C# 元组、匿名对象、ref&out

元组

private (int number,int newNumber) CaculateByTuple(int number){    return (number: number,        newNumber: number * number);}private List<(int number, int newNumber)> CaculateByTuple(List numbers){    return numbers.AsEnumerable().Select(        x =>        {            return (number: x,            newNumber: x * x);        })        .ToList();}

匿名对象

private dynamic CaculateByDynamic(int number){    return new    {        number = number,        newNumber = number * number    };}

ref&out

ref

private int CaculateByRef(ref int number){    //对于ref    //在进入方法CaculateByRef之前，number必须赋值    //在方法CaculateByRef里面，number可以不进行修改    number = 2;    return number * number;}

out

private int CaculateByOut(out int number){    //对于ref    //在进入方法CaculateByOut之前，number不必赋值    //在方法CaculateByOut里面，number必须进行赋值    number = 3;    return number * number;}

ref&out的坏处在于:
查询number值的引用时，只能查询到ref&out这个方法名上面，对于IDE来说，方法修改了一个变量值，而不是修改了number
在开发过程中的查询检索会遇到困难，如下所示：

测试方法

public void Test(){    //ref    int number = 1;    int newNumber=CaculateByRef(ref number);    //out    newNumber = CaculateByOut(out number);    //元组    var returnValues = CaculateByTuple(number);    number = returnValues.number;    newNumber = returnValues.newNumber;    //匿名对象    var returnValues2 = CaculateByDynamic(number);    number = returnValues2.number;    newNumber = returnValues2.newNumber;    //元组2    List numbers = new List();    numbers.Add(1);    numbers.Add(2);    numbers.Add(3);    var returnValues3 = CaculateByTuple(numbers);}

示例

https://github.com/zLulus/NotePractice/blob/dev3/Console/ConsoleDemo/ReturnsMultipleValuesTest.cs