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<a href="SixLabors.ImageSharp.Web.Synchronization.RefCountedConcurrentDictionary-2.html" title="RefCountedConcurrentDictionary<TKey, TValue>" class="">RefCountedConcurrentDictionary<TKey, TValue></a>
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<div class="article row grid-right">
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<div class="col-md-10">
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<article class="content wrap" id="_content" data-uid="SixLabors.ImageSharp.Web.Middleware.ConcurrentDictionaryExtensions">
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<h1 id="SixLabors_ImageSharp_Web_Middleware_ConcurrentDictionaryExtensions" data-uid="SixLabors.ImageSharp.Web.Middleware.ConcurrentDictionaryExtensions" class="text-break">Class ConcurrentDictionaryExtensions
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</h1>
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<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>
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<a href="https://gist.github.com/davidfowl/3dac8f7b3d141ae87abf770d5781feed">https://gist.github.com/davidfowl/3dac8f7b3d141ae87abf770d5781feed</a></p>
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</div>
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<div class="markdown level0 conceptual"></div>
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<div class="inheritance">
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<h5>Inheritance</h5>
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<div class="level0"><a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object">Object</a></div>
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|||
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<div class="level1"><span class="xref">ConcurrentDictionaryExtensions</span></div>
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|||
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</div>
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<div class="inheritedMembers">
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<h5>Inherited Members</h5>
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<div>
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<a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.equals#system-object-equals(system-object)">Object.Equals(Object)</a>
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</div>
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<div>
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<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>
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|||
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</div>
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<div>
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<a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.gethashcode#system-object-gethashcode">Object.GetHashCode()</a>
|
|||
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</div>
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<div>
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<a class="xref" href="https://docs.microsoft.com/dotnet/api/system.object.gettype#system-object-gettype">Object.GetType()</a>
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|||
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</div>
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<div>
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|||
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<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&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<TKey, TValue>(ConcurrentDictionary<TKey, Task<TValue>>, TKey, Func<TKey, Task<TValue>>)</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<TKey,TValue>)</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<TValue> GetOrAddAsync<TKey, TValue>(this ConcurrentDictionary<TKey, Task<TValue>> dictionary, TKey key, Func<TKey, Task<TValue>> 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><TKey, <a class="xref" href="https://docs.microsoft.com/dotnet/api/system.threading.tasks.task-1">Task</a><TValue>></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<TKey,TValue></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><TKey, <a class="xref" href="https://docs.microsoft.com/dotnet/api/system.threading.tasks.task-1">Task</a><TValue>></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><TValue></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>
|
|||
|
</div>
|
|||
|
|
|||
|
<div class="hidden-sm col-md-2" role="complementary">
|
|||
|
<div class="sideaffix">
|
|||
|
<div class="contribution">
|
|||
|
<ul class="nav">
|
|||
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<li>
|
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<a href="https://github.com/SixLabors/ImageSharp.Web/new/master/apiSpec/new?filename=SixLabors_ImageSharp_Web_Middleware_ConcurrentDictionaryExtensions.md&value=---%0Auid%3A%20SixLabors.ImageSharp.Web.Middleware.ConcurrentDictionaryExtensions%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" class="contribution-link">Improve this Doc</a>
|
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|
|||
|
<li>
|
|||
|
<a href="https://github.com/SixLabors/ImageSharp.Web/blob/12780011d24ffe1a4f821d600c5bb05e8071b5e9/src/ImageSharp.Web/Middleware/ConcurrentDictionaryExtensions.cs/#L14" class="contribution-link">View Source</a>
|
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|
|||
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|
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|
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