将 TryParse 与 double 结合使用会显示过载错误？

Question

我正在编写一个程序并使用 double.Try Parse 来检查字符串是否是数字。

class Game{ // declares the class
    private static string[,] board = new string[3, 3]{
                                          {" ", " ", " "}, // top row
                                          {" ", " ", " "}, // middle row
                                          {" ", " ", " "}  // bottom row
                                      };


private static void print(){
    System.Console.WriteLine("\n {0} | {1} | {2} ", board[2, 0], board[2, 1], board[2, 2]);
    System.Console.WriteLine("------------");
    System.Console.WriteLine(" {0} | {1} | {2} ", board[1, 0], board[1, 1], board[1, 2]);
    System.Console.WriteLine("------------");
    System.Console.WriteLine(" {0} | {1} | {2} \n", board[0, 0], board[0, 1], board[0, 2]);
}

private static void calculateMoves(){
    System.Console.Write("The possible moves are: ");
    int n = 1; // this is used to list all possible moves.
    for (int i = 0; i < 3; i++){
        for (int j = 0; j < 3; j++){
            if (board[i, j] == " "){
                System.Console.Write("{0} ", n);
            }
            n++;
        }
    } // end print possible moves.
    System.Console.WriteLine(); // go to next line
}

public static bool isNumeric(string s){ // this functions checks if the input string is numeric.
    double Result;
    return double.TryParse(s, out Result);
}        

static void Main(){ 
// the main function, the program starts from (this is a method declartion)
    System.Console.WriteLine("\nWelcome to theelitenoob's simple tic tac toe game!");
    System.Console.WriteLine("Written in C#, released under the GPL.");
    System.Console.WriteLine("The board is 3 by 3, Type a number to place a move there.");
    System.Console.WriteLine("So 1 is bottom left and 9 is top right, like a standard keypad.\n");
    int winner = 0; // there is no winner yet.
    // write players piece
    System.Console.WriteLine("You are x");
    // create the board
    int move; // move number
    string input; // the string from which move number is got from
    while(winner == 0){
        print();
        calculateMoves();
        System.Console.Write("Please type in a move number: ");
        input = System.Console.ReadLine();
        if(!isNumeric(input)){ // check if input is *not* numeric
            // if it isn't, print message and ask for input again.
            System.Console.WriteLine("Thats not a valid move, Try again!");
            continue;
        }
        move = System.Convert.ToInt32(input);
        /**/
        if (move == 1 && board[0, 0] == " ")board[0, 0] = "x";
        if (move == 2 && board[0, 1] == " ")board[0, 1] = "x";
        if (move == 3 && board[0, 2] == " ")board[0, 2] = "x";
        if (move == 4 && board[1, 0] == " ")board[1, 0] = "x";
        if (move == 5 && board[1, 1] == " ")board[1, 1] = "x";
        if (move == 6 && board[1, 2] == " ")board[1, 2] = "x";
        if (move == 7 && board[2, 0] == " ")board[2, 0] = "x";
        if (move == 8 && board[2, 1] == " ")board[2, 1] = "x";
        if (move == 9 && board[2, 2] == " ")board[2, 2] = "x";
    } // end while loop
}

}

然而。它向我显示一个错误：每当我尝试编译时，我都浏览了所有 msdn 并搜索了 google，但不知道如何修复。

这是我得到的错误：

tictactoe.cs(33,23): error CS1501: No overload for method 'TryParse' takes '2' arguments

有谁知道为什么会发生这种情况以及如何解决它？

Answer 1

Double.TryParse 方法 有两个重载：

• TryParse(String, NumberStyles, IFormatProvider,双精度）

• TryParse(String,双精度）

前者从 .NET 1.1 开始就存在，而后者是在 .NET 2.0 中引入的。

---

Mono 附带两个编译器：

• mcs -- 旨在实现不带泛型的最新 .NET 版本 (<.NET 2.0)

• gmcs -- 旨在实现带泛型的最新 .NET 版本 (>= .NET 2.0)

因此 mcs 不知道新的重载。它相当过时，而且没有积极维护。

使用 gmcs 获取最新的 C# 和 .NET 版本。

Answer 2

看起来你必须用大写 D 来表示 Double.TryParse。