我需要从单个文件夹中的许多文件中提取第20到30个字母，然后将结果打印到文本文件中。
我知道我需要使用using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace practise_Delegates_MenuDriven
{
class Program
{
delegate int Converter(int value);
static int ToCel(int fah)
{
return fah;
}
static int ToFah(int celsius)
{
return celsius;
}
static int ToKel(int celsius2)
{
return celsius2;
}
static int ToRank(int celsius3)
{
return celsius3;
}
static void DisplayMenu()
{
Console.WriteLine("Celsius Converter");
Console.WriteLine("=================");
Console.WriteLine("C - Celsius to Fahrenheit");
Console.WriteLine("F - Fahrenheit to Celsius");
Console.WriteLine("K - Celsius to Kelvin");
Console.WriteLine("R - Celsius to Rankine");
Console.WriteLine("X - Exit");
}
static char GetMenuOption(char letter)
{
Console.WriteLine("Please enter C, F, K, R, X: ");
letter = Convert.ToChar(Console.ReadLine());
return letter;
}
static int GetValue(int value)
{
Console.WriteLine("Please enter the value to convert: ");
value = Convert.ToInt32(Console.ReadLine());
return value;
}
static void PrintResult(int fromValue,int result,string fromstring,string toString)
{
Console.WriteLine(fromValue + " " + fromstring + " is " + result + " " + toString);
}
static void Main(string[] args)
{
Converter process = ToCel;
Converter process1 = ToCel;
Converter process2 = ToKel;
Converter process3 = ToKel;
***switch statement? while loop?***
}
}
但是无法管理多个文件。
我为单个文件使用创建了一个工作脚本：
substring(20,10)但现在我需要处理多个文件。 有什么帮助吗？
答案 0 :(得分：0)
这可能有效
#Path to directory
$DirPath = "C:\Files"
#get all text files from above path
$Files = Get-ChildItem -Path $DirPath -Filter "*.txt"
#path to text file where strings are stored
$DesFile = "C:\String.txt"
#loop through all files and save to desfile
foreach ($txt in $Files)
{
$var = Get-Content -Path $txt.FullName
$var.Substring(20,10) | Add-Content -Path $DesFile
}