如何在作为SignalR背板的Redis服务器上缓存数据？

dotnet add package Microsoft.AspNetCore.SignalR.StackExchangeRedis

public void ConfigureServices(IServiceCollection services)
{
    services.AddSignalR()
            .AddStackExchangeRedis("your_redis_connection_string");
}

public class ChatHub : Hub
{
    private readonly IDistributedCache _cache;

    public ChatHub(IDistributedCache cache)
    {
        _cache = cache;
    }

    public async Task SendMessage(string user, string message)
    {
        var chatMessage = new { User = user, Message = message };
        var options = new DistributedCacheEntryOptions
        {
            AbsoluteExpirationRelativeToNow = TimeSpan.FromMinutes(10)
        };

        var serializedMessage = JsonConvert.SerializeObject(chatMessage);
        var key = $"message:{Context.ConnectionId}";

        await _cache.SetStringAsync(key, serializedMessage, options);

        await Clients.All.SendAsync("ReceiveMessage", chatMessage);
    }
}