SharePoint oData API Only Returns 1000 Records - sharepoint

Question

I am trying to query a SharePoint 2013 list using the Rest API for all items in the list. The problem is it only returns 1000 records max and I need to get all of the records. I am using the oData v4 API and auto generated service references for the site.
I figured it out: I am including the question and answer here in case anyone else needs it.

Answer 1

I created an extension method called SelectAll() that returns all of the records for a given query.
public static List<T> SelectAll<T>(this DataServiceContext dataContext, IQueryable<T> query)
{
var list = new List<T>();
DataServiceQueryContinuation<T> token = null;
var response = ((DataServiceQuery)query).Execute() as QueryOperationResponse<T>;
do
{
if (token != null)
{
response = dataContext.Execute(token);
}
list.AddRange(response);
} while ((token = response.GetContinuation()) != null);
return list;
}
You use it by calling dataContext.SelectAll(query);

Answer 2

I had the same problem, and wanted it to be a generic solution without providing the query. I do use the EntitySetAttribute to determine the listname.
public static List<T> GetAlltems<T>(this DataServiceContext context)
{
return context.GetAlltems<T>(null);
}
public static List<T> GetAlltems<T>(this DataServiceContext context, IQueryable<T> queryable)
{
List<T> allItems = new List<T>();
DataServiceQueryContinuation<T> token = null;
EntitySetAttribute attr = (EntitySetAttribute)typeof(T).GetCustomAttributes(typeof(EntitySetAttribute), false).First();
// Execute the query for all customers and get the response object.
DataServiceQuery<T> query = null;
if (queryable == null)
{
query = context.CreateQuery<T>(attr.EntitySet);
}
else
{
query = (DataServiceQuery<T>) queryable;
}
QueryOperationResponse<T> response = query.Execute() as QueryOperationResponse<T>;
// With a paged response from the service, use a do...while loop
// to enumerate the results before getting the next link.
do
{
// If nextLink is not null, then there is a new page to load.
if (token != null)
{
// Load the new page from the next link URI.
response = context.Execute<T>(token);
}
allItems.AddRange(response);
}
// Get the next link, and continue while there is a next link.
while ((token = response.GetContinuation()) != null);
return allItems;
}