# Tuple<T1, T2, T3, T4, T5, T6, T7, TRest> Constructor

**.NET Framework 4.6 and 4.5**

Initializes a new instance of the Tuple<T1, T2, T3, T4, T5, T6, T7, TRest> class.

**Namespace:**System

**Assembly:**mscorlib (in mscorlib.dll)

```
public Tuple(
T1 item1,
T2 item2,
T3 item3,
T4 item4,
T5 item5,
T6 item6,
T7 item7,
TRest rest
)
```

#### Parameters

- item1
- Type: T1
The value of the tuple's first component.

- item2
- Type: T2
The value of the tuple's second component.

- item3
- Type: T3
The value of the tuple's third component.

- item4
- Type: T4
The value of the tuple's fourth component

- item5
- Type: T5
The value of the tuple's fifth component.

- item6
- Type: T6
The value of the tuple's sixth component.

- item7
- Type: T7
The value of the tuple's seventh component.

- rest
- Type: TRest
Any generic Tuple object that contains the values of the tuple's remaining components.

Exception | Condition |
---|---|

ArgumentException | rest is not a generic Tuple object. |

You can also use the static Tuple.Create method to instantiate an 8-tuple (octuple) object without having to explicitly specify the types of its components. The following example uses the Tuple.Create method to instantiate an 8-tuple object that contains prime numbers that are less than 20.

var primes = Tuple.Create(2, 3, 5, 7, 11, 13, 17, 19); Console.WriteLine("Prime numbers less than 20: " + "{0}, {1}, {2}, {3}, {4}, {5}, {6}, and {7}", primes.Item1, primes.Item2, primes.Item3, primes.Item4, primes.Item5, primes.Item6, primes.Item7, primes.Rest.Item1); // The example displays the following output: // Prime numbers less than 20: 2, 3, 5, 7, 11, 13, 17, and 19

This is equivalent to the following call to the Tuple<T1, T2, T3, T4, T5, T6, T7> class constructor.

However, the static Tuple.Create method cannot be used to create a tuple object with more than eight components.

When using the Tuple<T1, T2, T3, T4, T5, T6, T7, TRest> constructor to create an n-tuple with eight or more components, you use the rest parameter to create a nested n-tuple that has from one to seven components. By using successive levels of nesting, you can create an n-tuple that has a virtually unlimited number of components. For example, to create a 25-tuple, you instantiate a Tuple<T1, T2, T3, T4, T5, T6, T7, TRest> object with three levels of nesting, as follows:

The outermost Tuple<T1, T2, T3, T4, T5, T6, T7, TRest> object contains the first through seventh components. Its Rest property provides access to an Tuple<T1, T2, T3, T4, T5, T6, T7, TRest> object at the first level of nesting.

The outermost nested Tuple<T1, T2, T3, T4, T5, T6, T7, TRest> object contains the eighth through fourteenth components, and its Rest property provides access to an Tuple<T1, T2, T3, T4, T5, T6, T7, TRest> object at the second level of nesting.

The Tuple<T1, T2, T3, T4, T5, T6, T7, TRest> object at the second level of nesting contains the fifteenth through twenty-first components, and its Rest property provides access to an Tuple<T1, T2, T3, T4> object at the third level of nesting.

The innermost tuple is a Tuple<T1, T2, T3, T4> object that contains the twenty-second through twenty-fifth components.

The following example creates a 17-tuple that contains population data for the city of Detroit, Michigan, for each census from 1860 to 2000. The first component of the tuple is the city name. The second component is the start date of the series of data, and the third component is the population at the start date. Each subsequent component provides the population at decade intervals. The example uses two layers of nesting to create the 17-tuple: It defines a 7-tuple whose third through seventh components contain population data for 1860 through 1900, a nested 7-tuple that contains population data for 1910 through 1970, and an inner nested 3-tuple that contains population data for 1980 through 2000.

var from1980 = Tuple.Create(1203339, 1027974, 951270); var from1910 = new Tuple<int, int, int, int, int, int, int, Tuple<int, int, int>> (465766, 993078, 1568622, 1623452, 1849568, 1670144, 1511462, from1980); var population = new Tuple<string, int, int, int, int, int, int, Tuple<int, int, int, int, int, int, int, Tuple<int, int, int>>> ("Detroit", 1860, 45619, 79577, 116340, 205876, 285704, from1910);