本文主要向大家介绍了C#编程之使用TinyPNG提供的API，对图片进行压缩，通过具体的内容向大家展示，希望对大家学习C#编程有所帮助。

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);

}

}

}

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