使用TinyPNG提供的API，对图片进行压缩（C#）

using System;
using System.Net;
using System.Text;
using System.IO;
class Program
{
    static void Main()
    {
        Console.WriteLine("请输入TinyPng.com的API KEY,获取地址:https://tinypng.com/developers");
        string key = Console.ReadLine();
        if (!System.IO.Directory.Exists("NewImg"))
        {
            System.IO.Directory.CreateDirectory("NewImg");
            Console.WriteLine("已创建NewImg目录，请把需要处理的图片放到该目录下");
            Console.ReadKey(true);
            return;
        }
        if (!System.IO.Directory.Exists("CompressedImg")){
            System.IO.Directory.CreateDirectory("CompressedImg");
        }
        string url = "https://api.tinify.com/shrink";
        string[] fileStrs = System.IO.Directory.GetFiles("NewImg");
        Console.WriteLine("共" + fileStrs.Length + "个文件,请等待下载完成...");
        int num = 0;
        foreach (string s in fileStrs)
        {
            System.IO.FileInfo info = new System.IO.FileInfo(s);
            if (info.Extension == ".png" || info.Extension == ".jpg")
            {
                string input = @"NewImg/" + info.Name;
                string output = @"CompressedImg/" + info.Name;
                GetCompressImg(url, key, input, output);
                num++;
            }
        }
        Console.WriteLine("文件已下载到CompressedImg文件夹下，共" + num + "个文件");
        Console.ReadKey(true);
    }
    static public void GetCompressImg(string url,string key,string input,string output){
        WebClient client = new WebClient();
        string auth = Convert.ToBase64String(Encoding.UTF8.GetBytes("api:" + key));
        client.Headers.Add(HttpRequestHeader.Authorization, "Basic " + auth);
        try
        {
            client.UploadData(url, File.ReadAllBytes(input));
            client.DownloadFile(client.ResponseHeaders["Location"], output);
        }
        catch (WebException)
        {
            Console.WriteLine("网络请求失败:" + input);
        }
    }
}