Question

这是我的代码，首先我要跳过前4个字母并拆分其余部分并阅读它以根据txt文件更新我的数据库。

StreamReader sr = null;
try
{
    FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read);
    sr = new StreamReader(fs);
    string lines = sr.ReadLine();

    while (!sr.EndOfStream)
    {
        string[] words = lines.Split(' ');
        string ReservationNumber = words[0];
        double deposit = Convert.ToDouble((words[1]));

        if (GetCustomer(ReservationNumber).Customer_Res_Number == ReservationNumber)
        {
            UpdateDeposit(ReservationNumber, deposit);
        }
        lines = sr.ReadLine();
    }
}

Answer 1

为什么不使用File类和 Linq 而不是Stream和Reader？如果是Linq，可以轻松跳过4热门文件的行 - Skip(4)：

跳过4顶部行（文件的标题？）：

// Data (lines) to process
var lines = File
  .ReadLines(filename)
  .Skip(4)                            // <- Skip first 4 lines (file's caption?)
  .Select(line => line.Split(' '))
  .Select(words => new {
     ReservationNumber = words[0],
     deposit = Convert.ToDouble(words[1]), 
    })
  .Where(rec => GetCustomer(rec.ReservationNumber).Customer_Res_Number ==
                rec.ReservationNumber);  

// Data Processing
foreach (var item in lines)
  UpdateDeposit(item.ReservationNumber, item.deposit);

如果你想从第1行（校验和或类似的？）中跳过第1个4 个字符：

var lines = File
  .ReadLines(filename)
  .Select((line, index) => index == 0 
     ? line.Substring(4) // <- Skip 4 first characters from the 1st line
     : line) 
  .Select(line => line.Split(' '))
...

最后，如果您想从每个行跳过4 个字符：

var lines = File
  .ReadLines(filename)
  .Select(line => line.Substring(4)) // <- Skip 4 fisrt characters from each line
  .Select(line => line.Split(' '))
...

Answer 2

也许......？

while (!sr.EndOfStream)
{
    string line = sr.ReadLine();
    string newline = line.Substring(3);
    ...
}

在txt文件中跳过前4行然后拆分其余部分并读取它

2 个答案: