IStructuralEquatable.Equals Method (Object, IEqualityComparer)
Determines whether an object is structurally equal to the current instance.
Assembly: mscorlib (in mscorlib.dll)
The object to compare with the current instance.
An object that determines whether the current instance and other are equal.
Return ValueType: System.Boolean
true if the two objects are equal; otherwise, false.
The IEqualityComparer.Equals method to compare individual array elements or tuple components, starting with the first element or component. The individual calls to IEqualityComparer.Equals end and the method returns a value either when a method call returns false or after all array elements or tuple components have been compared.method supports custom structural comparison of array and tuple objects. This method in turn calls the comparer object's
The default equality comparer, EqualityComparer<Object>.Default.Equals, considers two NaN values to be equal. However, in some cases, you may want the comparison of NaN values for equality to return false, which indicates that the values cannot be compared. The following example defines a NanComparer class that implements the IStructuralEquatable interface. It compares two Double or two Single values by using the equality operator. It passes values of any other type to the default equality comparer.
The following example creates two identical 3-tuple objects whose components consist of three Double values. The value of the second component is Double.NaN. The example then calls the Tuple<'T1, 'T2, 'T3>.Equals method, and it calls the method three times. The first time, it passes the default equality comparer that is returned by the EqualityComparer<'T>.Default property. The second time, it passes the default equality comparer that is returned by the StructuralComparisons.StructuralEqualityComparer property. The third time, it passes the custom NanComparer object. As the output from the example shows, the first three method calls return true, whereas the fourth call returns false.
Available since 4.5
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