C# 使用HttpClient下载文件

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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