是否有用于水平字符串连接的内置函数

本文关键字：内置 函数 连接 字符串 用于 水平 是否 | 更新日期: 2023-09-27 18:08:52

给定两个文件:

File1

a a a
B B B
C C C

File2

d d
e e

Bash有一个命令可以水平连接这些文件:

paste File1 File2

a a a d d
B B B e e
C C C

c#有这样的内置函数吗?

是否有用于水平字符串连接的内置函数

public void ConcatStreams(TextReader left, TextReader right, TextWriter output, string separator = " ")
{
    while (true)
    {
        string leftLine = left.ReadLine();
        string rightLine = right.ReadLine();
        if (leftLine == null && rightLine == null)
            return;
        output.Write((leftLine ?? ""));
        output.Write(separator);
        output.WriteLine((rightLine ?? ""));
    }
}

使用例子:

StringReader a = new StringReader(@"a a a
b b b
c c c";
StringReader b = new StringReader(@"d d
e e";
StringWriter c = new StringWriter();
ConcatStreams(a, b, c);
Console.WriteLine(c.ToString());
// a a a d d
// b b b e e
// c c c

不幸的是，Zip()需要等于长度的文件，所以在Linq的情况下，你必须实现这样的东西:

public static EnumerableExtensions {
  public static IEnumerable<TResult> Merge<TFirst, TSecond, TResult>(
    this IEnumerable<TFirst> first,
    IEnumerable<TSecond> second,
    Func<TFirst, TSecond, TResult> map) {
      if (null == first)
        throw new ArgumentNullException("first");
      else if (null == second)
        throw new ArgumentNullException("second");
      else if (null == map)
        throw new ArgumentNullException("map");
      using (var enFirst = first.GetEnumerator()) {
        using (var enSecond = second.GetEnumerator()) {
          while (enFirst.MoveNext())
            if (enSecond.MoveNext())
              yield return map(enFirst.Current, enSecond.Current);
            else
              yield return map(enFirst.Current, default(TSecond));
          while (enSecond.MoveNext())
            yield return map(default(TFirst), enSecond.Current);
        }
      }
    }
  }
}

使用Merge扩展方法，可以将

var result = File
  .ReadLines(@"C:'First.txt")
  .Merge(File.ReadLines(@"C:'Second.txt"), 
         (line1, line2) => line1 + " " + line2);
File.WriteAllLines(@"C:'CombinedFile.txt", result);
// To test 
Console.Write(String.Join(Environment.NewLine, result));
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