使用 csom c# 更新 sharepoint 中的“创建者”

Question

I want to update "created by" column in sharepoint. For this, i have to do using CSOM only as i do not have sharepoint server dll. I wrote code in this...

ClientContext cc = new ClientContext ("http://sharepoint...");
List list = cc.web.Lists.GetByTitle("sharepointlistname");
cc.Load(list);
ListItem item = list.GetItemById(13);//In this case, i want to update only id=13. I want to know code for all records also.

cc.Load(item);
cc.ExecuteQuery();
item("Created by") = "Dinesh";
item.Update();

When I run above code, am getting this error...

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

Answer 1

The Created By field internal name is Author and it's a Person field, please update like this:

    ClientContext ctx = new ClientContext("http://sp/sites/dev");
    List list = ctx.Web.Lists.GetByTitle("MyList");
    Microsoft.SharePoint.Client.CamlQuery camlQuery = new CamlQuery();
  //CamlQuery to filter items which created in Today  
  camlQuery.ViewXml =
       @"<View>  
    <Query> 
       <Where><Eq><FieldRef Name='Created' /><Value Type='DateTime'><Today /></Value></Eq></Where> 
    </Query> 
    </View>";  
    ListItemCollection items = list.GetItems(camlQuery);
    ctx.Load(items);
    ctx.ExecuteQuery();

    User theUser = ctx.Web.EnsureUser("Contoso\\Jerry");
    ctx.Load(theUser);
    ctx.ExecuteQuery();

    foreach (var item in items)
    {
        item["Editor"] = theUser;
        item["Author"] = theUser;
        item.Update();
    }
    ctx.ExecuteQuery();