Tuple(T1, T2, T3, T4) Class
Represents a 4-tuple, or quadruple.
Assembly: mscorlib (in mscorlib.dll)
[<SerializableAttribute>] type Tuple<'T1, 'T2, 'T3, 'T4> = class interface IStructuralEquatable interface IStructuralComparable interface IComparable end
The type of the tuple's first component.
The type of the tuple's second component.
The type of the tuple's third component.
The type of the tuple's fourth component.
Thetype exposes the following members.
|Equals||Returns a value that indicates whether the current object is equal to a specified object. (Overrides Object.Equals(Object).)|
|Finalize||Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)|
|GetHashCode||Returns the hash code for the current object. (Overrides Object.GetHashCode().)|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|MemberwiseClone||Creates a shallow copy of the current Object. (Inherited from Object.)|
|ToString||Returns a string that represents the value of this instance. (Overrides Object.ToString().)|
|IComparable.CompareTo||Compares the current object to a specified object and returns an integer that indicates whether the current object is before, after, or in the same position as the specified object in the sort order.|
|IStructuralComparable.CompareTo||Compares the current object to a specified object by using a specified comparer and returns an integer that indicates whether the current object is before, after, or in the same position as the specified object in the sort order.|
|IStructuralEquatable.Equals||Returns a value that indicates whether the current object is equal to a specified object based on a specified comparison method.|
|IStructuralEquatable.GetHashCode||Calculates the hash code for the current object by using a specified computation method.|
A tuple is a data structure that has a specific number and sequence of values. The class represents a 4-tuple, or quadruple, which is a tuple that has four components.
You can instantiate a object by calling either the Tuple(T1, T2, T3, T4) constructor or the static Tuple.Create(T1, T2, T3, T4)(T1, T2, T3, T4) method. You can retrieve the value of the tuple's components by using the read-only Item1, Item2, Item3, and Item4 instance properties.
Tuples are commonly used in four different ways:
To represent a single set of data. For example, a tuple can represent a database record, and its components can represent individual fields of the record.
To provide easy access to, and manipulation of, a data set. The following example defines an array of objects that contain the names of baseball pitchers, the number of innings they pitched, and the number of earned runs (runs that scored without fielding errors), and hits that they gave up. The array is passed to the ComputeStatistics method, which calculates each pitcher's earned run average (the average number of runs given up in a nine-inning game), and the average number of hits given up per inning. The method also uses these two averages to compute a hypothetical effectiveness average.
To return multiple values from a method without the use of out parameters (in C#) or ByRef parameters (in Visual Basic). For example, the previous example returns its computed statistics, along with the name of the pitcher, in an array of objects.
To pass multiple values to a method through a single parameter. For example, the Thread.Start(Object) method has a single parameter that lets you supply one value to the method that the thread executes at startup. If you supply a object as the method argument, you can supply the thread’s startup routine with four items of data.