StreamReader返回另一个字符

我试图用一个StreamReader读取一个文件的内容,它接收一个文件流。文件中有一些空格(char 32),StreamReader将它们读取为0(char 48)。屏幕截图显示了FileStream缓冲区和StreamReader缓冲区。两者的值都是32,但是当我调用Read()时,它返回48。我在这里遗漏了什么吗?顺便说一下,代码是在.NET Compact Framework下运行的。

alt text http://www.freeimagehosting.net/uploads/9f72b61bbe.png

读取数据的代码:

public void Read() {
 using (StreamReader reader = new StreamReader(InputStream, Encoding.UTF8)) {
  foreach (var property in DataObject.EnumerateProperties()) {
   OffsetInfo offset = property.GetTextOffset();
   reader.BaseStream.Position = offset.Start - 1;
   StringBuilder builder = new StringBuilder(offset.Size);
   int count = 0;
   while (reader.Peek() >= 0 && count < offset.Size) {
    char c = (char)reader.Read();
    if ((int)c != 32 && c != '\r' && c != '\n')  {
     builder.Append(c);
     count++;
    } else {
     reader.BaseStream.Position++;
    }
   }
   property.SetValue(DataObject,
    Convert.ChangeType(builder.ToString(), property.PropertyType, CultureInfo.CurrentCulture),
    null
   );
  }
 }
}

更改编码不起作用(Unicode和Default都不起作用)

编辑: 输入如下所示:

000636920000000532000404100100000001041000000001041000000001031000000000000000000000000000000000000000001730173017301730203020302030203021302130213021300027900267841515150000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000280010000000280010000000280010000020
260007464616011007464816011009005321011009005621011010041621011010041821011013574026011013574226011014564729011014564929011018343318021018343618021020035418021020035618021022583818021022584018021005474302031005474502031010311305031010311505031011265308031011265508031011265508031011274108031021524009
0310215242090310060151130310063110130310160022210310160024210310022837280310022839280310                                                                                                                                                                                                                    
                                                                                                                                                                                                                                        00206377740002484841000029844400181529330003034081000000000000000000

问题发生在从第三行开始到第四行的空格上。