ASPNET Caching — Response and Output Caching in ASP.NET Core

DodaTech Updated 2026-06-28 1 min read

In this tutorial, you'll learn about ASPNET Caching. We cover key concepts, practical examples, and best practices to help you understand and apply this topic effectively.

ASP.NET Core provides multiple caching layers from in-memory to distributed caching for improving application performance.

// Output caching (ASP.NET Core 7+)
builder.Services.AddOutputCache(options =>
{
    options.AddBasePolicy(policy => policy.Expire(TimeSpan.FromMinutes(10)));
    options.AddPolicy("ScanResults", policy =>
        policy.Expire(TimeSpan.FromMinutes(5))
              .SetVaryByQuery("fileId")
              .Tag("scans"));
});

app.UseOutputCache();

[OutputCache(PolicyName = "ScanResults")]
public async Task<IActionResult> GetScanResult(string fileId)
{
    var result = await _scanService.GetResultAsync(fileId);
    return Ok(result);
}

// Cache invalidation
// app.MapPost("/api/scan", async () => { ... }).CacheOutput(x => x.NoCache());

Output caching reduces server load by serving cached responses for identical requests.

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