我是C#新功能的新手，稱為元組。我在元組上寫了一些代碼。當元組由方法返回時（元組包含多個值）。斷續器string firstNumber = separateNumbers.Item1;string secondNumber = separateNumbers.Item2;string thirdNumber = separateNumbers.Item3;string fourthNumber = separateNumbers.Item4;在實際的單詞場景中，識別哪個項目包含哪個值變得復雜？所以我想提供一些具體的名稱，而不是項目1，項目2等...如何做到這一點？提前致謝。法典：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]); } }}
2 回答
慕田峪9158850
TA貢獻1794條經驗 獲得超7個贊
C# 7.0 元組功能使用 ValueTuple，而不是舊的元組。
使用該功能，您可以執行如下操作：
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]);
}
}
}
繁華開滿天機
TA貢獻1816條經驗 獲得超4個贊
進一步我研究了這個問題，我得到了結論。
結論：
關于問題：
所以我想提供一些具體的名稱，而不是項目1，項目2等...如何做到這一點？
元組不允許我們重命名返回值，相反，我們可以使用匿名類型。
法典：
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;
}
}
}
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