Tuple<'T1, 'T2, 'T3>.IStructuralEquatable.Equals Method (Object, IEqualityComparer)
Returns a value that indicates whether the current Tuple<'T1, 'T2, 'T3> object is equal to a specified object based on a specified comparison method.
Assembly: mscorlib (in mscorlib.dll)
private abstract Equals : other:Object * comparer:IEqualityComparer -> bool private override Equals : other:Object * comparer:IEqualityComparer -> bool
The object to compare with this instance.
An object that defines the method to use to evaluate whether the two objects are equal.
Return ValueType: System.Boolean
true if the current instance is equal to the specified object; otherwise, false.
The IEqualityComparer.Equals implementation is called only if other is not null, and if it can be successfully cast (in C#) or converted (in Visual Basic) to a Tuple<'T1, 'T2, 'T3> object whose components are of the same types as the current instance. The method first passes the Item1 values of the Tuple<'T1, 'T2, 'T3> objects to be compared to the IEqualityComparer.Equals implementation. If this method call returns true, the method is called again and passed the Item2 values of the two Tuple<'T1, 'T2, 'T3> objects. If this method call returns true again, the method is called a third time and passed the Item3 values of the two Tuple<'T1, 'T2, 'T3> objects.
The following example defines an Item2Comparer class that implements the IEqualityComparer interface and changes the way in which Tuple<'T1, 'T2, 'T3> objects are evaluated for equality. The method always returns true when it is passed the Item1 property values of two Tuple<'T1, 'T2, 'T3> objects, and it calls the method to evaluate their Item2 property values. If this method call returns true, their Item3 property values are passed to the method, which always returns true. As a result, the method tests for equality based only on the value of the Item2 property. The output illustrates the result for a data set of Tuple<'T1, 'T2, 'T3> objects that record the names, mean test score, and number of tests of students in a class.
Available since 8
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Available since 4.0
Windows Phone Silverlight
Available since 8.0
Available since 8.1