59 lines
2.0 KiB
C#
59 lines
2.0 KiB
C#
namespace Unosquare.Swan.Components
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{
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using System;
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/// <summary>
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/// Base class for messages that provides weak reference storage of the sender.
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/// </summary>
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public abstract class MessageHubMessageBase
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: IMessageHubMessage
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{
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/// <summary>
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/// Store a WeakReference to the sender just in case anyone is daft enough to
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/// keep the message around and prevent the sender from being collected.
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/// </summary>
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private readonly WeakReference _sender;
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/// <summary>
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/// Initializes a new instance of the <see cref="MessageHubMessageBase"/> class.
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/// </summary>
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/// <param name="sender">The sender.</param>
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/// <exception cref="System.ArgumentNullException">sender.</exception>
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protected MessageHubMessageBase(object sender)
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{
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if (sender == null)
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throw new ArgumentNullException(nameof(sender));
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_sender = new WeakReference(sender);
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}
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/// <summary>
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/// The sender of the message, or null if not supported by the message implementation.
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/// </summary>
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public object Sender => _sender?.Target;
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}
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/// <summary>
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/// Generic message with user specified content.
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/// </summary>
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/// <typeparam name="TContent">Content type to store.</typeparam>
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public class MessageHubGenericMessage<TContent>
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: MessageHubMessageBase
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{
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/// <summary>
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/// Initializes a new instance of the <see cref="MessageHubGenericMessage{TContent}"/> class.
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/// </summary>
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/// <param name="sender">The sender.</param>
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/// <param name="content">The content.</param>
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public MessageHubGenericMessage(object sender, TContent content)
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: base(sender)
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{
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Content = content;
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}
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/// <summary>
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/// Contents of the message.
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/// </summary>
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public TContent Content { get; protected set; }
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}
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} |