我已经设法写出了一个递归函数的代码，它返回一个组合的所有序列，没有重复，也有重复。但是，我想知道是否有人可以帮助我将那些结果写入一个文件（。txt，。doc，。csv，。xls等。。）在C#中使用控制台应用程序或windows窗体应用程序。下面是我的代码:
using System;
using System.IO;
namespace Combinations
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Welcome to Combinations Program");
Console.WriteLine("-------------------------------");
Console.Write("Start= ");
int start = int.Parse(Console.ReadLine());
Console.Write("End= ");
int end = int.Parse(Console.ReadLine());
Console.Write("Places= ");
int places = int.Parse(Console.ReadLine());
int[] arr = new int[places];
Console.WriteLine("Combinations without repetition");
CalcCombinationsWithoutRep(start, end, 0, arr);
}
static void CalcCombinationsWithoutRep(int start, int end, int index, int[] arr)
{
if (index == arr.Length)
{
Console.WriteLine(string.Join("-", arr));
return;
//string.Join("-", arr);
}
for (int i = start; i <= end; i++)
{
arr[index] = i;
//Combinations without repetition
CalcCombinationsWithoutRep(i + 1, end, index + 1, arr);
}
}
}
}
下面是一个具有临时文件位置的解决方案
static void Main(string[] args)
{
Console.WriteLine("Welcome to Combinations Program");
Console.WriteLine("-------------------------------");
Console.Write("Start= ");
int start = int.Parse(Console.ReadLine());
Console.Write("End= ");
int end = int.Parse(Console.ReadLine());
Console.Write("Places= ");
int places = int.Parse(Console.ReadLine());
int[] arr = new int[places];
using (StreamWriter streamWriter = new StreamWriter(@"C:\Temp\result.txt"))
{
Console.WriteLine("Combinations without repetition");
streamWriter.WriteLine("Combinations without repetition");
CalcCombinationsWithoutRep(start, end, 0, arr, streamWriter);
}
}
static void CalcCombinationsWithoutRep(int start, int end, int index, int[] arr, StreamWriter streamWriter)
{
if (index == arr.Length)
{
Console.WriteLine(string.Join("-", arr));
streamWriter.WriteLine(string.Join("-", arr));
return;
//string.Join("-", arr);
}
for (int i = start; i <= end; i++)
{
arr[index] = i;
//Combinations without repetition
CalcCombinationsWithoutRep(i + 1, end, index + 1, arr, streamWriter);
}
}
接下来你可以做的是为你的命令行定义参数。对此有用的项目是commandlinehttps://github.com/commandlineParser/commandline
