C# Keywords Tutorial Part 87: typeof

Object-oriented programmers all across the world utilize the well-liked language C#. The typeof keyword, which is used to acquire the System, is only one of the numerous aspects of C#.item of a specific kind. We will examine the typeof keyword and its use using code samples in this blog article.

The Type object, which represents a type, may be obtained in C# using the typeof keyword. This Type object includes information on the type’s name, methods, and attributes. When you need to carry out operations dependent on the type of an object during runtime, this is helpful.

Here is an example that shows the usage of the typeof keyword:

using System;

class Program
{
    static void Main(string[] args)
    {
        Type intType = typeof(int);
        Console.WriteLine(intType.FullName); // Output: System.Int32
    }
}

In the above example, we have obtained the Type object of the int type using the typeof keyword. We then printed the full name of the int type using the FullName property of the Type object.

Another usage of the typeof keyword is when you want to check if an object is of a certain type. Here is an example that demonstrates this:

using System;

class Program
{
    static void Main(string[] args)
    {
        object myObj = 10;
        if (myObj.GetType() == typeof(int))
        {
            Console.WriteLine("myObj is of type int.");
        }
    }
}

In the above example, we have created an object myObj that contains the value 10. We then used the GetType method of the object to obtain its Type object. We then checked if the Type object of myObj is equal to the Type object of the int type obtained using the typeof keyword. If the Type objects are equal, we print a message to the console.

One important thing to note about the typeof keyword is that it can only be used with types that are known at compile-time. This means that you cannot use the typeof keyword with a variable or an expression that evaluates to a type at runtime.