七牛-资源列举list(c#)

**package sdk_study;import java.io.IOException;import com.qiniu.storage.BucketManager;import com.qiniu.storage.model.FileListing;import com.qiniu.util.Auth;import com.qiniu.util.UrlSafeBase64;import okhttp3.MediaType;import okhttp3.OkHttpClient;import okhttp3.Request;import okhttp3.RequestBody;import okhttp3.Response;public class list {    String ak = "";    String sk = "";    public Auth auth = Auth.create(ak, sk);    public static final MediaType JSON = MediaType.parse("application/json; charset=utf-8");    public void listres() throws IOException {        BucketManager bucketManager = new BucketManager(auth);        FileListing fl =  bucketManager.listFiles("空间名", "前缀", null,500, null);        //前缀为空-》全部列举        for(int i=0;i<fl.items.length;i++)        {            System.out.println(fl.items[i].key);        }    }    public static void main(String[] args) throws IOException     {        new list().listres();    }**}