StreamReader乱码问题

[hongprogrammer]

class Program
{

static void Main(string[] args)
{
StreamReader file = new StreamReader("d:\\a.txt",Encoding.UTF8);

int a = 0;
try
{
a= file.Read();
while (a!=-1)
{
Console.WriteLine(Convert.ToString(a,16));
Console.WriteLine((char)a);
a = file.Read();
}

}
catch (Exception e) { Console.WriteLine(e.Message); }
}
}
这段程序输出为什么是
fffd
?
439
й
fffd
?
我始终不明白其中原理，请高手帮忙解决一下，谢谢

[机器人]

参考下面代码修改：

using System;
using System.IO;

class Test
{

public static void Main()
{
string path = @"c:\temp\MyTest.txt";

try
{
if (File.Exists(path))
{
File.Delete(path);
}

using (StreamWriter sw = new StreamWriter(path))
{
sw.WriteLine("This");
sw.WriteLine("is some text");
sw.WriteLine("to test");
sw.WriteLine("Reading");
}

using (StreamReader sr = new StreamReader(path))
{
while (sr.Peek() >= 0)
{
Console.Write((char)sr.Read());
}
}
}
catch (Exception e)
{
Console.WriteLine("The process failed: {0}", e.ToString());
}
}
}

[机器人]

参考下面代码修改：

using System;
using System.IO;

class Test 
{
    
    public static void Main() 
    {
        string path = @"c:\temp\MyTest.txt";

        try 
        {
            if (File.Exists(path)) 
            {
                File.Delete(path);
            }

            using (StreamWriter sw = new StreamWriter(path)) 
            {
                sw.WriteLine("This");
                sw.WriteLine("is some text");
                sw.WriteLine("to test");
                sw.WriteLine("Reading");
            }

            using (StreamReader sr = new StreamReader(path)) 
            {
                while (sr.Peek() >= 0) 
                {
                    Console.Write((char)sr.Read());
                }
            }
        } 
        catch (Exception e) 
        {
            Console.WriteLine("The process failed: {0}", e.ToString());
        }
    }
}

[易企加_天马行空]

你写入的额时候不适用utf8写的，读的时候用这个读就可能乱码了

[cja03]

"d:\\a.txt",Encoding.UTF8
----------------------------
保存的时候是否用UTF8保存？

[mykelly6]

[Quote=引用 3 楼 tmxk2002 的回复:]
你写入的额时候不适用utf8写的，读的时候用这个读就可能乱码了
[/Quote]
对阿，你不确定写入的encoding的话最好读的时候不要指定

[烈火蜓蜻]

class Program 
    { 

      static void Main(string[] args) 
        { 
            StreamReader file = new StreamReader("d:\\a.txt",Encoding.Default); 

            int a = 0; 
            try 
            { 
              a= file.Read(); 
              while (a!=-1) 
              { 
                  Console.WriteLine(Convert.ToString(a,16)); 
                  Console.WriteLine((char)a); 
                  a = file.Read(); 
              } 
                
            } 
            catch (Exception e) { Console.WriteLine(e.Message); } 
          } 
        } 

文件的编码不是Utf-8，你用我上面写的试试