搜索字符串数组是否包含数组if char'；s

目前我正在处理一个小项目，这是一个倒计时类型的游戏（电视节目）。目前，该程序允许用户选择一个元音或辅音，最多只能选择9个字母，然后要求用户输入他们能想到的使用这9个字母的最长单词。

我有一个充当词典的大文本文件，我使用用户输入的字符串进行搜索，试图匹配结果，以检查他们输入的单词是否是有效的单词。我的问题是，我想在字典里搜索由九个字母组成的最长单词，但我似乎找不到实现它的方法

到目前为止，我已经尝试将每个单词放入一个数组中，并在每个元素中搜索，以检查它是否包含字母，但如果9个字母中最长的单词是8个字母的单词，我就无法理解了。有什么想法吗？目前我有这个（这是在表单上的提交按钮下，很抱歉没有提供代码或提到这是一个windows表单应用程序）：

StreamReader textFile = new StreamReader("C:/Eclipse/Personal Projects/Local_Projects/Projects/CountDown/WindowsFormsApplication1/wordlist.txt");
int counter1 = 0;
String letterlist = (txtLetter1.Text + txtLetter2.Text + txtLetter3.Text + txtLetter4.Text + txtLetter5.Text + txtLetter6.Text + txtLetter7.Text + txtLetter8.Text + txtLetter9.Text); // stores the letters into a string
char[] letters = letterlist.ToCharArray(); // reads the letters into a char array
string[] line = File.ReadAllLines("C:/Eclipse/Personal Projects/Local_Projects/Projects/CountDown/WindowsFormsApplication1/wordlist.txt"); // reads every line in the word file into a string array (there is a new word on everyline, and theres 144k words, i assume this will be a big performance hit but i've never done anything like this before so im not sure ?)
line.Any(x => line.Contains(x)); // just playing with linq, i've no idea what im doing though as i've never used before
for (int i = 0; i < line.Length; i++)// a loop that loops for every word in the  string array
//  if (line.Contains(letters)) //checks if a word contains the letters in the char array(this is where it gets hazy if i went this way, i'd planned on only using words witha  letter length > 4, adding any words found to another text file and either finding the longest word then in this text file or keeping a running longest word i.e.  while looping i find a word with 7 letters, this is now the longest word, i then go to the next word and it has 8 of our letters, i now set the longest word to this)
counter1++;
if (counter1 > 4)

txtLongest.Text+=line+Environment.NewLine；

Mike的代码：

using System;

使用System.Collections.Generic；使用System.Linq；

类程序

static void Main(string[] args) {
    var letters = args[0];
    var wordList = new List<string> { "abcbca", "bca", "def" }; // dictionary
    var results = from string word in wordList // makes every word in dictionary into a seperate string
                  where IsValidAnswer(word, letters) // calls isvalid method
                  orderby word.Length descending // sorts the word with most letters to top
                  select word; // selects that word
    foreach (var result in results) {
        Console.WriteLine(result);    //  outputs the word
    }
}
private static bool IsValidAnswer(string word, string letters) {
    foreach (var letter in word) {
        if (letters.IndexOf(letter) == -1) { // checks if theres letters in the word
            return false;
        }
        letters = letters.Remove(letters.IndexOf(letter), 1);
    }
    return true;
}

}

using System;
using System.Collections.Generic;
using System.Linq;
class Program
{
    static void Main(string[] args) {
        var letters = args[0];
        var wordList = new List<string> { "abcbca", "bca", "def" };
        var results = from string word in wordList
                      where IsValidAnswer(word, letters)
                      orderby word.Length descending
                      select word;
        foreach (var result in results) {
            Console.WriteLine(result);    
        }
    }
    private static bool IsValidAnswer(string word, string letters) {
        foreach (var letter in word) {
            if (letters.IndexOf(letter) == -1) {
                return false;
            }
            letters = letters.Remove(letters.IndexOf(letter), 1);
        }
        return true;
    }
}

string[] strArray = {"ABCDEFG", "HIJKLMNOP"};
string findThisString = "JKL";
int strNumber;
int strIndex = 0;
for (strNumber = 0; strNumber < strArray.Length; strNumber++)
{
    strIndex = strArray[strNumber].IndexOf(findThisString);
    if (strIndex >= 0)
        break;
}
System.Console.WriteLine("String number: {0}'nString index: {1}",
    strNumber, strIndex);

private static void Main()
{
    char[] picked_char = {'r', 'a', 'j'};
    string[] dictionary = new[] {"rajan", "rajm", "rajnujaman", "rahim", "ranjan"};
    var words = dictionary.Where(word => picked_char.All(word.Contains)).OrderByDescending(word => word.Length);

    foreach (string needed_words in words)
    {
        Console.WriteLine(needed_words);
    }
}