Question

我有一个连接到数字秤的系统，我试图使用SignalR将权重传递给其他请求客户。

我的中心看起来像这样：

public class ScaleHub : Hub
{
    private static string ScaleClientId { get; set; }

    // the weight object for the client making the request
    private static Dictionary<string, WeightDTO> scaleWeights =
        new Dictionary<string, WeightDTO>();

    public void RegisterScale()
    {
        ScaleClientId = Context.ConnectionId;
    }

    public WeightDTO GetWeight()
    {
        // clear the scale weight for the client making the request
        scaleWeights[Context.ConnectionId] = null;

        Task updateWeightTask = Clients[ScaleClientId].UpdateWeight(Context.ConnectionId);

        // this doesn't wait :-(
        updateWeightTask.Wait();

        return scaleWeights[Context.ConnectionId];
    }

    public void UpdateWeight(WeightDTO weight, string clientId)
    {
        // update the weight for the client making the request
        scaleWeights[clientId] = weight;
    }
}

客户的重要部分是：

scaleHub.On<string>("UpdateWeight", UpdateWeight);

private void UpdateWeight(string clientId)
{
    // this is replaced with code that talks to the scale hardware
    var newWeight = new WeightDTO(123, WeightUnitTypes.LB);

    scaleHub.Invoke("UpdateWeight", newWeight, clientId).Wait();
}

public Task<WeightDTO> GetWeight()
{
    return scaleHub.Invoke<WeightDTO>("GetWeight");
}

我还是SignalR的新手，所以我不确定我是否正确地做到这一点。

添加Thread.Sleep(2000)而不是updateWeightTask.Wait()可以解决问题，因为它为UpdateWeight的往返调用提供了足够的时间来完成。我不想让我的客户等待2秒才能获得体重。

有什么建议吗？

将数据从呼叫返回给客户端

0 个答案: