Add datetime property to "MetaInfo" field using SharePoint 2013 CSOM

Question

When uploading a file along with metadata using SharePoint FP RPC (using the "method= put document") it allows me to properly add datetime properties. My metainfo looks like this:
"MetaInfo":"...MyCustomDate:TW|05 Jan 2015 12:58:31 -0000\r\n..."
Then later on, when I try to update "MyCustomDate" property from the "MetaInfo" field using CSOM, it fails while updating it. (In this case I am using CSOM because I am updating some more fields and I want to avoid extra round-trips)
After that update my metainfo looks like this:
"MetaInfo":"...MyCustomDate:FX|0x01d028e7|0x4d1c4880\r\n..."
Does anyone know why?, is there any workaround?
Thanks

Answer 1

Hi,
If you want to add datetime property to "MetaInfo" field using SharePoint 2013 CSOM, the following code snippet for your reference:
using (ClientContext context = new ClientContext("http://yourserver/"))
context.Credentials = new NetworkCredential("user", "password", "domain");
List list = context.Web.Lists.GetByTitle("Documents");
ListItem oListItem = list.GetItemById(1);
oListItem["MetaInfo"] = "MyCustomDate:TW|08 Jan 2015 12:58:31 -0000";
oListItem.Update();
context.ExecuteQuery();
Best Regards
Dennis Guo
TechNet Community Support