来自IClientProxy.SendAsync的可能异常(来自Microsoft.AspNetCore.SignalR)

public class MyHub : Hub
{
    public async Task SendMessage(string user, string message)
    {
        try
        {
            // 检查连接状态
            if (Context.ConnectionId == null)
            {
                throw new InvalidOperationException("Connection is not active.");
            }

            // 发送消息
            await Clients.User(user).SendAsync("ReceiveMessage", message);
        }
        catch (HubException ex)
        {
            // 处理 Hub 方法中的异常
            Console.WriteLine($"HubException: {ex.Message}");
        }
        catch (TimeoutException ex)
        {
            // 处理超时异常
            Console.WriteLine($"TimeoutException: {ex.Message}");
        }
        catch (InvalidOperationException ex)
        {
            // 处理无效操作异常
            Console.WriteLine($"InvalidOperationException: {ex.Message}");
        }
        catch (NotSupportedException ex)
        {
            // 处理不支持的操作异常
            Console.WriteLine($"NotSupportedException: {ex.Message}");
        }
        catch (ArgumentException ex)
        {
            // 处理参数异常
            Console.WriteLine($"ArgumentException: {ex.Message}");
        }
    }
}