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Chat SDKs .NET v4
Chat SDKs .NET
Chat SDKs
.NET
Version 4

Retrieve number of members who haven't read a message

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Using the GetUnreadMemberCount() method, you can get the number of members who haven't read a specific message in a group channel. To get the most up-to-date value, the channel should first be updated through MarkAsRead() before calling GetUnreadMemberCount().

// Call the markAsRead() method when the current user views unread messages in a group channel.
groupChannel.MarkAsRead((inError) =>
{
    if (inError != null)
        return; // Handle error.
});

// To listen to an update from all the other channel members' client apps, 
// implement OnReadStatusUpdated() with actions to do when notified.
SbGroupChannelHandler groupChannelHandler = new SbGroupChannelHandler
{
    OnReadStatusUpdated = (inGroupChannel) =>
    {
        if (currentChannel.Url == inGroupChannel.Url)
        {
            int unreadMemberCount = inGroupChannel.GetUnreadMemberCount(message);
            if (unreadMemberCount <= 0)
            {
                // All members have read the message.
            }
            else
            {
                // Some of members haven't read the message yet.
            }
        }
    }
};

SendbirdChat.GroupChannel.AddGroupChannelHandler(UNIQUE_HANDLER_ID, groupChannelHandler);