如何在逐字节读取 CSV 文件时检测字节是否为换行符 - C#

How to detect if a byte is a line break when reading from a CSV file byte by byte - C#

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++;
    }
} 

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

进行比较
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++;
    }
} 

readByte 等于 100xA(十六进制)时,条件将为假。 查看 ASCII Table 了解更多信息。

更新

您可能还想定义一个像 const int NEW_LINE = 0xA 这样的常量,并在 while 语句中使用它而不是 0xA。这只是为了帮助您稍后弄清楚 0xA 的实际含义。