使用TinyPNG提供的API，对图片进行压缩（C#）

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项目需要，经常需要手动压缩图片，流程太过麻烦，效率低下。所以写了一个小程序，以提高工作效率


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);
        }
    }
}

上面的程序在下载期间会阻塞主线程，效率不够高。

使用await/async改写成异步模式。


using System;
using System.Net;
using System.Text;
using System.IO;
using System.Threading.Tasks;

class Program
{

	static public int fileNums = 0;
	static public int status = 0;

	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");
		fileNums = fileStrs.Length;

		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;
				SendReq(url, key, input, output);
			}
		}

		Console.WriteLine("共" + fileNums + "个文件,请等待下载完成...");
		Console.ReadKey(true);
    }

	static public async void SendReq(string url, string key, string input, string output) {
		await GetCompressImg(url, key, input, output);		
		Console.WriteLine("已完成:" + input);
		status++;
		if (status == fileNums) {
			Console.WriteLine("下载已全部完成，共" + status + "个文件");
		}
	}

	static public async Task 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 {
			await client.UploadDataTaskAsync(url, File.ReadAllBytes(input));
			await client.DownloadFileTaskAsync(client.ResponseHeaders["Location"], output);
		} catch (WebException) {
			Console.WriteLine("网络请求失败:" + input);
		}

	}
}