UriTemplateEquivalenceComparer Klasse

Definition

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)

Vererbung

Object

UriTemplateEquivalenceComparer

Implementiert

IEqualityComparer<UriTemplate>

Beispiele

Das folgende Beispiel zeigt den Unterschied zwischen Bezugsgleichheit und struktureller Gleichheit. Außerdem wird gezeigt, wie Sie den UriTemplateEquivalenceComparer Als Vergleicher in einem Wörterbuch verwenden.

// 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

Hinweise

UriTemplate Instanzen werden standardmäßig mithilfe der Referenzgleichheit verglichen. Die UriTemplateEquivalenceComparer Klasse wertet die Äquivalenz anstelle IsEquivalentTo(UriTemplate) der Standardüberprüfung der Referenzgleichheit aus. Diese Klasse ist nützlich, wenn Sie zwei UriTemplate Instanzen basierend auf den URIs vergleichen möchten, die sie abgleichen, anstelle der strengen Referenzgleichheit.