通过asp net core从对象存储中下载文件

"QCloudCosOptions": {
  "SecretId": "YourSecretId",
  "SecretKey": "YourSecretKey",
  "Bucket": "YourBucket",
  "Region": "YourRegion"
}

using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Options;
using QCloud.CosApi.Sdk;

[ApiController]
[Route("api/[controller]")]
public class FileController : ControllerBase
{
    private readonly QCloudCosOptions _cosOptions;

    public FileController(IOptions<QCloudCosOptions> cosOptions)
    {
        _cosOptions = cosOptions.Value;
    }

    [HttpGet("{fileName}")]
    public IActionResult DownloadFile(string fileName)
    {
        var cos = new CosCloud(_cosOptions.SecretId, _cosOptions.SecretKey);
        var result = cos.DownloadFile(_cosOptions.Bucket, fileName);
        
        if (result.Code == 0)
        {
            return File(result.Data, "application/octet-stream", fileName);
        }
        else
        {
            return BadRequest(result.Message);
        }
    }
}

using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;

public class Startup
{
    public IConfiguration Configuration { get; }

    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<QCloudCosOptions>(Configuration.GetSection("QCloudCosOptions"));
        services.AddControllers();
    }

    public void Configure(IApplicationBuilder app)
    {
        app.UseRouting();
        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllers();
        });
    }
}