Type.Equals 方法 (System) | Microsoft Learn

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virtual bool Equals(Type ^ o);

public bool Equals (Type o);

public virtual bool Equals (Type? o);

public virtual bool Equals (Type o);

override this.Equals : Type -> bool

Public Function Equals (o As Type) As Boolean

Public Overridable Function Equals (o As Type) As Boolean

Console.WriteLine("{0} == {1}: {2}", a, b, a.Equals(b)); // The Type objects in a and b are not equal, // because they represent different types. a = typeof(Example); b = new Example().GetType(); Console.WriteLine("{0} is equal to {1}: {2}", a, b, a.Equals(b)); // The Type objects in a and b are equal, // because they both represent type Example. b = typeof(Type); Console.WriteLine("typeof({0}).Equals(typeof({1})): {2}", a, b, a.Equals(b)); // The Type objects in a and b are not equal, // because variable a represents type Example // and variable b represents type Type. //Console.ReadLine(); /* This code example produces the following output: System.String == System.Int32: False Example is equal to Example: True typeof(Example).Equals(typeof(System.Type)): False


   open System
type Example() = class end
    let a = typeof<string>
    let b = typeof<int>
    printfn $"{a} == {b}: {a.Equals b}"
    // The Type objects in a and b are not equal,
    // because they represent different types.
    let a = typeof<Example>
    let b = Example().GetType()
    printfn $"{a} is equal to {b}: {a.Equals b}"
    // The Type objects in a and b are equal,
    // because they both represent type Example.
    let b = typeof<Type>
    printfn $"typeof({a}).Equals(typeof({b})): {a.Equals b}"
// The Type objects in a and b are not equal,
// because variable a represents type Example
// and variable b represents type Type.
(* This code example produces the following output:
    System.String == System.Int32: False
    Example is equal to Example: True
    typeof(Example).Equals(typeof(System.Type)): False
   
    Imports System.Reflection
Class Example
    Public Shared Sub Main() 
        Dim a As Type = GetType(System.String)
        Dim b As Type = GetType(System.Int32)
        Console.WriteLine("{0} = {1}: {2}", a, b, a.Equals(b))
        ' The Type objects in a and b are not equal,
        ' because they represent different types.
        a = GetType(Example)
        b = New Example().GetType()
        Console.WriteLine("{0} is equal to {1}: {2}", a, b, a.Equals(b))
        ' The Type objects in a and b are equal,
        ' because they both represent type Example.
        b = GetType(Type)
        Console.WriteLine("typeof({0}).Equals(typeof({1})): {2}", a, b, a.Equals(b))
        ' The Type objects in a and b are not equal,
        ' because variable a represents type Example
        ' and variable b represents type Type.
        'Console.ReadLine()
    End Sub 
End Class
' This code example produces the following output:
'    System.String = System.Int32: False
'    Example is equal to Example: True
'    typeof(Example).Equals(typeof(System.Type)): False
 override bool Equals(System::Object ^ o);
   
   public override bool Equals (object o);
   public override bool Equals (object? o);
   override this.Equals : obj -> bool
   Public Overrides Function Equals (o As Object) As Boolean
   Type t2 = inst as Type;
      if (t2 != null)
         Console.WriteLine("{0} = {1}: {2}", t.Name, t2.Name,
                           t.Equals(t2));
         Console.WriteLine("Cannot cast the argument to a type.");
      Console.WriteLine();                        
// The example displays the following output:
//       Int32 = Int32: True
//       Int32 = String: False
//       Object = Object: True
//       List`1 = List`1: False
//       Cannot cast the argument to a type.
   
    open System
open System.Reflection
let isEqualTo (t: Type) (inst: obj) =
    match inst with
    | :? Type as t2 ->
        printfn $"{t.Name} = {t2.Name}: {t.Equals t2}\n"
    | _ ->
        printfn "Cannot cast the argument to a type.\n"
    let t = typeof<int>
    typeof<int>.GetTypeInfo()
    |> isEqualTo t
    typeof<String>
    |> isEqualTo t
    let t = typeof<obj>
    typeof<obj>
    |> isEqualTo t
    let t = typeof<ResizeArray<_>>.GetGenericTypeDefinition()
    let obj4: obj = (ResizeArray<String>()).GetType()
    isEqualTo t obj4
    let t = typeof<Type>
    let obj5: obj = null
    isEqualTo t obj5
// The example displays the following output:
//       Int32 = Int32: True
//       Int32 = String: False
//       Object = Object: True
//       List`1 = List`1: False
//       Cannot cast the argument to a type.
    
     Imports System.Collections.Generic
Imports System.Reflection
Module Example
   Public Sub Main()
      Dim t As Type = GetType(Integer)
      Dim obj1 As Object = GetType(Integer).GetTypeInfo()
      IsEqualTo(t, obj1)
      Dim obj2 As Object = GetType(String)
      IsEqualTo(t, obj2)
      t = GetType(Object)
      Dim obj3 As Object = GetType(Object)
      IsEqualTo(t, obj3)
      t = GetType(List(Of ))
      Dim obj4 As Object = (New List(Of String())).GetType()
      IsEqualTo(t, obj4)
      t = GetType(Type)
      Dim obj5 As Object = Nothing
      IsEqualTo(t, obj5)
   End Sub
   Private Sub IsEqualTo(t As Type, inst As Object)
      Dim t2 As Type = TryCast(inst, Type)
      If t2 IsNot Nothing Then
         Console.WriteLine("{0} = {1}: {2}", t.Name, t2.Name,
                           t.Equals(t2))
         Console.WriteLine("Cannot cast the argument to a type.")
      End If
      Console.WriteLine()                        
   End Sub
End Module
' The example displays the following output:
'       Int32 = Int32: True
'       Int32 = String: False
'       Object = Object: True
'       List`1 = List`1: False
'       Cannot cast the argument to a type.
     
      這兩件事特別值得注意範例：
     
     
      
       物件比較
       
        Type
       
       ，該物件代表整數，且
       
        TypeInfo
       
       物件代表整數傳回
       
        true
       
       ，因為
       
        TypeInfo
       
       衍生自
       
        Type
       
       。
      
     
     
      
       物件比較
       
        Type
       
       ，表示
       
        IList<T>
       
       物件 (開啟泛型型別) 物件
       
        List(Of String)
       
       ， (封閉式泛型型別) 傳
       
        false
       
       回 。
      
      即將登場：在 2024 年，我們將逐步淘汰 GitHub 問題作為內容的意見反應機制，並將它取代為新的意見反應系統。 如需詳細資訊，請參閱：
      
       https://aka.ms/ContentUserFeedback
      
      。
      
      
      
       提交並檢視相關的意見反應