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How do you call the multiple constructors of a class with single object creation?

In C#, you can call multiple constructors of a class with a single object creation using constructor chaining. Constructor chaining allows you to invoke one constructor from another constructor within the same class. This allows you to reuse initialization logic and avoid code duplication.

To achieve constructor chaining, you use the 'this' keyword followed by the appropriate constructor parameters. The 'this' keyword refers to the current instance of the class. By using 'this' to call another constructor, you can pass the required parameters and execute the common initialization logic.

Here's an example of how to use constructor chaining in a class: 


class MyClass
{
    public int Value1;
    public int Value2;

    // Constructor with one parameter
    public MyClass(int value1) : this(value1, 0)
    {
        // This constructor calls the constructor with two parameters, passing 'value1' and '0'
        // It allows us to reuse the logic and avoid code duplication
    }

    // Constructor with two parameters
    public MyClass(int value1, int value2)
    {
        this.Value1 = value1;
        this.Value2 = value2;
    }
}

In the above example, we have two constructors in the 'MyClass' class. The first constructor takes one parameter ('value1') and uses constructor chaining to call the second constructor with two parameters, passing 'value1' and '0' as arguments. The second constructor initializes the 'Value1' and 'Value2' properties.

Here's how you can use the constructors: 


MyClass obj1 = new MyClass(10);
Console.WriteLine(obj1.Value1); // Output: 10
Console.WriteLine(obj1.Value2); // Output: 0

MyClass obj2 = new MyClass(20, 30);
Console.WriteLine(obj2.Value1); // Output: 20
Console.WriteLine(obj2.Value2); // Output: 30

As shown in the example, you can create a single object and call different constructors using different parameter combinations. Constructor chaining allows you to provide flexibility in object initialization while reusing the common initialization logic.

Here's another example that demonstrates the 'MathExam' class, which includes three constructors. The first one is the default constructor that needs to be invoked. The other two constructors are parameterized constructors, and we are passing 2 and 3 parameters to them, respectively.

When we create an instance of this class by invoking the default constructor, multiple constructors will be called. 


MathExam obj = new MathExam();

Output:

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