Distributed caching using Redis in asp.net core.

 To use Redis for distributed caching in ASP.Net core you need to follow below steps:

1. Need to add NuGet package "Microsoft.Extensions.Caching.StackExchangeRedis"
2. Need to configure Redis service via 

            builder.Services.AddStackExchangeRedisCache(option =>{
                string connection = builder.Configuration.GetConnectionString("redis")!;
                option.Configuration = connection; //< == provide connection string;               
            });

     3.configure redis connection in AppSettings.json

"ConnectionStrings": {

    "redis": "localhost:6379"

  }

      4.You need to inject IDistributedCache dependency in Constructor or endpoint.

IDistributedCache provides GetString("StringKey") and SetString("StringKey","StringValue") API, to set your object in Cache you need to serialize it.

app.MapGet("/weatherforecast", (HttpContext httpContext, IDistributedCache cache) =>

            {

                var strCachedForcast = cache.GetString("Forecast");

                if (string.IsNullOrEmpty(strCachedForcast))

                {

                   var cachedForecaste = Enumerable.Range(1, 5).Select(index =>

                       new WeatherForecast

                       {

                           Date = DateOnly.FromDateTime(DateTime.Now.AddDays(index)),

                           TemperatureC = Random.Shared.Next(-20, 55),

                           Summary = summaries[Random.Shared.Next(summaries.Length)]

                       }) .ToArray();

                     strCachedForcast =  JsonSerializer.Serialize< WeatherForecast[]>(cachedForecaste );

                    cache.SetString("Forecast", strCachedForcast);

                }

              return  JsonSerializer.Deserialize<WeatherForecast[]>(strCachedForcast);             

            })

            .WithName("GetWeatherForecast")

            .WithOpenApi();