如何在逐字节读取 CSV 文件时检测字节是否为换行符 - C#

Question

我需要逐字节读取 CSV 文件（注意：我不想逐行读取）。如何检测读取的字节是否为换行符？如何知道已到达行尾？

int count = 0;
byte[] buffer = new byte[MAX_BUFFER];

using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read))
{              
    // Read bytes form file until the next line break -or- eof 
    // so we don't break a csv row in the middle

    // What should be instead of the 'xxx' ?

    while (((readByte = fs.ReadByte()) != 'xxx') && (readByte != -1))
    {
        buffer[count] = Convert.ToByte(readByte);
        count++;
    }
} 

Answer 1

换行符有十进制值10或十六进制值0xA。为了检查换行符，将结果与0xA

int count = 0;
byte[] buffer = new byte[MAX_BUFFER];

using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read))
{              
    // Read bytes form file until the next line break -or- eof 
    // so we don't break a csv row in the middle

    // What should be instead of the 'xxx' ?

    while (((readByte = fs.ReadByte()) != 0xA) && (readByte != -1))
    {
        buffer[count] = Convert.ToByte(readByte);
        count++;
    }
} 

当readByte等于10或0xA以十六进制表示时，条件为假。查看ASCII 表以获取更多信息。

更新

您可能还想定义一个常量 likeconst int NEW_LINE = 0xA并使用它，而不仅仅是0xA在 while 语句中。这只是为了帮助您稍后弄清楚这0xA实际上意味着什么。