SignalR 库在没有调试点的情况下应用 运行 时抛出错误，并且在调试时工作正常

Question

我已经使用 SignalR 创建了一个 .net 核心聊天应用程序，我需要通过单击下一步按钮转到下一个用户。当我单击下一步按钮时，它将触发集线器 class

内的方法 "getRemoteClientNext"

public async Task getRemoteClientNext(string RemoteUserId)
{

      var name = Context.User.Identity.Name;
        var CurrentAppUser = _userManager.FindByNameAsync(name);

        if(RemoteUserId != null) {
            using (var db = _dBContext)
            {
                var remotename = db.Users.Find(RemoteUserId);

                var RemoteUser = db.Connections.Where(c => c.UsersId != CurrentAppUser.Result.Id && c.UsersId != RemoteUserId && c.RemoteConnected == false).AsEnumerable().GroupBy(c => c.UsersId);

                //var remoteConnection = db.Connections.Where(u => u.UsersId == CurrentAppUser.Result.Id || u.UsersId == RemoteUserId).ToList();
                //remoteConnection.ForEach(i => i.RemoteConnected = false);
                var currntUserConnection = db.Connections.Where(u => u.UsersId == CurrentAppUser.Result.Id).AsEnumerable().FirstOrDefault();
                currntUserConnection.RemoteConnected = false;
                db.SaveChanges();

                var RemoteUserConnection = db.Connections.Where(u => u.UsersId == RemoteUserId).AsEnumerable().FirstOrDefault();
                if (RemoteUserConnection != null)
                {
                    RemoteUserConnection.RemoteConnected = false;
                }
                db.SaveChanges();

                var connec = db.Connections.Where(c => c.UsersId == RemoteUserId);

                if (connec.Count() == 0)
                {
                    await Clients.Caller.SendAsync("ClienErrors", "The user is no longer connected");
                }
                else
                {
                    foreach (var connection in connec)
                    {
                        await Clients.Client(connection.ConnectionID).SendAsync("maintainConnectionStatus", "Connecting a remote user......");
                    }

                }
                await Clients.Caller.SendAsync("maintainConnectionStatus", "Connecting a remote user......");

                if (RemoteUser.Count() == 0)
                {
                    await Clients.Caller.SendAsync("maintainConnectionStatus", "Connecting a remote user......");
                }
                else
                {
                    var selectedRemoteUser = RemoteUser.First().ToList();
                    var currentUserConnection = db.Connections.Where(u => u.UsersId == CurrentAppUser.Result.Id).AsEnumerable().FirstOrDefault();
                   // selectedRemoteUser.ForEach(c => c.RemoteConnected = true, c.Remo) ;
                    foreach(Connections con in selectedRemoteUser)
                    {
                        con.RemoteConnected = true;
                        con.RemoteConnectionID = currentUserConnection.ConnectionID;
                        currentUserConnection.RemoteConnectionID = con.ConnectionID;
                    }
                    // var currentUserConnection = db.Connections.Where(u => u.UsersId == CurrentAppUser.Result.Id).AsEnumerable().FirstOrDefault();
                    var RemoteId = selectedRemoteUser.Select(u => u.UsersId).FirstOrDefault();
                    var RemoteName = db.Users.Find(RemoteId);
                    currentUserConnection.RemoteConnected = true;

                    db.SaveChanges();

                    //var RemoteId = selectedRemoteUser.Select(u => u.UsersId).FirstOrDefault();
                    //var RemoteName = db.Users.Find(RemoteId);

                    var connec2 = db.Connections.Where(c => c.UsersId == RemoteId);

                    if (connec2.Count() ==0)
                    {
                        await Clients.Caller.SendAsync("ClienErrors", "The user is no longer connected");
                    }
                    else
                    {
                        foreach (var connection in connec2)
                        {
                            await Clients.Client(connection.ConnectionID).SendAsync("SendRemoteUserId", CurrentAppUser.Result.Id, CurrentAppUser.Result.FirstName);
                        }

                    }
                    await Clients.Caller.SendAsync("SendRemoteUserId", RemoteId, RemoteName.FirstName);
                }
            }
        }
    }

在java脚本中事件就像

document.getElementById("next").addEventListener("click", function (event) {
connection.invoke("getRemoteClientNext", RemoteUserId);
});

我遇到的问题是当我单击下一步按钮时 "getRemoteClientNext" 将被触发并且在调试时工作正常。如果我禁用所有调试点和 运行 应用程序，这将不起作用。但其他功能（如使用集线器发送聊天消息）运行良好。然后我检查控制台，我看到了错误消息

Uncaught (in promise) Error: An unexpected error occurred invoking 'getRemoteClientNext' on the server.
at _this.callbacks. (signalr.js:2088)
at HubConnection.processIncomingData (signalr.js:2182)
at WebSocketTransport.HubConnection.connection.onreceive (signalr.js:1905)
at WebSocket.webSocket.onmessage (signalr.js:3949)

我删除了 SignalR 并尝试再次安装它，但它不起作用，并且在添加客户端库时也只显示 Jquery.SignalR.js 和 Jquery.SignalR.min.js 文件。所以我从另一个项目手动添加了 Signalr.js 文件。

任何人都可以告诉我为什么会发生这种情况是 SignalR 库中的错误

Answer 1

正如 SomeStudent 所建议的，这闻起来像竞争条件。通读 getRemoteClient() 方法中的前几行代码，您缺少 await.

我不能 100% 肯定地说这会解决它，但我敢肯定它可能会成为一个问题，即使这不是罪魁祸首。

// Add await here.
var CurrentAppUser = await _userManager.FindByNameAsync(name);