Question

我正在使用Odata RESTful服务阅读Sharepoint列表数据（＆gt; 20000个条目），详见此处-http：//blogs.msdn.com/b/ericwhite/archive/2010/12/09/getting-started-using -the-OData兼容REST的API - 查询-A-SharePoint的list.aspx

我能够读取数据，但我只获得前1000条记录。我还检查了Sharepoint服务器上的List View Throttling设置为5000。请建议。

更新

@Turker：你的答案是现货!!非常感谢你。我能够在第一次迭代中获得前2000条记录。但是，我在while循环的每次迭代中获得相同的记录。我的代码如下 -

                         ...initial code...
                     int skipCount =0;
  while (((QueryOperationResponse)query).GetContinuation() != null)
                {
                    //query for the next partial set of customers
                    query = dc.Execute<CATrackingItem>(
                        ((QueryOperationResponse)query).GetContinuation().NextLinkUri
                        );

                    //Add the next set of customers to the full list
                    caList.AddRange(query.ToList());

                    var results = from d in caList.Skip(skipCount)
                                  select new
                                  {
                                      Actionable = Actionable,
                                    };  Created = d.Created,

                        foreach (var res in results)
                        {

                            structListColumns.Actionable = res.Actionable;
                            structListColumns.Created= res.Created;
                        }
                         skipCount = caList.Count;
                     }//Close of while loop

Answer 1

您是否在Feed的末尾看到<link rel="next">元素？

例如，如果你看一下

http://services.odata.org/Northwind/Northwind.svc/Customers/

你会看到

<link rel="next" href="http://services.odata.org/Northwind/Northwind.svc/Customers/?$skiptoken='ERNSH'" />

在Feed的末尾，这意味着服务正在实现服务器端分页，您需要发送

http://services.odata.org/Northwind/Northwind.svc/Customers/?$skiptoken='ERNSH'

查询以获取下一组结果。

Answer 2

我没有看到您的代码有任何特别的错误。您可以尝试转储所请求的URL（从代码或使用fiddler之类的东西）来查看客户端是否真的发送相同的查询（从而获得相同的响应）。

在任何情况下，这是一个有效的示例代码（使用示例服务）：

DataServiceContext ctx = new DataServiceContext(new Uri("http://services.odata.org/Northwind/Northwind.svc"));

QueryOperationResponse<Customer> response = (QueryOperationResponse<Customer>)ctx.CreateQuery<Customer>("Customers").Execute();
do
{
    foreach (Customer c in response)
    {
        Console.WriteLine(c.CustomerID);
    }

    DataServiceQueryContinuation<Customer> continuation = response.GetContinuation();
    if (continuation != null)
    {
        response = ctx.Execute(continuation);
    }
    else
    {
        response = null;
    }
} while (response != null);

Answer 3

我遇到了同样的问题，并希望它是一个通用的解决方案。所以我使用GetAlltems方法扩展了DataServiceContext。

    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;
    }

OData服务未返回完整响应

3 个答案: