摘要：
项目需要，经常需要手动压缩图片，流程太过麻烦，效率低下。System.IO.Directory.Exists){System.IO.Directory.CreateDirectory;}stringurl="https://api.tinify.com/shrink";string[]fileStrs=System.IO.Directory.GetFiles;Console.WriteLine;intnum=0;foreach{System.IO.FileInfoinfo=newSystem.IO.FileInfo;if{stringinput=@"NewImg/"+info.Name;stringoutput=@"CompressedImg/"+info.Name;GetCompressImg;num++;}}Console.WriteLine;Console.ReadKey;}staticpublicvoidGetCompressImg{WebClientclient=newWebClient();stringauth=Convert.ToBase64String;client.Headers.Add;try{client.UploadData;client.DownloadFile;}catch{Console.WriteLine;}}}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。
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;classProgram{staticvoidMain(){Console.WriteLine("请输入TinyPng.com的API KEY,获取地址:https://tinypng.com/developers");stringkey =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");}stringurl ="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...");intnum =0;foreach(strings infileStrs){System.IO.FileInfoinfo =newSystem.IO.FileInfo(s);if(info.Extension==".png"||info.Extension==".jpg"){stringinput =@"NewImg/"+info.Name;stringoutput =@"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);}staticpublicvoidGetCompressImg(stringurl,stringkey,stringinput,stringoutput){WebClientclient =newWebClient();stringauth =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;classProgram{staticpublicintfileNums =0;staticpublicintstatus =0;staticvoidMain(){Console.WriteLine("请输入TinyPng.com的API KEY,获取地址:https://tinypng.com/developers");stringkey =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");}stringurl ="https://api.tinify.com/shrink";string[]fileStrs =System.IO.Directory.GetFiles("NewImg");fileNums =fileStrs.Length;foreach(strings infileStrs){System.IO.FileInfoinfo =newSystem.IO.FileInfo(s);if(info.Extension==".png"||info.Extension==".jpg"){stringinput =@"NewImg/"+info.Name;stringoutput =@"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);}staticpublicasync voidSendReq(stringurl,stringkey,stringinput,stringoutput){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");}}staticpublicasync TaskGetCompressImg(stringurl,stringkey,stringinput,stringoutput){WebClientclient =newWebClient();stringauth =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);}}}