C#下载网络资源(网页或文件)

var wc = new WebClient();
            //下载网络资源到文件
            wc.DownloadFile("http://www.baidu.com/img/PCtm_d9c8750bed0b3c7d089fa7d55720d6cf.png", "d:\\1.png");
            //下载网络资源到内存
            var bytes = wc.DownloadData("http://www.baidu.com/img/PCtm_d9c8750bed0b3c7d089fa7d55720d6cf.png");
            //下载网络资源到字符串
　　　　　　　wc.Encoding = System.Text.Encoding.UTF8;
　　　　　　　var html = wc.DownloadString("http://www.baidu.com");

 WebClient 已过时，使用 HttpClient：

var client = new HttpClient();
    var response = await client.GetAsync("https://xxxx/master.html");

    if (response.IsSuccessStatusCode)
    {
        var content = await response.Content.ReadAsStringAsync();
        File.WriteAllText(@"C:\Users\...\Desktop\test.txt", content);
    }
    else
    {
        Console.WriteLine($"Error: {response.StatusCode}");
    }