Get the handle for the Type of a specified object C#

To get the handle for the Type of a specified object in C#, you use the Type.GetTypeHandle() method. This method returns a RuntimeTypeHandle structure that represents the type handle, which is a unique identifier for the type in the runtime environment.

A type handle is useful for low-level operations and provides a lightweight way to reference types without keeping the full Type object in memory.

Syntax

Following is the syntax for getting a type handle −

RuntimeTypeHandle handle = Type.GetTypeHandle(objectInstance);

To convert back from handle to Type −

Type type = Type.GetTypeFromHandle(handle);

Parameters

• objectInstance − The object whose type handle you want to retrieve

Return Value

Returns a RuntimeTypeHandle structure that represents the type of the specified object.

Using Type Handle with System.Type

Example

using System;

public class Demo {
    public static void Main() {
        Type type1 = typeof(System.Type);
        RuntimeTypeHandle typeHandle = Type.GetTypeHandle(type1);
        Type type = Type.GetTypeFromHandle(typeHandle);
        Console.WriteLine("Attributes = " + type.Attributes);
        Console.WriteLine("Type Referenced = " + type);
    }
}

The output of the above code is −

Attributes = AutoLayout, AnsiClass, Class, Serializable, BeforeFieldInit
Type Referenced = System.RuntimeType

Using Type Handle with Built-in Types

Example

using System;

public class Demo {
    public static void Main() {
        Type type1 = typeof(double);
        RuntimeTypeHandle typeHandle = Type.GetTypeHandle(type1);
        Type type = Type.GetTypeFromHandle(typeHandle);
        Console.WriteLine("Attributes = " + type.Attributes);
        Console.WriteLine("Type Referenced = " + type);
        Console.WriteLine("Is Value Type = " + type.IsValueType);
        Console.WriteLine("Full Name = " + type.FullName);
    }
}

The output of the above code is −

Attributes = AutoLayout, AnsiClass, Class, Serializable, BeforeFieldInit
Type Referenced = System.Double
Is Value Type = True
Full Name = System.Double

Using Type Handle with Custom Objects

Example

using System;

public class Student {
    public string Name { get; set; }
    public int Age { get; set; }
}

public class Demo {
    public static void Main() {
        Student student = new Student { Name = "John", Age = 20 };
        RuntimeTypeHandle typeHandle = Type.GetTypeHandle(student);
        Type type = Type.GetTypeFromHandle(typeHandle);
        
        Console.WriteLine("Type Name = " + type.Name);
        Console.WriteLine("Assembly = " + type.Assembly.GetName().Name);
        Console.WriteLine("Is Class = " + type.IsClass);
        Console.WriteLine("Base Type = " + type.BaseType);
    }
}

The output of the above code is −

Type Name = Student
Assembly = prog
Is Class = True
Base Type = System.Object

Conclusion

The Type.GetTypeHandle() method provides a lightweight way to get a runtime handle for any object's type. This handle can be converted back to a Type object using Type.GetTypeFromHandle(), making it useful for efficient type operations and comparisons in performance-critical scenarios.