通过NetFlix odata结果进行分页 [英] paging through NetFlix odata results

问题描述

我正在使用Netflix的odata服务，以更好地了解如何使用odata数据.

I am playing around with the Netflix odata service to get a better understanding of how to consume odata data.

在VS 2010中，我向NetFlix odata服务添加了服务引用.然后，我编写了此代码，该代码仅返回一些数据.

In VS 2010 I added a service reference to the NetFlix odata service. I then wrote this code which returns only some of the data.

        var cat = new NetflixCatalog(new Uri("http://odata.netflix.com/v1/Catalog/"));

        var x = from t in cat.Titles
                where t.ReleaseYear == 2009
                select t;

        foreach (Title title in x)
        {
            ProcessTitle(title);
        }

我查看了为调用生成的uri，并在浏览器中运行了它.它返回的原子feed的末尾有这个元素

I looked at the uri generated for the call and ran it in a browser. The atom feed it returns has this element at the end

  <link rel="next" href="http://odata.netflix.com:20000/v1/Catalog/Titles()/?$filter=ReleaseYear%20eq%202009&amp;$orderby=AverageRating%20desc&amp;$skiptoken=3.9D,'BVqRa'" />

这是一个链接，它将检索下一组数据(由Netflix完成分页).我的问题是如何获取代码来访问下一批数据和下一批数据?

This is the a link that will retrieve the next set of data (paging done by Netflix). My question is how do I get my code to access this next batch of data and the next etc.?

推荐答案

查询可以强制转换为DataServiceQuery，该方法具有一个名为Execute的方法，该方法以QueryOperationResponse的形式返回结果，该方法具有一个GetContinuation方法，该方法返回一个表示对象的延续对象.下一个链接. 遍历所有标题的粗略代码如下所示:

The query can be cast to DataServiceQuery, which has a method called Execute which returns the results as QueryOperationResponse which has a GetContinuation method, which returns a continuation object representing the next link. A rough code to go through all the titles could look like this:

var cat = new NetflixCatalog(new Uri("http://odata.netflix.com/v1/Catalog/"));

var x = from t in cat.Titles
        where t.ReleaseYear == 2009
        select t;
var response = (QueryOperationResponse<Title>)((DataServiceQuery<Title>)x).Execute();

while (true)
{
    foreach (Title title in response)
    {
        Console.WriteLine(title.Name);
    }

    var continuation = response.GetContinuation();
    if (continuation == null)
    {
        break;
    }

    response = cat.Execute(continuation);
}

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