c#读取文件中汉字的问题

Question

   using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;namespace ReadFile
{
    class Program
    {
        static void Main(string[] args)
        {
            int i = 1, m;                                                                //变量声明
            byte[] array = new byte[2];
            byte[] byData = new byte[1];
            char[] charData = new char[100];
            string Filename,ss;                                                          //输入文件名
            Console.WriteLine("请输入文件名，按回车输入完毕");
            Filename=Console.ReadLine();
           
            Encoding gb = Encoding.GetEncoding("gb2312");
           
            try
            {
                FileStream aFile = new FileStream(Filename, FileMode.Open);             //打开文件
                
                for (i = 1; aFile.Length!= aFile.Position; i++)                         //循环操作 读取字符 直至文件尾
                {
                    aFile.Read(byData, 0, 1);                                           //读取一个字符 
                    Decoder f = Encoding.UTF8.GetDecoder();
                    f.GetChars(byData, 0, 1, charData, 0);
            
                    if (charData[0] == ':')                                             //找冒号 找到后输出其前面的字符
                    {
                        i = i - 2;                        aFile.Seek(i, SeekOrigin.Begin);         //指针移至冒号前面的字符
                        aFile.Read(byData, 0, 1);                //读取
                        aFile.Seek(i + 2, SeekOrigin.Begin);     //指针复位
                        Decoder e = Encoding.UTF8.GetDecoder();
                        e.GetChars(byData, 0, byData.Length, charData, 0);//将读取的字符 转到字符数组
                        i = i + 2;                                        //i复位
                        Console.WriteLine(charData);                      //输出字符                        if (((charData[0] > 'A') && (charData[0] < 'z')) || (('0' < charData[0]) && (charData[0] < '9')))
                                                 {
                                                     Console.WriteLine(charData);                                                 }
                                                 else
                                                 {
                                                     i = i - 3;
                                                     aFile.Seek(i, SeekOrigin.Begin);
                                                     aFile.Read(byData, 0, 2);
                                                     Decoder d = Encoding.UTF8.GetDecoder();
                                                     d.GetChars(byData, 0, byData.Length, charData, 0);
                                                  
                                                     aFile.Seek(i + 3, SeekOrigin.Begin);                                                   
                                                     Console.WriteLine(charData);
                                                     i = i + 3;
                                                 }
                                         }
                }
               
            }
            catch (IOException e)                                   //异常处理
            {
                Console.WriteLine("An IO exception has been thrown!");
                Console.WriteLine(e.ToString());
                Console.ReadLine();
                return;
            }
            
        
         }
    }
}大体意思是输出文件中冒号前的字符，但是如果是汉字会出错 ，求人解决

Answer 1

搂主读个文件怎么用这么麻烦，且容易出错的方法？
我刚给你写了一个，参考一下：
static void Main(string[] args)
{
    StreamReader reader = new StreamReader(filePath, Encoding.Default);
    string line = string.Empty;
    while ((line = reader.ReadLine()) != null)
    {
        int pos = line.IndexOf(':');
        if (pos >= 0)
        {
            Console.WriteLine(line.Substring(++pos));
        }
    }
    reader.Close();
    reader.Dispose();
    Console.ReadKey();
}

Answer 2

就是啊，好麻烦，C#字符处理函数IndexOf(),IndexOfAny(),LastIndexOf(),LastIndexOfAny()中的任何一个函数都可以实现你的目的啊

Answer 3

楼主以前可能是用c编程，找到冒号之后截取之前的字符，c#中的String类很强大

Answer 4

噢，是前面的呀？那改下：
static void Main(string[] args)
{
    StreamReader reader = new StreamReader(filePath, Encoding.Default);
    string line = string.Empty;
    while ((line = reader.ReadLine()) != null)
    {
        int pos = line.IndexOf(':');
        if (pos > 0)
        {
            Console.WriteLine(line.Substring(0，pos));
        }
    }
    reader.Close();
    reader.Dispose();
    Console.ReadKey();
}如果搂主只是想取出汉字，而不要其他字符的话，还得循环判断下ASCII码