How Can C# Methods Return Multiple Values Efficiently Using Tuples?

Efficient use of the C#tuple to return multiple values ​​

In the programming language, returning multiple values ​​from the method is a common problem, and C#is no exception. Different from the language that needs to be used or referenced, C#provides a simpler way to use the cost group to achieve this purpose.

C# 7 in the Yuan Group

With the introduction of C# 7, Yuan composition has a language characteristics that represents a collection of different types of values. This allows the creation to contain multiple returns that can contain multiple values.

For example, consider a method of searching for names, middle names and surnames based on a given ID. In C# 7, you can define the return type as the meta group:

(string first, string middle, string last) LookupName(long id)

<返> Return to the Yuan Group

Then, the method can retrieve the value and return it as the meta -group:

<> The return of the returned Yuan group

return (first, middle, last);

Code can use the Item property to access the return value:

<命> Naming element elements

var names = LookupName(id);
WriteLine($"found {names.Item1} {names.Item3}.");

C#also provides the function of naming the elements to improve the definition. This can be completed by adding a name to the method signature or Return statement:

or <或者>

<构> deconstruction

(string first, string middle, string last) LookupName(long id)

C# 7 also supports deconstruction. This allows you to easily declare variables with the same name as the element of the tuple and assign a value in a single line:

return (first: first, middle: middle, last: last);

For more examples and details, please refer to the link provided. (The original map should be kept here)

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