The Any method checks whether any of the element in a sequence satisfy a specific condition or not.
If any element satisfy the condition, true is returned.
Let us see an example.
int[] arr = {5, 7, 10, 12, 15, 18, 20};Now, using Any() method, we will check whether any of the element in the above array is greater than 10 or not.
arr.AsQueryable().All(val => val > 5);
If any of the element satisfies the condition, then True is returned.
Let us see the complete example.
Live Demo
using System;
using System.Linq;
class Demo {
static void Main() {
int[] arr = {5, 7, 10, 12, 15, 18, 20};
// checking if any of the array elements are greater than 10
bool res = arr.AsQueryable().Any(val => val > 10);
Console.WriteLine(res);
}
}True
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As we already know about polymorphism and method overriding in C#. C# also provides a concept to hide the methods of the base class from derived class, this concept is known as Method Hiding. It is also known as Method Shadowing. In method hiding, you can hide the implementation of the methods of a base class from the derived class using the new keyword. Or in other words, in method hiding, you can redefine the method of the base class in the derived class by using the new keyword.
Example:
using System;
public class My_Family {
public void member()
{
Console.WriteLine("Total number of family members: 3");
}
}
public class My_Member : My_Family {
public new void member()
{
Console.WriteLine("Name: Rakesh, Age: 40 \nName: Somya, "+
"Age: 39 \nName: Rohan, Age: 20 ");
}
}
class GFG {
static public void Main()
{
My_Member obj = new My_Member();
obj.member();
}
}
Output:
Name: Rakesh, Age: 40 Name: Somya, Age: 39 Name: Rohan, Age: 20
Explanation: In the above example, My_Family is the base class and My_Member is a derived class. In both the classes we have the same name method, i.e. member() method. But in the derived class, the member() method is declared with the new keyword. When this method is called, it prints the name and the age of the family members not the total number of family members. Which means when we call the member() method with the help of the derived class object, it hides the same name method present in the base class due to the presence of the new keyword.
Now we will see what will happen if we do not use the new keyword to hide the method of a base class from the derived class. As shown in the below example, when we do not use new keyword compiler will give run the code without giving an error, but it will give warning that if you want to hide a method then uses the new keyword.
Example:
using System;
public class My_Family {
public void member()
{
Console.WriteLine("Total number of family members: 3");
}
}
public class My_Member : My_Family {
public void member()
{
Console.WriteLine("Name: Rakesh, Age: 40 \nName: Somya, "+
"Age: 39 \nName: Rohan, Age: 20 ");
}
}
class GFG {
static public void Main()
{
My_Member obj = new My_Member();
obj.member();
}
}
Warning:
prog.cs(18,14): warning CS0108: `My_Member.member()’ hides inherited member `My_Family.member()’. Use the new keyword if hiding was intended
prog.cs(9,14): (Location of the symbol related to previous warning)
Output:
Name: Rakesh, Age: 40 Name: Somya, Age: 39 Name: Rohan, Age: 20
In method hiding, you can also call the hidden method of the base class in the derived class using three different ways and the ways are:
Example:
using System;
public class My_Family {
public void member()
{
Console.WriteLine("Total number of family members: 3");
}
}
public class My_Member : My_Family {
public new void member()
{
base.member();
Console.WriteLine("Name: Rakesh, Age: 40 \nName: Somya,"+
" Age: 39 \nName: Rohan, Age: 20");
}
}
class GFG {
static public void Main()
{
My_Member obj = new My_Member();
obj.member();
}
}
Output:
Total number of family members: 3 Name: Rakesh, Age: 40 Name: Somya, Age: 39 Name: Rohan, Age: 20
Example:
using System;
public class My_Family {
public void member()
{
Console.WriteLine("Total number of family members: 2");
}
}
public class My_Member : My_Family {
public new void member() {
Console.WriteLine("Name: Rakesh, Age: 40 "+
"\nName: Somya, Age: 39");
}
}
class GFG {
static public void Main()
{
My_Member obj = new My_Member();
((My_Family)obj).member();
}
}
Output:
Total number of family members: 2
Note: If you try to invoke a hidden method using below syntax,
My_Member obj = new My_Family();
Here, the compiler will give an error because the object of My_Family class cannot fulfill the duties of My_Member class.
Example:
using System;
public class My_Family {
public void member()
{
Console.WriteLine("Total number of family members: 2");
}
}
public class My_Member : My_Family {
public new void member() {
Console.WriteLine("Name: Rakesh, Age: 40 "+
"\nName: Somya, Age: 39");
}
}
class GFG {
static public void Main()
{
My_Family obj = new My_Member();
obj.member();
}
}
Output:
Total number of family members: 2
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