Question

我正在尝试使用SignalR向用户反馈长时间运行过程的进度

我发现了一些.Net Core示例，但最接近的似乎是使用旧版本的SignalR。

我正在努力获取“ ConnectionId”。我已经阅读了很多SO问题和答案，但似乎仍然无法获得正确的价值。

这是我从演示项目中获得的代码：

// Helper functions added for test purposes
function openConnection() {
    progressConnection = new signalR.HubConnectionBuilder().withUrl("/progressDemo").build();
    debugger;
    progressConnection
        .start()
        .then(() => {
            progressConnectionId = progressConnection.connection.connectionId;
            $("#connId").html(progressConnectionId);
            $("#startButton").removeAttr("disabled");
            $("#dropConnectionButton").removeAttr("disabled");
            $("#openConnectionButton").attr("disabled", "disabled");
            $("#msg").html("Connection established");
            console.log("Connection Id: " + progressConnectionId);
        })
        .catch(() => {
            $("#msg").html("Error while establishing connection");
        });
}

错误是未在行上定义“ connectionId”：

progressConnectionId = progressConnection.connection.connectionId;

任何帮助将不胜感激！

Answer 1

我想下面会更有效，因为它不会将连接ID发送到所有已连接的ID ...

public override Task OnConnectedAsync()
{
    //Count++;
    Interlocked.Increment(ref Count);

    base.OnConnectedAsync();
    Clients.All.SendAsync("updateCount", Count);
    Clients.Client(Context.ConnectionId).SendAsync("connected", Context.ConnectionId);
    return Task.CompletedTask;
}

Answer 2

好吧...这很明显，现在我已经解决了：）

我的中心现在看起来像这样：

public override Task OnConnectedAsync()
{
    //Count++;
    Interlocked.Increment(ref Count);

    base.OnConnectedAsync();
    Clients.All.SendAsync("updateCount", Count);
    Clients.All.SendAsync("connected", Context.ConnectionId);
    return Task.CompletedTask;
}

重要的一行是发回连接ID的那一行

Clients.All.SendAsync("connected", Context.ConnectionId);

然后在客户端上，我侦听“ connected”并设置connectionId变量：

progressConnection.on("connected", (connectionId) => {
    progressConnectionId = connectionId;
    $("#connId").html(progressConnectionId);
    $("#startButton").removeAttr("disabled");
    $("#dropConnectionButton").removeAttr("disabled");
    $("#openConnectionButton").attr("disabled", "disabled");
    $("#msg").html("Connection established");
    console.log("Connection Id: " + progressConnectionId);
});

SignalR获取连接ID

2 个答案: