生成所有可能的组合

using System;using System.Text;public static string[] GenerateCombinations(string[] Array1, int[] Array2){    if(Array1 == null) throw new ArgumentNullException("Array1");    if(Array2 == null) throw new ArgumentNullException("Array2");    if(Array1.Length != Array2.Length)        throw new ArgumentException("Must be the same size as Array1.", "Array2");    if(Array1.Length == 0)        return new string[0];    int outputSize = 1;    var current = new int[Array1.Length];    for(int i = 0; i < current.Length; ++i)    {        if(Array2[i] < 1) throw new ArgumentException("Contains invalid values.", "Array2");        if(Array1[i] == null) throw new ArgumentException("Contains null values.", "Array1");        outputSize *= Array2[i];        current[i] = 1;    }    var result = new string[outputSize];    for(int i = 0; i < outputSize; ++i)    {        var sb = new StringBuilder();        for(int j = 0; j < current.Length; ++j)        { sb.Append(Array1[j]); sb.Append(current[j].ToString()); if(j != current.Length - 1)     sb.Append(' ');        }        result[i] = sb.ToString();        int incrementIndex = current.Length - 1;        while(incrementIndex >= 0 && current[incrementIndex] == Array2[incrementIndex])        {     current[incrementIndex] = 1;     --incrementIndex;        }        if(incrementIndex >= 0) ++current[incrementIndex];    }    return result;}