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<article class="content wrap" id="_content" data-uid="SixLabors.ImageSharp.Web.Middleware.ConcurrentDictionaryExtensions">
<h1 id="SixLabors_ImageSharp_Web_Middleware_ConcurrentDictionaryExtensions" data-uid="SixLabors.ImageSharp.Web.Middleware.ConcurrentDictionaryExtensions" class="text-break">Class ConcurrentDictionaryExtensions
</h1>
<div class="markdown level0 summary"><p>Extensions used to manage asynchronous access to the <a class="xref" href="SixLabors.ImageSharp.Web.Middleware.ImageSharpMiddleware.html">ImageSharpMiddleware</a>
<a href="https://gist.github.com/davidfowl/3dac8f7b3d141ae87abf770d5781feed">https://gist.github.com/davidfowl/3dac8f7b3d141ae87abf770d5781feed</a></p>
</div>
<div class="markdown level0 conceptual"></div>
<div class="inheritance">
<h5>Inheritance</h5>
<div class="level0"><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object">Object</a></div>
<div class="level1"><span class="xref">ConcurrentDictionaryExtensions</span></div>
</div>
<div class="inheritedMembers">
<h5>Inherited Members</h5>
<div>
<a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.equals#system-object-equals(system-object)">Object.Equals(Object)</a>
</div>
<div>
<a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.equals#system-object-equals(system-object-system-object)">Object.Equals(Object, Object)</a>
</div>
<div>
<a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.gethashcode#system-object-gethashcode">Object.GetHashCode()</a>
</div>
<div>
<a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.gettype#system-object-gettype">Object.GetType()</a>
</div>
<div>
<a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.memberwiseclone#system-object-memberwiseclone">Object.MemberwiseClone()</a>
</div>
<div>
<a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.referenceequals#system-object-referenceequals(system-object-system-object)">Object.ReferenceEquals(Object, Object)</a>
</div>
<div>
<a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.tostring#system-object-tostring">Object.ToString()</a>
</div>
</div>
<h6><strong>Namespace</strong>: <a class="xref" href="SixLabors.ImageSharp.Web.Middleware.html">SixLabors.ImageSharp.Web.Middleware</a></h6>
<h6><strong>Assembly</strong>: SixLabors.ImageSharp.Web.dll</h6>
<h5 id="SixLabors_ImageSharp_Web_Middleware_ConcurrentDictionaryExtensions_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static class ConcurrentDictionaryExtensions</code></pre>
</div>
<h3 id="methods">Methods
</h3>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/SixLabors/ImageSharp.Web/new/master/apiSpec/new?filename=SixLabors_ImageSharp_Web_Middleware_ConcurrentDictionaryExtensions_GetOrAddAsync__2_System_Collections_Concurrent_ConcurrentDictionary___0_System_Threading_Tasks_Task___1_____0_System_Func___0_System_Threading_Tasks_Task___1___.md&amp;value=---%0Auid%3A%20SixLabors.ImageSharp.Web.Middleware.ConcurrentDictionaryExtensions.GetOrAddAsync%60%602(System.Collections.Concurrent.ConcurrentDictionary%7B%60%600%2CSystem.Threading.Tasks.Task%7B%60%601%7D%7D%2C%60%600%2CSystem.Func%7B%60%600%2CSystem.Threading.Tasks.Task%7B%60%601%7D%7D)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
</span>
<span class="small pull-right mobile-hide">
<a href="https://github.com/SixLabors/ImageSharp.Web/blob/12780011d24ffe1a4f821d600c5bb05e8071b5e9/src/ImageSharp.Web/Middleware/ConcurrentDictionaryExtensions.cs/#L27">View Source</a>
</span>
<a id="SixLabors_ImageSharp_Web_Middleware_ConcurrentDictionaryExtensions_GetOrAddAsync_" data-uid="SixLabors.ImageSharp.Web.Middleware.ConcurrentDictionaryExtensions.GetOrAddAsync*"></a>
<h4 id="SixLabors_ImageSharp_Web_Middleware_ConcurrentDictionaryExtensions_GetOrAddAsync__2_System_Collections_Concurrent_ConcurrentDictionary___0_System_Threading_Tasks_Task___1_____0_System_Func___0_System_Threading_Tasks_Task___1___" data-uid="SixLabors.ImageSharp.Web.Middleware.ConcurrentDictionaryExtensions.GetOrAddAsync``2(System.Collections.Concurrent.ConcurrentDictionary{``0,System.Threading.Tasks.Task{``1}},``0,System.Func{``0,System.Threading.Tasks.Task{``1}})">GetOrAddAsync&lt;TKey, TValue&gt;(ConcurrentDictionary&lt;TKey, Task&lt;TValue&gt;&gt;, TKey, Func&lt;TKey, Task&lt;TValue&gt;&gt;)</h4>
<div class="markdown level1 summary"><p>Provides an alternative to <a class="xref" href="https://docs.microsoft.com/dotnet/api/system.collections.concurrent.concurrentdictionary-2.getoradd#system-collections-concurrent-concurrentdictionary-2-getoradd(-0-system-func((-0-1)))">GetOrAdd(TKey, Func&lt;TKey,TValue&gt;)</a> specifically for asynchronous values. The factory method will only run once.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static async Task&lt;TValue&gt; GetOrAddAsync&lt;TKey, TValue&gt;(this ConcurrentDictionary&lt;TKey, Task&lt;TValue&gt;&gt; dictionary, TKey key, Func&lt;TKey, Task&lt;TValue&gt;&gt; valueFactory)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.collections.concurrent.concurrentdictionary-2">ConcurrentDictionary</a>&lt;TKey, <a class="xref" href="https://docs.microsoft.com/dotnet/api/system.threading.tasks.task-1">Task</a>&lt;TValue&gt;&gt;</td>
<td><span class="parametername">dictionary</span></td>
<td><p>The <a class="xref" href="https://docs.microsoft.com/dotnet/api/system.collections.concurrent.concurrentdictionary-2">ConcurrentDictionary&lt;TKey,TValue&gt;</a>.</p>
</td>
</tr>
<tr>
<td><span class="xref">TKey</span></td>
<td><span class="parametername">key</span></td>
<td><p>The key of the element to add.</p>
</td>
</tr>
<tr>
<td><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.func-2">Func</a>&lt;TKey, <a class="xref" href="https://docs.microsoft.com/dotnet/api/system.threading.tasks.task-1">Task</a>&lt;TValue&gt;&gt;</td>
<td><span class="parametername">valueFactory</span></td>
<td><p>The function used to generate a value for the key</p>
</td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.threading.tasks.task-1">Task</a>&lt;TValue&gt;</td>
<td><p>The value for the key. This will be either the existing value for the key if the
key is already in the dictionary, or the new value for the key as returned by valueFactory
if the key was not in the dictionary.</p>
</td>
</tr>
</tbody>
</table>
<h5 class="typeParameters">Type Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="parametername">TKey</span></td>
<td><p>The type of the key.</p>
</td>
</tr>
<tr>
<td><span class="parametername">TValue</span></td>
<td><p>The value for the dictionary.</p>
</td>
</tr>
</tbody>
</table>
</article>
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