UriTemplateEquivalenceComparer 类

定义

命名空间:

System

程序集:

System.ServiceModel.dll

一个用于比较 UriTemplate 实例以确定结构（而非引用）等效性的类。

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)

继承

Object

UriTemplateEquivalenceComparer

实现

IEqualityComparer<UriTemplate>

示例

下面的示例说明了引用相等性和结构相等性之间的差异。 同时也说明了在字典中使用 UriTemplateEquivalenceComparer 作为比较器的方法。

// 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

注解

默认情况下，使用引用相等性来比较 UriTemplate 实例。 UriTemplateEquivalenceComparer 类会使用 IsEquivalentTo(UriTemplate) 而非默认的引用相等性检查来评估等效性。 如果希望根据与两个 UriTemplate 实例匹配的 URI 而非严格的引用相等性来比较这两个实例，则此类会非常有用。

构造函数

UriTemplateEquivalenceComparer()

初始化 UriTemplateEquivalenceComparer 类的新实例。

方法

Equals(Object)	确定指定对象是否等于当前对象。 (继承自 Object)
Equals(UriTemplate, UriTemplate)	比较两个 UriTemplate 实例是否等效。
GetHashCode()	作为默认哈希函数。 (继承自 Object)
GetHashCode(UriTemplate)	获取所指定 UriTemplate 实例的哈希代码。
GetType()	获取当前实例的 Type。 (继承自 Object)
MemberwiseClone()	创建当前 Object 的浅表副本。 (继承自 Object)
ToString()	返回表示当前对象的字符串。 (继承自 Object)