practical-aspnetcore/projects/caching/caching-3/Program.cs at net8.0 · dodyg/practical-aspnetcore · GitHub

Name: practical-aspnetcore/projects/caching/caching-3/Program.cs at net8.0 · dodyg/practical-aspnetcore · GitHub
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usingMicrosoft.Extensions.Caching.Memory;
usingMicrosoft.Extensions.FileProviders;

stringCACHE_KEY="MyCache";

varbuilder=WebApplication.CreateBuilder();
builder.Services.AddMemoryCache();
builder.Logging.ClearProviders();
builder.Logging.AddConsole();
builder.Logging.AddFilter((provider,category,logLevel)=>!category.Contains("Microsoft.AspNetCore"));

varapp=builder.Build();
varfileProvider=newPhysicalFileProvider(app.Environment.ContentRootPath);
app.Run(async context =>
{
varlog=context.RequestServices.GetService<ILoggerFactory>().CreateLogger("app");

varcache=context.RequestServices.GetService<IMemoryCache>();
vargreeting=cache.Get(CACHE_KEY)asstring;

//There is no existing cache, add one
if(string.IsNullOrWhiteSpace(greeting))
{
varoptions=newMemoryCacheEntryOptions()
.SetAbsoluteExpiration(TimeSpan.FromSeconds(5))
.RegisterPostEvictionCallback((objectkey,objectvalue,EvictionReasonreason,objectstate)=>
{
if(state==null)
log.LogInformation("State is null");

log.LogInformation($"Key '{key}' with value '{value}' was removed because of '{reason}'");
});
//You can also use .SetSlidingExpiration

varmessage="Hello "+DateTimeOffset.UtcNow.ToString();
cache.Set(CACHE_KEY,message,options);
greeting=message;
}

context.Response.Headers.Append("Content-Type","text/html");
awaitcontext.Response.WriteAsync(@"
 <html>
 <body>
 <p>
 The cache is set to expire in 5 seconds. Wait until 5 seconds then refresh this page. Check your console log to see the post eviction message event.
 </p>
 <p>
 If you don't refresh this page, the eviction message won't be posted at the console. Here's <a href=""https://github.com/aspnet/Caching/issues/353#issuecomment-333956801"">an explanation</a> for this behavior.
 </p>
 </body>
 </html>");
});

app.Run();