sharepoint - 更新 EndDate 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.

我基本上是尝试更新 Sharepoint 中的日历事件。

首先我得到以下信息。

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();

接着是一个循环:

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 ListItem 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:\Projects\DisplayOnCalendarUtility\DisplayOnCalendarUtility\Program.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 是这样连线的。当你自己更新 EndDate 时，它​​会给你一个上面列出的错误。解决方案是同时更新 EventDate 和 EndDate。

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