NetworkDoubleBaseGetAvailableSocketAsync 方法

获取本次操作的可用的网络通道，如果是短连接，就重新生成一个新的网络通道，如果是长连接，就复用当前的网络通道。
Obtain the available network channels for this operation. If it is a short connection, a new network channel is regenerated. If it is a long connection, the current network channel is reused.

protected Task<OperateResult<Socket>> GetAvailableSocketAsync()

Protected Function GetAvailableSocketAsync As Task(Of OperateResult(Of Socket))

protected:
Task<OperateResult<Socket^>^>^ GetAvailableSocketAsync()

member GetAvailableSocketAsync : unit -> Task<OperateResult<Socket>>