var services = new ServiceCollection();
services
    .AddLogging(l =>
    {
        l.AddConsole(c =>
        {
            c.LogToStandardErrorThreshold = LogLevel.Trace;
        });
    })
    .AddFastDFSCore(c=>{
        c.ClusterConfigurations.Add(new ClusterConfiguration()
        {
            Name = "Cluster1",
            Trackers = new List<Tracker>()
            {
                    new Tracker("192.168.0.98", 22122)
            }
        })
    })
    .AddFastDFSDotNetty();

var provider = services.BuildServiceProvider();

var client = _provider.GetService<IFastDFSClient>();
var storageNode = await fdfsClient.GetStorageNodeAsync("group1");
var fileId= await fdfsClient.UploadFileAsync(storageNode, @"D:\sample1.txt");

var savePath=Path.Combine(@"D:\sample2.txt");
await client.DownloadFileEx(storageNode, fileId, savePath);