处理文本

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp3
{
class Program
{
static void Main(string[] args)
{

string path = @"C:Usersalan.wangDesktop1.txt";// 文件路径
string pathWrite = @"C:Usersalan.wangDesktop4.txt";// 文件路径
FileStream filestream = new FileStream(path, FileMode.Open);

byte[] bt = new byte[filestream.Length];

//调用read读取方法
filestream.Read(bt, 0, bt.Length);
string str = System.Text.Encoding.Default.GetString(bt);

System.Text.RegularExpressions.Regex reg;
string regexCode = @"MultiLanguage.GetRes(.*?)";
reg = new System.Text.RegularExpressions.Regex(regexCode);
System.Text.RegularExpressions.MatchCollection mc = reg.Matches(str);
List<string> list = new List<string>();
string liststr = "";
for (int i = 0; i < mc.Count; i++)
{
if (i == 0)
{
liststr = mc[i].Value + " ";
}
else
{
liststr = liststr + mc[i].Value + " ";
}

}
using (FileStream fileStream = File.Create(pathWrite))
{
byte[] bytes = new UTF8Encoding(true).GetBytes(liststr);
fileStream.Write(bytes, 0, bytes.Length);
fileStream.Close();
}

}

}
}

图片前端传给后台Base64 转二进制    Byte[] fileContent = Convert.FromBase64String(base64Content);