LINQ不提供用于存储文件的byte []数据类型

using (FileStream fs = new FileStream("file.txt", FileMode.Open))
{
    byte[] data = new byte[fs.Length];
    fs.Read(data, 0, (int)fs.Length);
}

using (BinaryReader br = new BinaryReader(File.Open("file.txt", FileMode.Open)))
{
    byte[] data = br.ReadBytes((int)br.BaseStream.Length);
}

using (MemoryStream ms = new MemoryStream())
{
    // 写入数据
    ms.Write(new byte[] { 1, 2, 3 }, 0, 3);

    // 读取数据
    byte[] data = ms.ToArray();
}

using TencentCloud.Common;
using TencentCloud.Cos.V20180528;
using TencentCloud.Cos.V20180528.Models;

// 初始化配置
string secretId = "your_secret_id";
string secretKey = "your_secret_key";
string bucketName = "your_bucket_name";
string region = "your_region";

Credential cred = new Credential { SecretId = secretId, SecretKey = secretKey };
ClientConfig clientConfig = new ClientConfig { Region = region };
CosClient client = new CosClient(cred, clientConfig);

// 上传文件
PutObjectRequest putObjectRequest = new PutObjectRequest();
putObjectRequest.Bucket = bucketName;
putObjectRequest.Key = "file.txt";
putObjectRequest.Body = new MemoryStream(new byte[] { 1, 2, 3 });
PutObjectResponse putObjectResponse = client.PutObject(putObjectRequest);

// 下载文件
GetObjectRequest getObjectRequest = new GetObjectRequest();
getObjectRequest.Bucket = bucketName;
getObjectRequest.Key = "file.txt";
GetObjectResponse getObjectResponse = client.GetObject(getObjectRequest);
byte[] data = getObjectResponse.Body.ReadAllBytes();