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<Type Name="CollectionSynchronizationCallback" FullName="Xamarin.Forms.CollectionSynchronizationCallback">
<TypeSignature Language="C#" Value="public delegate void CollectionSynchronizationCallback(IEnumerable collection, object context, Action accessMethod, bool writeAccess);" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi sealed CollectionSynchronizationCallback extends System.MulticastDelegate" />
<AssemblyInfo>
<AssemblyName>Xamarin.Forms.Core</AssemblyName>
<AssemblyVersion>1.0.0.0</AssemblyVersion>
<AssemblyVersion>1.1.0.0</AssemblyVersion>
<AssemblyVersion>1.2.0.0</AssemblyVersion>
<AssemblyVersion>1.3.0.0</AssemblyVersion>
<AssemblyVersion>1.4.0.0</AssemblyVersion>
<AssemblyVersion>1.5.0.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Base>
<BaseTypeName>System.Delegate</BaseTypeName>
</Base>
<Parameters>
<Parameter Name="collection" Type="System.Collections.IEnumerable" />
<Parameter Name="context" Type="System.Object" />
<Parameter Name="accessMethod" Type="System.Action" />
<Parameter Name="writeAccess" Type="System.Boolean" />
</Parameters>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Docs>
<param name="collection">The collection that was passed to <see cref="M:Xamarin.Forms.BindingBase.EnableCollectionSynchronization" />.</param>
<param name="context">The context or lock object that was passed to <see cref="M:Xamarin.Forms.BindingBase.EnableCollectionSynchronization" />.</param>
<param name="accessMethod">An action that reads or modifies <paramref name="collection" />.</param>
<param name="writeAccess">A value that tells whether write access is required by <paramref name="accessMethod" />.</param>
<summary>Delegate for callback in <see cref="M:Xamarin.Forms.BindingBase.EnableCollectionSynchronization" />.</summary>
<remarks>Application developers implement a <see cref="M:Xamarin.Forms.CollectionSynchronizationCallback" /> method and pass it to the <see cref="M:Xamarin.Forms.BindingBase.EnableCollectionSynchronization" /> method to enable correct multithreaded access to <paramref name="collection" />. After synchronization is enabled, the Xamarin.Forms framework passes <paramref name="accessMethod" /> to the application developer's implementation of <see cref="M:Xamarin.Forms.CollectionSynchronizationCallback" /> each time that the framework needs to modify the collection in a multithreaded environment. The application developer's implementation should decide, based on the <paramref name="context" /> object (which may be merely a locking object or the object on which the collection lives) and the value of the <paramref name="writeAccess" /> parameter, whether or not to <c>lock</c> while calling <paramref name="accessMethod" />.</remarks>
</Docs>
</Type>
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