本章讲述：如何在C#中使用HttpClient直接从阿里云OSS下载文件。

步骤1: 添加必要的命名空间

using System;
using System.IO;
using System.Net.Http;

步骤2: 创建下载方法

  以下是使用HttpClient下载文件的示例代码：

public class OssDownloader
{
	//downloadPath 是完整的下载地址
    public void DownloadFileFromOss(string localFilePath, string downloadPath)
    {
        using (var client = new HttpClient())
        {
            try
            {
                var url = downloadPath;
                Console.WriteLine($"Downloading file from: {url}");
                // 发送GET请求下载文件
                HttpResponseMessage response = client.GetAsync(url).Result;
                if (response.IsSuccessStatusCode)
                {
                    byte[] contentBytes = response.Content.ReadAsByteArrayAsync().Result;
                    File.WriteAllBytes(localFilePath, contentBytes);
                    Console.WriteLine($"File downloaded successfully to: {localFilePath}");
                }
                else
                {
                    Console.WriteLine($"Failed to download file. Status code: {response.StatusCode}");
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error downloading file: {ex.Message}");
            }
        }
    }

    public static void Main(string[] args)
    {
        OssDownloader downloader = new OssDownloader();
        string localFilePath = @"C:\path\to\local\file.txt";
        string downloadFilePath = "your download file";//实际的下载地址
        downloader.DownloadFileFromOss(localFilePath，downloadFilePath);
    }
}

注意事项

  确保你的阿里云账号有权限访问指定的Bucket和对象。

  处理异常情况，确保资源正确释放。

  使用HttpClient时要注意异步编程模型（如使用async/await），以避免阻塞主线程。

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