如何重命名 return 个元组项？

Question

我是 C# 新功能 Called as Tuples 的新手。我在元组上写了一些代码。当元组是 return 方法时（元组包含多个值）。

即

string firstNumber = separateNumbers.Item1;
string secondNumber = separateNumbers.Item2;
string thirdNumber = separateNumbers.Item3;
string fourthNumber = separateNumbers.Item4;

在真实场景中，识别哪个项目包含哪个值变得很复杂？

所以我想提供一些特定的名称，而不是 item1、item2 等... 怎么做？

提前致谢。

代码：

namespace CSharp_Tuples
{
    class Program
    {
        static void Main(string[] args)
        {
            string PhoneNumbers = "+92315 +92316 +92317 +92318";
            var separateNumbers = GetIndividualNumbers(PhoneNumbers);

            string firstNumber = separateNumbers.Item1;
            string secondNumber = separateNumbers.Item2;
            string thirdNumber = separateNumbers.Item3;
            string fourthNumber = separateNumbers.Item4;

            Console.WriteLine(firstNumber);
            Console.WriteLine(secondNumber);
            Console.WriteLine(thirdNumber);
            Console.WriteLine(fourthNumber);

        }
        static Tuple<string, string, string, string> GetIndividualNumbers(string allNumbers)
        {
            string[] numbers  = allNumbers.Split(' ');
            return Tuple.Create<string,string,string,string>(numbers[0],numbers[1],numbers[2],numbers[3]);
        }
    }
}

Answer 1

我进一步研究了这个问题，得出了结论。

结论：

关于问题：

So I want to provide some specific name instead of item1,item2, etc... How to do that ?

元组不允许我们重命名 return 值相反我们可以利用 匿名类型.

代码：

namespace CSharp_Tuples
{
    class Program
    {
        static void Main(string[] args)
        {
            string PhoneNumbers = "+92315 +92316 +92317 +92318";

            //var separateNumbers = GetIndividualNumbers(PhoneNumbers);

            //string firstNumber = separateNumbers.Item1;
            //string secondNumber = separateNumbers.Item2;
            //string thirdNumber = separateNumbers.Item3;
            //string fourthNumber = separateNumbers.Item4;

            //Console.WriteLine(firstNumber);
            //Console.WriteLine(secondNumber);
            //Console.WriteLine(thirdNumber);
            //Console.WriteLine(fourthNumber);


            var numbers = Cast(usingAnonymouseObject(PhoneNumbers), new {
                                                                        firstNumber = "",
                                                                        secondNumer = "",
                                                                        thirdNumber = "",
                                                                        fourthNumber = ""
                                                                        });
            Console.WriteLine("firstNumber : " + numbers.firstNumber);
            Console.WriteLine("secondNumber : " + numbers.secondNumer);
            Console.WriteLine("thirdNumber : " + numbers.thirdNumber);
            Console.WriteLine("fourthNumber : " + numbers.fourthNumber);


        }
        //static Tuple<string, string, string, string> GetIndividualNumbers(string allNumbers)
        //{
        //    string[] numbers  = allNumbers.Split(' ');
        //    return Tuple.Create<string,string,string,string>(numbers[0],numbers[1],numbers[2],numbers[3]);
        //}

        static object usingAnonymouseObject(string allNumbers)
        {
            string[] numbers = allNumbers.Split(' ');
            return new { firstNumber = numbers[0], secondNumer = numbers[1], thirdNumber = numbers[2], fourthNumber = numbers[3] };
        }

        static T Cast<T>(object obj, T type)
        {
            return (T)obj;
        }
    }
}

Answer 2

C# 7.0 tuples feature uses ValueTuple, not the old Tuple.

使用该功能，您可以执行以下操作：

namespace CSharp_Tuples
{
    class Program
    {
        static void Main(string[] args)
        {
            string PhoneNumbers = "+92315 +92316 +92317 +92318";

            var numbers = UsingValueTuple(PhoneNumbers);

            Console.WriteLine("firstNumber : " + numbers.firstNumber);
            Console.WriteLine("secondNumber : " + numbers.secondNumer);
            Console.WriteLine("thirdNumber : " + numbers.thirdNumber);
            Console.WriteLine("fourthNumber : " + numbers.fourthNumber);
        }

        static (string firstNumber, string secondNumer, string thirdNumber, string fourthNumber) UsingValueTuple(string allNumbers)
        {
            string[] numbers = allNumbers.Split(' ');
            return (numbers[0], numbers[1], numbers[2], numbers[3]);
        }
    }
}

如何重命名 return 个元组项？

How to rename return Tuples Items?

c#

methods

tuples

console-application

c#-7.0