注意:请求方必须使用RequestAsync(DmtpRouterPackage, CancellationToken)
public Task ResponseFailAsync(
	string msg = "Fail"
)Public Function ResponseFailAsync ( 
	Optional msg As String = "Fail"
) As Taskmember ResponseFailAsync : 
        ?msg : string 
(* Defaults:
        let _msg = defaultArg msg "Fail"
*)
-> Task [缺少 "M:TouchSocket.Dmtp.RouterPackage.RouterPackageEventArgs.ResponseFailAsync(System.String)" 的 <returns> 文档]