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<title data-react-helmet="true">Pagination | SpotifyAPI-NET</title><meta data-react-helmet="true" name="docsearch:version" content="next"><meta data-react-helmet="true" name="twitter:card" content="summary_large_image"><meta data-react-helmet="true" property="og:title" content="Pagination | SpotifyAPI-NET"><meta data-react-helmet="true" name="description" content="When working with spotify responses, you will often encounter the Paging type."><meta data-react-helmet="true" property="og:description" content="When working with spotify responses, you will often encounter the Paging type."><meta data-react-helmet="true" property="og:url" content="https://johnnycrazy.github.io/SpotifyAPI-NET/docs/next/pagination"><link data-react-helmet="true" rel="shortcut icon" href="/SpotifyAPI-NET/img/favicon.ico"><link data-react-helmet="true" rel="canonical" href="https://johnnycrazy.github.io/SpotifyAPI-NET/docs/next/pagination"><link rel="stylesheet" href="/SpotifyAPI-NET/styles.8a053330.css">
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class="menu__list-item"><a class="menu__link" tabindex="-1" href="/SpotifyAPI-NET/docs/next/example_uwp">UWP</a></li></ul></li></ul></li></ul></div></div></div><main class="docMainContainer_FFX1"><div class="container padding-vert--lg docItemWrapper_1cc7"><div class="row"><div class="col docItemCol_2GOA"><div class="docItemContainer_2cwg"><article><div><span class="badge badge--secondary">Version: next</span></div><header><h1 class="docTitle_1vWb">Pagination</h1></header><div class="markdown"><p>When working with spotify responses, you will often encounter the <code>Paging<T></code> type.</p><blockquote><p>The offset-based paging object is a container for a set of objects. It contains a key called items (whose value is an array of the requested objects) along with other keys like previous, next and limit that can be useful in future calls.</p></blockquote><p>It allows to receive only a subset of all available data and dynamically check if more requests are required. The library supports <code>Paging<T></code> responses in two ways:</p><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_ZqCz" id="paginateall"></a>PaginateAll<a aria-hidden="true" tabindex="-1" class="hash-link" href="#paginateall" title="Direct link to heading">#</a></h2><p><code>PaginateAll</code> will query all remaining elements based on a first page and return all of them in a <code>IList</code>. This method should not be used for a huge amount of pages (e.g <code>Search</code> Endpoint), since it stores every response in memory.</p><div class="mdxCodeBlock_iHAB"><div class="codeBlockContent_32p_"><button type="button" aria-label="Copy code to clipboard" class="copyButton_1BYj">Copy</button><div tabindex="0" class="prism-code language-csharp codeBlock_19pQ"><div class="codeBlockLines_2n9r" style="color:#bfc7d5;background-color:#292d3e"><div class="token-line" style="color:#bfc7d5"><span class="token plain">// we need the first page, every syntax can be used for pagination</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">var page = await spotify.Playlists.CurrentUsers();</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">var page = spotify.Playlists.CurrentUsers();</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">var page = () => spotify.Playlists.CurrentUsers();</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block">
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</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">// allPages will include the first page retrived before</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">var allPages = await spotify.PaginateAll(page);</span></div></div></div></div></div><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_ZqCz" id="paginate"></a>Paginate<a aria-hidden="true" tabindex="-1" class="hash-link" href="#paginate" title="Direct link to heading">#</a></h2><div class="admonition admonition-info alert alert--info"><div class="admonition-heading"><h5><span class="admonition-icon"><svg xmlns="http://www.w3.org/2000/svg" width="14" height="16" viewBox="0 0 14 16"><path fill-rule="evenodd" d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"></path></svg></span>.NET Standard >= 2.1 required</h5></div><div class="admonition-content"></div></div><p><code>Paginate</code> is based on <code>IAsyncEnumerable</code> and streams pages instead of returning them all in one list. This allows to break the fetching early and keeps only 1 page in memory at a time. This method should always be preferred to <code>PaginateAll</code></p><div class="mdxCodeBlock_iHAB"><div class="codeBlockContent_32p_"><button type="button" aria-label="Copy code to clipboard" class="copyButton_1BYj">Copy</button><div tabindex="0" class="prism-code language-csharp codeBlock_19pQ"><div class="codeBlockLines_2n9r" style="color:#bfc7d5;background-color:#292d3e"><div class="token-line" style="color:#bfc7d5"><span class="token plain">// we need the first page, every syntax can be used for pagination</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">var page = await spotify.Playlists.CurrentUsers();</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">var page = spotify.Playlists.CurrentUsers();</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">var page = () => spotify.Playlists.CurrentUsers();</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block">
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</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">await foreach(var item in spotify.Paginate(page))</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">{</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> Console.WriteLine(item.Name);</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> // you can use "break" here!</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">}</span></div></div></div></div></div><p>Some endpoints have nested and/or multiple paginations objects. When requesting the next page, it will not return the actual paging object but rather the root level endpoint object. A good example is the <code>Search</code> endpoint, which contains up to 5 Paging objects. Requesting the next page of the nested <code>Artists</code> paging object will return another <code>Search</code> response, instead of just <code>Artists</code>. You will need to supply a mapper function to the <code>Paginate</code> call, which returns the correct paging object:</p><div class="mdxCodeBlock_iHAB"><div class="codeBlockContent_32p_"><button type="button" aria-label="Copy code to clipboard" class="copyButton_1BYj">Copy</button><div tabindex="0" class="prism-code language-csharp codeBlock_19pQ"><div class="codeBlockLines_2n9r" style="color:#bfc7d5;background-color:#292d3e"><div class="token-line" style="color:#bfc7d5"><span class="token plain">var search = await spotify.Search.Item(new SearchRequest(</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> SearchRequest.Types.All, "Jake"</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">));</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block">
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</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">await foreach(var item in spotify.Paginate(search.Albums, (s) => s.Albums))</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">{</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> Console.WriteLine(item.Name);</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> // you can use "break" here!</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">}</span></div></div></div></div></div><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_ZqCz" id="paginators"></a>Paginators<a aria-hidden="true" tabindex="-1" class="hash-link" href="#paginators" title="Direct link to heading">#</a></h2><p>Via the interface <a href="https://github.com/JohnnyCrazy/SpotifyAPI-NET/blob/master/SpotifyAPI.Web/Clients/Interfaces/IPaginator.cs"><code>IPaginator</code></a>, it can be configured how pages are fetched. It can be configured on a global level:</p><div class="mdxCodeBlock_iHAB"><div class="codeBlockContent_32p_"><button type="button" aria-label="Copy code to clipboard" class="copyButton_1BYj">Copy</button><div tabindex="0" class="prism-code language-csharp codeBlock_19pQ"><div class="codeBlockLines_2n9r" style="color:#bfc7d5;background-color:#292d3e"><div class="token-line" style="color:#bfc7d5"><span class="token plain">var config = SpotifyClientConfig</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> .CreateDefault()</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> .WithPaginator(new YourCustomPaginator());</span></div></div></div></div></div><p>or on method level:</p><div class="mdxCodeBlock_iHAB"><div class="codeBlockContent_32p_"><button type="button" aria-label="Copy code to clipboard" class="copyButton_1BYj">Copy</button><div tabindex="0" class="prism-code language-csharp codeBlock_19pQ"><div class="codeBlockLines_2n9r" style="color:#bfc7d5;background-color:#292d3e"><div class="token-line" style="color:#bfc7d5"><span class="token plain">await foreach(var item in spotify.Paginate(page, new YourCustomPaginator()))</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">{</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> Console.WriteLine(item.Name);</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> // you can use "break" here!</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">}</span></div></div></div></div></div><p>By default, <a href="https://github.com/JohnnyCrazy/SpotifyAPI-NET/blob/master/SpotifyAPI.Web/Clients/SimplePaginator.cs"><code>SimplePaginator</code></a> is used. It fetches pages without any delay.</p></div></article><div class="margin-vert--xl"><div class="row"><div class="col"><a href="https://github.com/JohnnyCrazy/SpotifyAPI-NET/edit/master/SpotifyAPI.Docs/docs/pagination.md" target="_blank" rel="noreferrer noopener"><svg fill="currentColor" height="1.2em" width="1.2em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 40 40" style="margin-right:0.3em;vertical-align:sub"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col text--right"><em><small>Last updated on <time datetime="2020-06-05T17:31:08.000Z" class="docLastUpdatedAt_1sqk">6/5/2020</time> by <strong>Jonas Dellinger</strong></small></em></div></div></div><div class="margin-vert--lg"><nav class="pagination-nav"><div class="pagination-nav__item"><a class="pagination-nav__link" href="/SpotifyAPI-NET/docs/next/proxy"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">« Proxy</div></a></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" href="/SpotifyAPI-NET/docs/next/retry_handling"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Retry Handling »</div></a></div></nav></div></div></div><div class="col col--3"><div class="tableOfContents_TbNY"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#paginateall" class="table-of-contents__link">PaginateAll</a></li><li><a href="#paginate" class="table-of-contents__link">Paginate</a></li><li><a href="#paginators" class="table-of-contents__link">Paginators</a></li></ul></div></div></div></div></main></div></div><footer class="footer footer--dark"><div class="container"><div class="text--center"><div>Copyright © 2020 Jonas Dellinger. Built with Docusaurus.</div></div></div></footer></div>
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