C# 将值传递给新方法后，如何使用该值？

因此，我是一名C#程序员初学者，无法让我的程序正常工作。我希望能够使用Main（）方法的用户输入，将其传递给PaintJobCalc（）以计算绘制作业，并将计算结果发送回Main方法。我玩了一个小时，哪儿也去不了

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

class PaintingEstimate
{
    static void Main()
    {
        string[] input = {};

        Write("\n   Type a room length in feet >> ");
        input[0] = ReadLine();
        Write("\n   Type a room width in feet >> ");
        input[1] = ReadLine();

        PaintJobCalc((string[])input.Clone());

    }

    public static void PaintJobCalc(string[] args)
    {
        int inputOne = Convert.ToInt32(input[0]);
        int inputTwo = Convert.ToInt32(input[1]);

        var wallCount = (inputOne + inputTwo) * 2;
        var squareFootage = wallCount * 9;
        var endEstimate = squareFootage * 6;

        WriteLine("\n   Your Paint Job total will be ${0}", endEstimate);

        ReadLine();


    }
}

---

首先，您需要

返回endEstimate

public static int PaintJobCalc(string[] args)
{
       int inputOne = Convert.ToInt32(args[0]);
       int inputTwo = Convert.ToInt32(args[1]);

       var wallCount = (inputOne + inputTwo) * 2;
       var squareFootage = wallCount * 9;
       var endEstimate = squareFootage * 6;
       return endEstimate;
}

注意-将返回类型从

void

交换到

int

与某些编程语言不同，

C

数组不是动态的，你不能有一个空数组，然后在数组中添加项目，并期望它们增长

string[] input = {}; // this is size 0 and won't grow in size

您应该像这样声明数组：

string[] input = new string[2];

static void Main()
{
    string[] input = new string[2];

    Write("\n   Type a room length in feet >> ");
    input[0] = ReadLine();
    Write("\n   Type a room width in feet >> ");
    input[1] = ReadLine();

    int endEstimate = PaintJobCalc(input);
    WriteLine("\n   Your Paint Job total will be ${0}", endEstimate);
    ReadLine();

}

现在，您的主要方法如下所示：

string[] input = new string[2];

static void Main()
{
    string[] input = new string[2];

    Write("\n   Type a room length in feet >> ");
    input[0] = ReadLine();
    Write("\n   Type a room width in feet >> ");
    input[1] = ReadLine();

    int endEstimate = PaintJobCalc(input);
    WriteLine("\n   Your Paint Job total will be ${0}", endEstimate);
    ReadLine();

}

您需要研究如何从函数返回值

请尝试下面的

code

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

class PaintingEstimate
{
    static void Main()
    {
        string[] input = new string[2];

        Write("\n   Type a room length in feet >> ");
        input[0] = ReadLine();
        Write("\n   Type a room width in feet >> ");
        input[1] = ReadLine();

        decimal endEstimate =PaintJobCalc((string[])input);

        WriteLine("\n   Your Paint Job total will be ${0}", endEstimate);

        ReadLine();

    }

    public static void PaintJobCalc(string[] input)
    {
        int inputOne = Convert.ToInt32(input[0]);
        int inputTwo = Convert.ToInt32(input[1]);

        var wallCount = (inputOne + inputTwo) * 2;
        var squareFootage = wallCount * 9;
        var endEstimate = squareFootage * 6;

        return endEstimate;


    }
}

---

由于方法的返回类型为void，因此无法返回任何内容。它不是特定于C语言的，而是在所有编程语言中都是一样的。尝试将方法PaintJobCalc的返回类型更改为int/float（以适合您的需求的为准），并在某个int/float变量上调用它

---

那就行了。祝你好运，你不需要数组。您的方法可以接受两个整数参数并返回整数作为结果。方法签名非常重要，它必须清楚地描述方法的输入。不要用错误的签名使事情模棱两可

public static int PaintJobCalc(int length, int width)
{
    var wallCount = (length + width) * 2;
    var squareFootage = wallCount * 9;
    var endEstimate = squareFootage * 6;

    return endEstimate;
}

static void Main()
{
    Write("\n   Type a room length in feet >> ");
    int length = Convert.ToInt32(ReadLine());

    Write("\n   Type a room width in feet >> ");
    int width = Convert.ToInt32(ReadLine());

    var value = PaintJobCalc(length, width);

    WriteLine("\n   Your Paint Job total will be ${0}", value);
}

---

a） 你是一个业余程序员，除非你把代码手工转换成EXE:）b）你的返回类型是“void”，你需要使用不同的返回类型。看，你不应该在这里使用数组。是的，它可以工作。但这不是正确的方法。看看我的答案。谢谢，这帮了大忙！！嗯，我明白你的意思了。我相信这更接近于我想要实现的目标。