Type.Equals Method

Definition

Determines if the underlying system type of the current Type is the same as the underlying system type of the specified Object or Type.

Overloads

Equals(Type)

Determines if the underlying system type of the current Type is the same as the underlying system type of the specified Type.

Equals(Object)

Determines if the underlying system type of the current Type object is the same as the underlying system type of the specified Object.

Equals(Type)

Source:
Type.cs
Source:
Type.cs
Source:
Type.cs

Determines if the underlying system type of the current Type is the same as the underlying system type of the specified Type.

public bool Equals (Type o);
public virtual bool Equals (Type? o);
public virtual bool Equals (Type o);

Parameters

o
Type

The object whose underlying system type is to be compared with the underlying system type of the current Type.

Returns

true if the underlying system type of o is the same as the underlying system type of the current Type; otherwise, false.

Implements

Examples

The following example uses Equals to compare two types.


using System;
using System.Reflection;

class Example
{
    public static void Main()
    {

        Type a = typeof(System.String);
        Type b = typeof(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 = 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
*/

See also

Applies to

.NET 9 и другие версии
Продукт Версии
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1
UWP 10.0

Equals(Object)

Source:
Type.cs
Source:
Type.cs
Source:
Type.cs

Determines if the underlying system type of the current Type object is the same as the underlying system type of the specified Object.

public override bool Equals (object o);
public override bool Equals (object? o);

Parameters

o
Object

The object whose underlying system type is to be compared with the underlying system type of the current Type. For the comparison to succeed, o must be able to be cast or converted to an object of type Type.

Returns

true if the underlying system type of o is the same as the underlying system type of the current Type; otherwise, false. This method also returns false if:

  • o is null.

  • o cannot be cast or converted to a Type object.

Implements

Examples

The following example uses Equals(Object) to compare various Type object instances with various Object instances.

using System;
using System.Collections.Generic;
using System.Reflection;

public class Example
{
   public static void Main()
   {
      Type t =typeof(int);
      Object obj1 = typeof(int).GetTypeInfo();
      IsEqualTo(t, obj1);

      Object obj2 = typeof(String);
      IsEqualTo(t, obj2);
      
      t = typeof(Object);
      Object obj3 = typeof(Object);
      IsEqualTo(t, obj3);
      
      t = typeof(List<>);
      Object obj4 = (new List<String>()).GetType();
      IsEqualTo(t, obj4);
      
      t = typeof(Type);
      Object obj5 = null;
      IsEqualTo(t, obj5);
   }
   
   private static void IsEqualTo(Type t, Object inst)
   {
      Type t2 = inst as Type;
      if (t2 != null)
         Console.WriteLine("{0} = {1}: {2}", t.Name, t2.Name,
                           t.Equals(t2));
      else
         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.

Two things are particularly worth noting about the example:

  • The comparison of a Type object that represents an integer with a TypeInfo object that represents an integer return true because TypeInfo is derived from Type.

  • The comparison of a Type object that represents a IList<T> object (an open generic type) with a List(Of String) object (a closed generic type) returns false.

Remarks

This method overrides Object.Equals. It casts o to an object of type Type and calls the Type.Equals(Type) method.

See also

Applies to

.NET 9 и другие версии
Продукт Версии
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1
UWP 10.0