C# 需要括号时不需要和其他错误我似乎无法找到解决方案

Question

我正在制作将从文件中读取 json 数据的类，但由于某些未知原因，我不断收到错误消息。我真的希望这不仅仅是我的愚蠢错误。

我的代码：- 不工作

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Blackjack
{
    class LeaderBoard
    {
        LeaderBoard(string fileName)
        {
            public string filename = fileName;
            if (!File.Exists(fileName))
            {
                File.Create(fileName);
            }
            private string contents = System.IO.File.ReadAllLines(fileName);
        }
    }
}

我的代码 - 工作

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Blackjack
{
    class LeaderBoard
    {
        LeaderBoard(string fileName)
        {
           
            if (!File.Exists(fileName))
            {
                File.Create(fileName);
            }
            
        }
    }
}

输出

Build started...
1>------ Build started: Project: Blackjack, Configuration: Debug Any CPU ------
1>C:\Users\ASUS\RiderProjects\Blackjack\Blackjack\Leaderboard.cs(13,10,13,10): error CS1513: } expected
1>C:\Users\ASUS\RiderProjects\Blackjack\Blackjack\Leaderboard.cs(15,13,15,15): error CS1519: Invalid token 'if' in class, record, struct, or interface member declaration
1>C:\Users\ASUS\RiderProjects\Blackjack\Blackjack\Leaderboard.cs(15,17,15,18): error CS1031: Type expected
1>C:\Users\ASUS\RiderProjects\Blackjack\Blackjack\Leaderboard.cs(15,17,15,18): error CS8124: Tuple must contain at least two elements.
1>C:\Users\ASUS\RiderProjects\Blackjack\Blackjack\Leaderboard.cs(15,17,15,18): error CS1026: ) expected
1>C:\Users\ASUS\RiderProjects\Blackjack\Blackjack\Leaderboard.cs(15,17,15,18): error CS1519: Invalid token '!' in class, record, struct, or interface member declaration
1>C:\Users\ASUS\RiderProjects\Blackjack\Blackjack\Leaderboard.cs(15,29,15,30): error CS1519: Invalid token '(' in class, record, struct, or interface member declaration
1>C:\Users\ASUS\RiderProjects\Blackjack\Blackjack\Leaderboard.cs(15,38,15,39): error CS8124: Tuple must contain at least two elements.
1>C:\Users\ASUS\RiderProjects\Blackjack\Blackjack\Leaderboard.cs(15,39,15,40): error CS1519: Invalid token ')' in class, record, struct, or interface member declaration
1>C:\Users\ASUS\RiderProjects\Blackjack\Blackjack\Leaderboard.cs(17,28,17,29): error CS1519: Invalid token '(' in class, record, struct, or interface member declaration
1>C:\Users\ASUS\RiderProjects\Blackjack\Blackjack\Leaderboard.cs(17,37,17,38): error CS8124: Tuple must contain at least two elements.
1>C:\Users\ASUS\RiderProjects\Blackjack\Blackjack\Leaderboard.cs(17,38,17,39): error CS1519: Invalid token ';' in class, record, struct, or interface member declaration
1>C:\Users\ASUS\RiderProjects\Blackjack\Blackjack\Leaderboard.cs(21,5,21,6): error CS1022: Type or namespace definition, or end-of-file expected
1>C:\Users\ASUS\RiderProjects\Blackjack\Blackjack\Leaderboard.cs(22,1,22,2): error CS1022: Type or namespace definition, or end-of-file expected
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

我真的不知道出了什么问题……那个缺少的分号在哪里？

Answer 1

您不能在类成员中使用访问修饰符，它们只能应用于类成员本身：

class LeaderBoard
{
    public string filename;
    private string[] contents;

    LeaderBoard(string fileName)
    {
        filename = fileName;
        if (!File.Exists(fileName))
        {
            File.Create(fileName);
        }
        contents = System.IO.File.ReadAllLines(fileName);
    }
}

Answer 2

问题是您在类的构造函数中使用了公共和私有。您还应该将内容定义为字符串数组。

namespace Blackjack
{
    class LeaderBoard
    {
        LeaderBoard(string fileName)
        {
            string filename = fileName;
            if (!File.Exists(fileName))
            {
                File.Create(fileName);
            }
            string[] contents = System.IO.File.ReadAllLines(fileName);
        }
    }
}

Answer 3

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Blackjack
{
    class LeaderBoard
    {
        public string LeaderBoard(string fileName)
        {
            string fileContent;
            if (!File.Exists(fileName))
            {
                File.Create(fileName);
            }
            using (var sr = new StreamReader(fileName)) {
                if(sr.ReadToEnd() == null) {
                    return "File is empty";
                }
                fileContent = sr.ReadToEnd();
            }
            return fileContent;
        }
    }
}

已编辑，可能会好一点。

试试这个:)