brief introduction

Tuples use generics to simplify the definition of classes , Mostly used for the return value of the method . When a function needs to return multiple types , You don't have to use out , ref Wait for keywords , Define a Tuple type , It is very convenient to use

Example

When we program , For example, a person's information , We often create a UserInformation Class to describe a person , The traditional approach is as follows :

public class UserInformation
    { 
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }
          static UserInformation GetUserInformation()
        {
            return new UserInformation { FirstName = " Zhang San ", LastName = " Li Si " };
        }

So what can we do with tuples ？ As shown below

static Tuple<string, string> GetUserInformation3()
        {
            return new Tuple<string,string> ( " Zhang San ", " Li Si " );
        }
           var tuple = GetUserInformation1();
          string firstName=  tuple.Item1;
            string lastName = tuple.Item2;

Item1 Represents the first attribute value ,Item2 Represents the second attribute value , Of course if you use Item1 and item2 Poor readability , Don't look at the method, don't know at all Item1 What does it mean , Then we can use anonymous types , As shown below :

var ( first, last) = GetUserInformation1();

first Is our first attribute value ,last Is our second attribute value . stay C#7.0 It provides a more concise Syntax , It is used to divide multiple data elements into a lightweight data structure

static (string, string) GetUserInformation1()
        {
            return  (" Zhang San ", " Li Si ");
        }

Of course, it also supports anonymous types to obtain attribute values

var(first,last)= GetUserInformation1();

To learn more tuple types, go to :https://docs.microsoft.com/zh-cn/dotnet/csharp/language-reference/builtin-types/value-tuples

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