UriTemplateEquivalenceComparer Clase

Definición

public ref class UriTemplateEquivalenceComparer : System::Collections::Generic::IEqualityComparer<UriTemplate ^>

public class UriTemplateEquivalenceComparer : System.Collections.Generic.IEqualityComparer<UriTemplate>

type UriTemplateEquivalenceComparer = class
    interface IEqualityComparer<UriTemplate>

Public Class UriTemplateEquivalenceComparer
Implements IEqualityComparer(Of UriTemplate)

Herencia

Object

UriTemplateEquivalenceComparer

Implementaciones

IEqualityComparer<UriTemplate>

Ejemplos

En el ejemplo siguiente se muestra la diferencia entre la igualdad de referencia y la igualdad estructural. También muestra cómo usar UriTemplateEquivalenceComparer como comparador en un diccionario.

// Define two structurally equivalent templates
UriTemplate temp1 = new UriTemplate("weather/{state}/{city}");
UriTemplate temp2 = new UriTemplate("weather/{country}/{village}");

// Notice they are not reference equal, in other words
// they are do not refer to the same object
if (temp1 == temp2)
    Console.WriteLine("{0} and {1} are reference equal", temp1, temp2);
else
    Console.WriteLine("{0} and {1} are NOT reference equal", temp1, temp2);

// Notice they are structrually equal
if (temp1.IsEquivalentTo(temp2))
    Console.WriteLine("{0} and {1} are structurally equal", temp1, temp2);
else
    Console.WriteLine("{0} and {1} are NOT structurally equal", temp1, temp2);

// Create a dictionary and use UriTemplateEquivalenceComparer as the comparer
Dictionary<UriTemplate, object> templates = new Dictionary<UriTemplate, object>(new UriTemplateEquivalenceComparer());

// Add template 1 into the dictionary
templates.Add(temp1, "template1");

// The UriTemplateEquivalenceComparer will be used here to compare the template in the table with template2
// they are structurally equivalent, so ContainsKey will return true.
if (templates.ContainsKey(temp2))
    Console.WriteLine("Both templates hash to the same value");
else
    Console.WriteLine("Both templates do NOT hash to the same value");

'Define two structurally equivalent templates
Dim temp1 As UriTemplate = New UriTemplate("weather/{state}/{city}")
Dim temp2 As UriTemplate = New UriTemplate("weather/{country}/{village}")

'Notice they are not reference equal, in other words
'they are do not refer to the same object
If temp1.Equals(temp2) Then
    Console.WriteLine("{0} and {1} are reference equal", temp1, temp2)
Else
    Console.WriteLine("{0} and {1} are NOT reference equal", temp1, temp2)
End If

'Notice they are structrually equal
If (temp1.IsEquivalentTo(temp2)) Then
    Console.WriteLine("{0} and {1} are structurally equal", temp1, temp2)
Else
    Console.WriteLine("{0} and {1} are NOT structurally equal", temp1, temp2)
End If

'Create a dictionary and use UriTemplateEquivalenceComparer as the comparer
Dim templates As Dictionary(Of UriTemplate, Object) = New Dictionary(Of UriTemplate, Object)(New UriTemplateEquivalenceComparer())

'Add template 1 into the dictionary
templates.Add(temp1, "template1")

'The UriTemplateEquivalenceComparer will be used here to compare the template in the table with template2
'they are structurally equivalent, so ContainsKey will return true.
If (templates.ContainsKey(temp2)) Then
    Console.WriteLine("Both templates hash to the same value")
Else
    Console.WriteLine("Both templates do NOT hash to the same value")
End If

Comentarios

UriTemplate Las instancias se comparan con la igualdad de referencia de forma predeterminada. La UriTemplateEquivalenceComparer clase evalúa la equivalencia mediante IsEquivalentTo(UriTemplate) en lugar de la comprobación de igualdad de referencia predeterminada. Esta clase es útil cuando desea comparar dos UriTemplate instancias en función de los URI que coinciden en lugar de la igualdad de referencia estricta.