C# | Type.Equals() Method

Type.Equals() Method is used to check whether the underlying system type of the current Type is the same as the underlying system type of the specified Object or Type. There are 2 methods in the overload list of this method as follows:

• Equals(Type) Method
• Equals(Object) Method

Type.Equals(Type) Method

This method is used to check whether the underlying system type of the current Type is the same as the underlying system type of the specified Type.

Syntax: public virtual bool Equals (Type o);
Here, it takes the object whose underlying system type is to be compared with the underlying system type of the current Type.

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

Below programs illustrate the use of Type.Equals() Method:

Example 1:

// C# program to demonstrate the
// Type.Equals(Type) Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {
        // Declaring and initializing value1
        Type value1 = typeof(System.String);

        // Declaring and initializing value2
        Type value2 = typeof(System.Int32);

        // using Equals(Type) method
        bool status = value1.Equals(value2);

        // checking the status
        if (status)
            Console.WriteLine("{0} is equal to {1}",
                                    value1, value2);
        else
            Console.WriteLine("{0} is not equal to {1}",
                                        value1, value2);
    }
}

Output:

System.String is not equal to System.Int32

Example 2:

// C# program to demonstrate the
// Type.Equals(Type) Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {

        // calling get() method
        get(typeof(System.String), typeof(System.String));
        get(typeof(System.String), typeof(System.Int32));
        get(typeof(System.Decimal), typeof(System.Double));
    }

    // defining get() method
    public static void get(Type value1,
                           Type value2)
    {

        // using Equals(Type) method
        bool status = value1.Equals(value2);

        // checking the status
        if (status)
            Console.WriteLine("{0} is equal to {1}",
                                    value1, value2);
        else
            Console.WriteLine("{0} is not equal to {1}",
                                        value1, value2);
    }
}

Output:

System.String is equal to System.String
System.String is not equal to System.Int32
System.Decimal is not equal to System.Double

Type.Equals(Object) Method

This method is used to check whether the underlying system type of the current defined Type object is exactly same as the underlying system type of the specified Object.

Syntax: public override bool Equals (object obj);
Here, it takes the object whose underlying system type is to be compared with the underlying system type of the current Type. For the comparison to succeed, obj must be able to be cast or converted to an object of type Type.

Return Value: This method returns true if the underlying system type of obj is the same as the underlying system type of the current Type otherwise, it returns false. This method also returns false if obj is null or cannot be cast or converted to a Type object.

Below programs illustrate the use of the above-discussed method:

Example 1:

// C# program to demonstrate the
// Type.Equals(Object) Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {
        // Declaring and initializing value1
        Type value1 = typeof(int);

        // Declaring and initializing value2
        object value2 = typeof(int);

        // using Equals(Object) method
        bool status = value1.Equals(value2);

        // checking the status
        if (status)
            Console.WriteLine("{0} is equal to {1}",
                                    value1, value2);
        else
            Console.WriteLine("{0} is not equal to {1}",
                                        value1, value2);
    }
}

Output:

System.Int32 is equal to System.Int32

Example 2:

// C# program to demonstrate the
// Type.Equals(Object) Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {
        // calling get() method
        get(typeof(int), new Object());
        get(typeof(System.String), (object)5.5);
        get(typeof(System.String), null);
    }

    // defining get() method
    public static void get(Type value1,
                           object value2)
    {

        // using Equals(Object) method
        bool status = value1.Equals(value2);

        // checking the status
        if (status)
            Console.WriteLine("{0} is equal to {1}",
                                    value1, value2);
        else
            Console.WriteLine("{0} is not equal to {1}",
                                        value1, value2);
    }
}

Output:

System.Int32 is not equal to System.Object
System.String is not equal to 5.5
System.String is not equal to

Reference:

• https://docs.microsoft.com/en-us/dotnet/api/system.type.equals?view=netcore-3.0