如何循环Console.ReadLine

本文关键字：Console ReadLine 循环 何循环 | 更新日期: 2023-09-27 18:10:59

我不知道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，让我存储用户输入的内容，并在他输入exit时退出。

 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;
    }
}

如何循环Console.ReadLine

您需要的笔记列表，以便添加尽可能多的笔记，因为你想。此外，如果用户确实要求退出，则需要首先保存ReadLine输入检查，否则继续添加注释。

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);
}

一般的格式是这样的(while循环和break条件):

// 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
}

您将需要编辑进入该循环主体的内容，这取决于您想要对注释实例做什么。但一般来说，您会反复提示用户输入，直到满足某个条件，然后跳出循环。你可以决定那个条件(例如:"输入10个音符";"退出型";等)

根据@n0rd的评论，这是如何做的…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));

要循环Console.ReadLine()，可以使用 

    `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
    }`

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().ToLower()) != exitKey)
{ //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
}

: 

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

是循环发生的地方。如果条目不等于exitKey，则重复上述步骤。

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