The field you are trying to update may be read only."
  Source="Microsoft.SharePoint.Client.Runtime"
  ServerErrorCode=-2147024809
  ServerErrorTypeName="System.ArgumentException"
  ServerStackTrace=""
  StackTrace:
       at Microsoft.SharePoint.Client.ClientRequest.ProcessResponseStream(Stream responseStream)
       at Microsoft.SharePoint.Client.ClientRequest.ProcessResponse()
       at Microsoft.SharePoint.Client.ClientRequest.ExecuteQueryToServer(ChunkStringBuilder sb)
       at Microsoft.SharePoint.Client.ClientRequest.ExecuteQuery()
       at Microsoft.SharePoint.Client.ClientRuntimeContext.ExecuteQuery()
       at Microsoft.SharePoint.Client.ClientContext.ExecuteQuery()
       at DisplayOnCalendarUtility.Program.Main(String[] args) in C:ProjectsDisplayOnCalendarUtilityDisplayOnCalendarUtilityProgram.cs:line 61
       at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: 

Answer 1

Sharepoint 是这样连接的。当您自行更新结束日期时，它将为您提供上面列出的错误。解决方案是同时更新事件日期和结束日期。

DateTime startDate = DateTime.Parse(objValue.ToString());
item["EventDate"] = startDate;
item["EndDate"] = startDate; //Or Any other date you want to set to.

http://social.msdn.microsoft.com/Forums/en-US/sharepointdevelopment/thread/31e84d74-3ea8-44df-86dc-2dc62381ab3b/#33ad370b-b137-4c2f-bcaa-d6f5c714f4dd