.net core SignalR Core如何在服务器端获取连接参数

下面是答案

我正在设置客户端：

const connectionHub = new HubConnectionBuilder()
.withUrl(Constants.URL_WEB_SOCKET + '?token=123')
.build();

但是如何从服务器端获取令牌值呢

public override async Task OnConnectedAsync()
{
    _connectionId = Context.ConnectionId;

    var token = Context.Items["token"]; // this is null

    var token2 = Context.QueryString["token"]; // 'HubCallerContext' does not contain a definition for 'QueryString' 

    await base.OnConnectedAsync();
 }

---

您可以在QueryString中发送参数

在客户端中，声明字符串字典和连接

private Dictionary<string, string> _querystringdata = new Dictionary<string, string>();
private HubConnection _connection;
private const string HubUrl = "your hub url";

if (_connection.State == ConnectionState.Disconnected)
        {

            // Creating the signalrHub proxy
            IHubProxy signalrHub = _connection.CreateHubProxy("SignalrHub");
            Console.WriteLine("Initiating Connection");
            // starting the signalr connection
            _connection.Start().ContinueWith(task =>
            {
                if (task.IsFaulted)
                {
                    Console.WriteLine("There was an error opening the connection:{0}", task.Exception.GetBaseException());

                }
                else
                {
                    Console.WriteLine("Connected to server");

                    //Client methods which server can invoke
                    signalrHub.On<dynamic>("sendMessage", (data) =>
                    {
                        Console.WriteLine("Message:- {0}", data);
                        // do something
                    });
                }
            }).Wait(); 
        }

启动连接

private Dictionary<string, string> _querystringdata = new Dictionary<string, string>();
private HubConnection _connection;
private const string HubUrl = "your hub url";

if (_connection.State == ConnectionState.Disconnected)
        {

            // Creating the signalrHub proxy
            IHubProxy signalrHub = _connection.CreateHubProxy("SignalrHub");
            Console.WriteLine("Initiating Connection");
            // starting the signalr connection
            _connection.Start().ContinueWith(task =>
            {
                if (task.IsFaulted)
                {
                    Console.WriteLine("There was an error opening the connection:{0}", task.Exception.GetBaseException());

                }
                else
                {
                    Console.WriteLine("Connected to server");

                    //Client methods which server can invoke
                    signalrHub.On<dynamic>("sendMessage", (data) =>
                    {
                        Console.WriteLine("Message:- {0}", data);
                        // do something
                    });
                }
            }).Wait(); 
        }

---

如果要在.net core中获取令牌值，可以使用以下代码：

var httpContext = Context.GetHttpContext();
var tokenValue = httpContext.Request.Query["token"];

---

不，Constants.URL\u WEB\u SOCKET是我的WEB套接字URL（即）。上下文不包含QueryString的定义，这是因为您没有在客户端中分配QueryString。我已经更新了答案。希望这有帮助。