Question

我无法弄清楚如何在循环中读取用户输入（使用Console.ReadLine）。我正在尝试创建一个注释，让我可以存储用户输入的内容，如果他输入退出则会退出。

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

namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {

            Note myNote = new Note();
            Note otherNote = new Note();
            myNote.addText("Hi there");
            Console.WriteLine(myNote.display());
            otherNote.addText(Console.ReadLine());
            Console.WriteLine(otherNote.display());
            if (otherNote = "exit")
            {

            }

        }
    }


}


    class Note
{
    private string text = "";
    private DateTime timeStamp = DateTime.Now;
    private DateTime modifiedStamp = DateTime.Now;
    int maxLength = 10;


    public void addText(string sometext)
    {
        if (text.Length + sometext.Length < maxLength)
        {
            text += sometext;
            modifiedStamp = DateTime.Now;
        }

    }

    public string display()
    {
        return "Created: " + timeStamp.ToString() + "\n" +
            "Modified: " + modifiedStamp.ToString() + "\n" +
            "Content: " + text;
    }
}

Answer 1

您需要注释列表才能添加任意数量的注释。此外，您需要首先保存ReadLine输入检查用户是否真的要求退出，否则继续添加备注。

var myNotes = new List<Note>();
var firstNote = new Note();
firstNote.addText("Hi there");

Note note;
while (true)
{
    var input = Console.ReadLine();
    if (input.Equals("exit", StringComparison.OrdinalIgnoreCase))
    {
        break;
    }
    note = new Note();
    note.addText(input);
    myNotes.Add(note);
}

Answer 2

一般格式是使用类似这样的东西（带有中断条件的while循环）：

// put code above while loop that only needs to be executed once
while (true) {        
    // get the user input for every iteration, allowing to exit at will
    String line = Console.ReadLine();
    if (line.Equals("exit")) {
        // exit the method.
        return; // use "break" if you just want to exit the loop
    }
    // this is what will happen in the loop body since we didn't exit
    // put whatever note stuff you want to execute again and again in here
}

根据您对音符实例的确切要求，您将要编辑此循环体内的内容。但通常情况下，您会反复提示用户输入，直到满足某些条件，然后您就会退出循环。您可以决定条件（例如＆＃34;输入10个音符＆＃34 ;;＆＃34;输入退出＆＃34;等等）

Answer 3

Per @ n0rd的评论，这里是一个怎么做... while循环可以工作：

string input;
var myNotes = new List<Note>();
do{
    input = Console.ReadLine();
    if (!input.Equals("exit", StringComparison.OrdinalIgnoreCase)){
        var note = new Note();
        note.addText(input);
        myNotes.Add(note);
    }
} while (!input.Equals("exit", StringComparison.OrdinalIgnoreCase));

Answer 4

这样做的一种方法是：

List<string> simpleList = new List<string> { "Alpha", "Bravo", "Charlie", "Delta", "Echo" }; //Dummy data source
        Console.WriteLine("Enter a call sign to find in the list. Press X to exit: "); //Prompt

        string callSign;
        string exitKey = "x";

        while ((callSign = Console.ReadLine()) != exitKey.ToLower()) { //This is where the "Magic" happens
            if (simpleList.Contains(callSign)) {
                Console.WriteLine($"\"{callSign}\" exists in our simple list");//Output should the list contain our entry
                Console.WriteLine(""); //Not really relevant, just needed to added spacing between input and output
            }
            else {
                Console.WriteLine($"\"{callSign}\" does not exist in our simple list"); //Output should the list not contain our entry
            }
            Console.WriteLine("");
            Console.WriteLine("Enter a call sign to find in the list. Press X to exit: ");//Prompt
        }

该行：

while ((callSign = Console.ReadLine()) != exitKey.ToLower()) {
      ...

是循环发生的地方。如果条目不等于exitKey，则重复这些步骤。

Answer 5

要循环Console.ReadLine（），您可以使用此

    `List<string> al = new List<string>(); //list to store string values
    while(true)
    {
        string f = Console.ReadLine();
        if(f == null)         //check if string is null or not
        {
            break;
        }
        else
            al.Add(f);        //add strings to list
    }`

如何循环Console.ReadLine？

5 个答案: