static void Main(string[] args)
{
int[] numbers = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
NumberPredicate evenPredicate = IsEven;
// call a method using delegate
Console.WriteLine($"Use a delegate variable: {evenPredicate(6)}");
// create an instance of the NumberPredicate delegate type using an
// implicit lambda expression
evenPredicate = number => number % 2 == 0;
// call a lambda expression through a variable
Console.WriteLine($"Use a lambda-expression variable: {evenPredicate(4)}");
// filter the even numbers using a lambda expression
List <int> evenNumbers = FilterArray(numbers, evenPredicate);
// display the result
DisplayList("Use a lambda expression to filter even numbers: ", evenNumbers);
// filter the odd numbers using an explicitly typed lambda
// expression
List <int> oddNumbers = FilterArray(numbers, (int number) => number % 2 == 1);
// display the result
DisplayList("Use a lambda expression to filter odd numbers: ", oddNumbers);
// filter numbers greater than 5 using an implicit lambda statement
List <int> numbersOver5 = FilterArray(numbers, number => { return(number > 5); });
// display the result
DisplayList("Use a lambda expression to filter numbers over 5: ", numbersOver5);
}
static void Main(string[] args)
{
int[] numbers = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
//create an instance of the NumberPredicate delegate type
NumberPredicate evenPredicate = IsEven;
//Call IsEven eusing a delegate variable
Console.WriteLine(
$"Call IsEven using a delegate variable: {evenPredicate}");
//filter the even numbers using method IsEven
List <int> evenNumbers = FilterArray(numbers, evenPredicate);
//display the result
DisplayList("Use IsEven to filter even numbers: ", evenNumbers);
//filter the odd numbers using method IsOdd
List <int> oddNumbers = FilterArray(numbers, IsOdd);
//display the result
DisplayList("Use IsOdd to filter odd numbers: ", oddNumbers);
//filter numbers greater than 5 using method IsOver5
List <int> numbersOver5 = FilterArray(numbers, IsOver5);
//display the result
DisplayList("Use IsOver5 to filter numbers over 5: ", numbersOver5);
Console.Read();
}
//Event handler for evenOddButton
private void evenOddButton_Click(object sender, RoutedEventArgs e)
{
//create an instance for the delegate
NumberPredicate evenPredicate = IsEven;
//try to parse the input into a integer
int number;
if (Int32.TryParse(numberTextBox.Text, out number))
{
if (evenPredicate(number) == true)
{
errorMessageLabel.Content = null;
evenOddLabel.Content = "Even";
}
evenPredicate = IsOdd;
if (evenPredicate(number) == true)
{
errorMessageLabel.Content = null;
evenOddLabel.Content = "Odd";
}
}
else
{
evenOddLabel.Content = null;
errorMessageLabel.Content = "Please check the value of the (2) number. Must be an integer.";
}
}
static void Main(string[] args)
{
int[] numbers = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 20, 21, 30, 32, 36, 40, 50, 60, 70, 80, 90, 100 };
// create an instance of the NumberPredicate elegate type
NumberPredicate evenPredicate = IsEven;
// Call IsEven using a delegate variable
Console.WriteLine(
$"Call IsEven using a delegate variable : {evenPredicate(4)}");
// Filter the even numbers using method IsEven
List <int> evenNumbers = FilterArray(numbers, evenPredicate);
// Display the result
DisplayList("\nUse IsEven to filter even numbers: ", evenNumbers);
// Filter the odd numbers using method IsOdd
List <int> oddNumbers = FilterArray(numbers, IsOdd);
// Display the result
DisplayList("\nUse IsOdd to filter odd numbers: ", oddNumbers);
// Filter numbers greater than 5 using method IsOver5
List <int> numbersOver5 = FilterArray(numbers, IsOver5);
// Display the result
DisplayList("\nUse IsOver5 to filter numbers over 5: ", numbersOver5);
// Filter numbers between 5 and 50
List <int> numbersBetween5and50 = FilterArray(numbers, Between5and50);
// Display the result
DisplayList("\nUse Getween5and50 to filter numbers between 5 and 50: ", numbersBetween5and50);
// Filter numbers that are a multiple of 10
List <int> numbersMultiple10 = FilterArray(numbers, IsMultiple10);
// Display the result
DisplayList("\nUse IsMultiple10 to filter numbers that are a multiple of 10: ", numbersMultiple10);
// Filter numbers that are not a multiple of 10
List <int> numbersNot10 = FilterArray(numbers, IsNotMult10);
// Display the result
DisplayList("\nUse IsNotMulti10 to filter numbers that are not a multiple of 10: ", numbersNot10);
// Filter numbers that are a multiple of 3
List <int> numbersMultiple3 = FilterArray(numbers, IsMultiple3);
// Display the result
DisplayList("\nUse IsMultiple3 to filter numbers that are a multiple of 3: ", numbersMultiple3);
// Filter numbers that are not a multiple of 3
List <int> numbersNot3 = FilterArray(numbers, IsNotMult3);
// Display the result
DisplayList("\nUse IsNotMult3 to filter numbers that are not a multiple of 3: ", numbersNot3);
} // End Main()
public static List<int> FilterArray(int[] intArray, NumberPredicate predicate)
{
//hold selected elements
List<int> result = new List<int>();
//iterate over each element in the array
foreach (int item in intArray)
{
if (predicate(item))
result.Add(item);
}
return result;
}
private List <int> FilterArray(IEnumerable <int> array, NumberPredicate predicate)
{
var result = new List <int>();
foreach (var num in array)
{
if (predicate(num))
{
result.Add(num);
}
}
return(result);
}
// select an array's elements that satisfy the predicate
private static List<int> FilterArray( int[] intArray,
NumberPredicate predicate)
{
// hold the selected elements
List< int > result = new List< int >();
// iterate over each element in the array
foreach ( int item in intArray )
{
// if the element satisfies the predicate
if ( predicate( item ) )
result.Add( item ); // add the element to the result
} // end foreach
return result; // return the result
}
//Task C start -Check for odd and even
#region Task C -check odd/Even Num
private void btnEvenOdd_Click(object sender, EventArgs e)
{
//Exception Handelling for Number input
try
{
InputValidation(txtInputNum.Text);
string txtBoxValue = txtInputNum.Text;
int inputNum = Convert.ToInt32(txtBoxValue);
NumberPredicate evenPredicate = IsEven;
lblEvenOddResult.Text = "The Number is a : ";
lblEvenOddResult.Text += evenPredicate(inputNum) ? "Even" : "Odd";
}
catch (InputException ie)
{
MessageBox.Show(ie.Message, "Input Alert");
}
}
} // End Main()
// Select an array's element that statiesfies the predicate
private static List <int> FilterArray(int[] intArray, NumberPredicate predicate)
{
// Hold the selected elements
var result = new List <int>();
// Iterate over each element in the array
foreach (var item in intArray)
{
// If the element satisfies the predicate
if (predicate(item)) // Invokes method referenced by the predicate
{
result.Add(item); // Add the element to the result
} // End if
} // End foreach
return(result); // Returns the result
} // End List<>
// select an array's elements that satisfy the predicate
private static List <int> FilterArray(int[] intArray, NumberPredicate predicate)
{
// hold the selected elements
var result = new List <int>();
// iterate over each element in the array
foreach (var item in intArray)
{
// if the element satisfies the predicate
if (predicate(item))
{
result.Add(item); // add the element to the result
}
}
return(result); // return the result
}
