代码之家 › 专栏 › 技术社区 › thehelaeper67

如何在运行时将用户输入保存到数组中?

console-application c#

thehelaeper67 · 技术社区 · 2 年前

我一直在处理列表,所以我完成了这项工作,但我正在尝试使用另一种数据结构,例如大堆 .

我下面的代码运行良好,当我输入全名+电话号码时,它会按原样打印出来。但由于我使用的是switch case,如果我转到另一个case,之前输入的值(全名+电话号码)都不见了。

case 2:
    Console.WriteLine("Enter first name:");
    string firstName = Console.ReadLine();

    Console.WriteLine("Enter last name:");
    string lastName = Console.ReadLine();

    Console.WriteLine("Enter your phone number:");
    int mobileNo = Convert.ToInt32(Console.ReadLine());

    Console.WriteLine(firstName + ", " + lastName + ", " + mobileNo);
    break;

我使用的是控制台应用程序,在关闭程序之前,我不需要将值保存到文本文件中,只需在屏幕上即可。我已经能够用现有的数组值来做这件事,只是不能用用户输入的值,所以这就是我最终得到的结果。

1 回复 | 直到 2 年前

MrAlbino 2 年前

您可以尝试将变量声明从循环中移除。因此,当面临不同的情况时,它们仍然可用。

//declarations out of your loop.
string firstName ="";
string lastName = "";
int mobileNo=0;
List<string> lines=new List<string>();  
//end of declarations.

//your loop or whatever you have here.
switch()
// your cases.
case 2:
    Console.WriteLine("Enter first name:");
    firstName = Console.ReadLine();

    Console.WriteLine("Enter last name:");
    lastName = Console.ReadLine();

    Console.WriteLine("Enter your phone number:");
    mobileNo = Convert.ToInt32(Console.ReadLine());

    lines.Add(firstName + ", " + lastName + ", " + mobileNo);
    break;

//end of switch statement iterate over lines list to print all lines.
foreach(var line in lines){
    Console.WriteLine(line);
}

b1tByte 2 年前

在C#中,如果您不知道集合中有多少项,最好使用List。

我会这样解决你的任务:

声明一个描述对象的类。(在您的情况下,它是User)

internal class User
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int PhoneNumber { get; set; }

    public override string ToString()
    {
        return $"Full name: {FirstName} {LastName}, Phone Number: {PhoneNumber};";
    }
 }

用户声明列表:
```
var usersList = new List<User>();
```

输入数据:

Console.WriteLine("Enter first name:");
string firstName = Console.ReadLine();

Console.WriteLine("Enter last name:");
string lastName = Console.ReadLine();

Console.WriteLine("Enter your phone number:");
int mobileNo = Convert.ToInt32(Console.ReadLine());

在迭代结束时:

usersList.Add(new User
{
    FirstName = firstName,
    LastName = lastName,
    PhoneNumber = mobileNo
});

如果您想记录您的列表:

foreach (var user in usersList)
{
    Console.WriteLine(user);
}

完整代码:

internal class User
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int PhoneNumber { get; set; }

    public override string ToString()
    {
        return $"Full name: {FirstName} {LastName}, Phone Number: {PhoneNumber};";
    }
}

internal class Program
{
    static void Main(string[] args)
    {
        var usersList = new List<User>();

        switch() // your switch
        {
            case 2:
            {
                Console.WriteLine("Enter first name:");
                string firstName = Console.ReadLine();

                Console.WriteLine("Enter last name:");
                string lastName = Console.ReadLine();

                Console.WriteLine("Enter your phone number:");
                int mobileNo = Convert.ToInt32(Console.ReadLine());

                userList.Add(new User
                {
                    FirstName = firstName,
                    LastName = lastName,
                    PhoneNumber = mobileNo
                });
                break;
            }
        }
        
        foreach (var user in users)
        {
            Console.WriteLine(user);
        }
    }
}