如何在方法中使用param数组传递字符串参数？ [英] how to pass string parameter with param array in method?

问题描述

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

class ParamParmeters
{

    public int sum(string name, params int[] marks)
    {
        int sum = 0;
        foreach (int element in marks)
        {

            sum += element;

        }
        return sum;


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


        ParamParmeters pp = new ParamParmeters();

        int result = pp.sum("ABC", 10, 20, 30);


        Console.WriteLine(result);



    }
}

我得到输出有60。我需要输出ABC 60

I just get the output has 60 . I need output has "ABC 60"

推荐答案

你不能从 int 方法返回一个字符串！



试试这个：

You can't return a string from an int method!

Try this:

public string sum(string name, params int[] marks)
{
    int sum = 0;
    foreach (int element in marks)
    {
        sum += element;
    }
    return string.Format("{0} {1}", name, sum);
}

然后：

And then:

string result = pp.sum("ABC", 10, 20, 30);

返回字符串，而不是返回 int 并在开头添加字符串参数：

Instead of returning an int, return a string and add the string parameter at the start:

public string sum(string name, params int[] marks) // change "public int" into "public string"
{
    int sum = 0;
    foreach (int element in marks)
    { 
        sum += element;
    }
    return String.Concat(name, " ", sum);
}

此外，如果您使用的是.NET 3.5或更高版本，则无需使用foreach获取总和循环，然后你可以使用总和 [ ^ ]方法：

Also, if you use .NET 3.5 or later, it is not necessary to take the sum using a foreach loop, then you can just use the Sum[^] method:

public string sum(string name, params int[] marks)
{
    int sum = marks.Sum();
    return String.Concat(name, " ", sum);
}

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