Updating EndDate causes “Invalid data has been used to update the list item”

问题

Here is the full error:

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

I am basically try to update a Calendar Event in Sharepoint.

First I get the following.

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();

Followed by a loop:

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();

            }

Then last:

clientContext.ExecuteQuery();

If I try to update any other item[x] in the ListItem works fine. When I try to update the "EndDate". I get the following error:

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:

回答1:

Sharepoint is wired like this. When you update the EndDate by itself, it will give you an error listed above. The solution is to Update the EventDate and EndDate together.

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

来源：https://stackoverflow.com/questions/10079961/updating-enddate-causes-invalid-data-has-been-used-to-update-the-list-item

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sharepoint

sharepoint-2010