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20 lines
1.1 KiB
C#
20 lines
1.1 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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namespace CommunityToolkit.Mvvm.Messaging;
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/// <summary>
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/// A <see langword="delegate"/> used to represent actions to invoke when a message is received.
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/// The recipient is given as an input argument to allow message registrations to avoid creating
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/// closures: if an instance method on a recipient needs to be invoked it is possible to just
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/// cast the recipient to the right type and then access the local method from that instance.
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/// </summary>
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/// <typeparam name="TRecipient">The type of recipient for the message.</typeparam>
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/// <typeparam name="TMessage">The type of message to receive.</typeparam>
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/// <param name="recipient">The recipient that is receiving the message.</param>
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/// <param name="message">The message being received.</param>
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public delegate void MessageHandler<in TRecipient, in TMessage>(TRecipient recipient, TMessage message)
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where TRecipient : class
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where TMessage : class;
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