Question

我正在寻找一种方法用00000覆盖.dat文件中的某些部分。为此我有一个StringBuilder，内容如下：

"00000000            0000000000000000          "

现在我正在寻找一种方法，用零覆盖文件中的部分，而justs用空格保留部分的内容。

所以，如果我有

"AUEUIGHEVjerhvgm,eiouhegfwoedjkjjjjjjjjjjjjjjje"

我希望它变成

"00000000Vjerhvgm,eio0000000000000000jjjjjjjjjje"

这种方法存在吗？或者我应该以另一种方式完成这项任务？

Answer 1

我认为你的规范有点错误，但似乎你想要这样的东西：

var pattern   = new StringBuilder("         00000000            0000000000000000 ");
var target    = "AUEUIGHEVjerhvgm,eiouhegfwoedjkjjjjjjjjjjjjjjje";
var workspace = new StringBuilder(target);

for (int i = 0, n = Math.Min(pattern.Length, target.Length); i < n; ++i)
    if (pattern[i] != '0')
        workspace[i] = '0';

string result = workspace.ToString();

在这个例子中，结果将是000000000jerhvgm,000000000000jkjjjjjjjjjjjjjj0e，这不是你的例子所说的 - 但我认为你的例子有点错误......

Answer 2

var byteCharZero = Convert.ToByte('0');
var stringBuilder = new StringBuilder("         00000000            0000000000000000 ");
using (var fileStream = File.Open("D:\\file.dat", FileMode.OpenOrCreate, FileAccess.Write))
{
  var length = Math.Min(stringBuilder.Length, fileStream.Length);
  for (var i = 0; i < length; i++)
  {
    if (stringBuilder[i] == '0')
    {
      fileStream.Position = i;
      fileStream.WriteByte(byteCharZero);
    }
  }
}

覆盖文件，但只覆盖非空格的部分

2 个答案: