Tagging and formatting message text

[gapin]

Is it possible to tag channel? I tried setting in the body message @channel and !channel (according to slack api documentation) but it's not woking.

And also, is it possible to use * (for bold) and _ (for italic) in the body messages when using attachments?

Thanks in advance!

[Texas-E]

You can use the * and _ for editing font in the message. But, I was also unable to tag a channel or specific user

[seangwright]

You can tag with the formatting described here: https://api.slack.com/reference/surfaces/formatting#special-mentions

string text = "A problem has occurred";

client.PostMessage((resp) => {}, "yourChannel", $"<!here> Error: {text}";

The linkNames parameter was deprecated in 2017 or 2018.