Sharepoint: Binding GridView with SharePoint List (Client Object Model) - asp.net

Question

I want to show a list on an .aspx site. Therefore I have to use the SP client object model.
I found the following tutorial, but this doesn't use the client libraries:
http://social.technet.microsoft.com/wiki/contents/articles/30287.binding-gridview-with-sharepoint-list.aspx
My code so far looks the following:
ClientContext clientContext = GetContext(accessToken);
Web web = clientContext.Web;
clientContext.Load(web);
clientContext.ExecuteQuery();
// Get the email input list.
List inboxList = web.Lists.GetByTitle("InboxList");
Microsoft.SharePoint.Client.ListItemCollection items = inboxList.GetItems(new CamlQuery());
clientContext.Load(inboxList);
clientContext.Load(items, ic => ic.Include(i => i["DisplayName"], i => i["Client_Title"], i => i["HasUniqueRoleAssignments"]));
clientContext.ExecuteQuery();
foreach (Microsoft.SharePoint.Client.ListItem i in items)
{
clientContext.Load(i);
}
clientContext.ExecuteQuery();
oGrid.DataSource = items;
oGrid.DataBind();
But this shows only some "meta data" of the list item collection, see screenshot:
If I use oGrid.DataSource = inboxList; I get an InvalidOperationException because the data source isn't type of IListSource, IEnumerable nor IDataSource.
If I use oGrid.DataSource = inboxList.DataSource; I get an PropertyOrFieldNotInitializedException, but I don't know how to load this attribute (via clientContext.Load it didn't work)?!

Answer 1

I got it - works with following code:
protected void Page_Load(object sender, EventArgs e)
{
...
ClientContext clientContext = GetContext(accessToken);
Web web = clientContext.Web;
clientContext.Load(web);
clientContext.ExecuteQuery();
// Get the email input list.
List inboxList = web.Lists.GetByTitle("InboxList");
Microsoft.SharePoint.Client.ListItemCollection items = inboxList.GetItems(new CamlQuery());
clientContext.Load(inboxList);
clientContext.Load(items);
clientContext.ExecuteQuery();
foreach (Microsoft.SharePoint.Client.ListItem i in items)
{
clientContext.Load(i);
}
clientContext.ExecuteQuery();
oGrid.DataSource = GetInboxListData(inboxList, items);
oGrid.DataBind();
}
else if (!IsPostBack)
{
Response.Write("Could not find a context token.");
return;
}
}
private DataTable GetInboxListData(List inboxList, Microsoft.SharePoint.Client.ListItemCollection items)
{
DataTable dt = new DataTable();
dt.Columns.Add("From");
dt.Columns.Add("To");
dt.Columns.Add("Subject");
dt.Columns.Add("Body");
dt.Columns.Add("Attachments");
dt.Columns.Add("Sent");
DataRow row;
foreach(Microsoft.SharePoint.Client.ListItem item in items)
{
row = dt.Rows.Add();
row["From"] = item["From1"].ToString();
row["To"] = item["To"].ToString();
row["Subject"] = item["Subject1"].ToString();
row["Body"] = item["Body1"].ToString();
row["Attachments"] = item["Attachments"].ToString();
row["Sent"] = item["Sent"].ToString();
}
return dt;
}
This is similar to Retrieve the values from a list to Gridview in SharePoint Webpart? but with client object model methods & objects.