Extension Methods Discoverability

Posted on February 11, 2011June 27, 2015 by coder

   
 

using System;

class Class1 {
}

class Class2 {
    public void Method1(string s) {
        Console.WriteLine("Class2.Method1");
    }
}

class Class3 {
    public void Method1(object o) {
        Console.WriteLine("Class3.Method1");
    }
}

class Class4 {
    public void Method1(int i) {
        Console.WriteLine("Class4.Method1");
    }
}

static class Extensions {
    static public void Method1(this object o, int i) {
        Console.WriteLine("Extensions.Method1");
    }

    static void Main() {
        new Class1().Method1(12); // Extensions.Method1 is called
        new Class2().Method1(12); // Extensions.Method1 is called
        new Class3().Method1(12); // Class3.Method1 is called
        new Class4().Method1(12); // Class4.Method1 is called
    }
}

Extension method for integer

Posted on February 11, 2011June 27, 2015 by coder

using System;

static class MainClass {
public static int ConvertToBase(this int i, int baseToConvertTo) {
if (baseToConvertTo < 2 || baseToConvertTo > 10)
throw new ArgumentException(“Value cannot be converted to base ” + baseToConvertTo.ToString());
int result = 0;
int iterations = 0;
do {
int nextDigit = i % baseToConvertTo;
result += nextDigit * (int)Math.Pow(10, iterations);
iterations++;
i /= baseToConvertTo;
}
while (i != 0);
return result;
}
static void Main() {
try {
int x = 591;
for (int i = 2; i <= 10; i++) { Console.WriteLine("{0} in base {1} is {2}", x, i, x.ConvertToBase(i)); } } catch (Exception ex) { Console.WriteLine("Exception: {0}", ex.Message); } } } [/csharp]

Add Extension method

Posted on February 11, 2011June 27, 2015 by coder

   
 
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Reflection;
using System.Linq;
using System.Xml;
using System.Xml.Linq;
public static class Extensions {
    public static string SpaceToUnderscore(this string source) {
        char[] cArray = source.ToCharArray();
        string result = null;

        foreach (char c in cArray) {
            if (Char.IsWhiteSpace(c))
                result += "_";
            else
                result += c;
        }

        return result;
    }
}
class Program {
    static void Main(string[] args) {
        string s = "This is a test";
        Console.WriteLine(s.SpaceToUnderscore());
    }
}

Except Prototype

Posted on February 11, 2011June 27, 2015 by coder

   
 

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;

public class MainClass {
    public static void Main() {
        string[] presidents = {"G", "H", "a", "H", "over", "Jack"};
        IEnumerable<string> processed = presidents.Take(4);
        IEnumerable<string> exceptions = presidents.Except(processed);
        foreach (string name in exceptions)
            Console.WriteLine(name);
    }
}

Use Except to print the first character of product names that aren't also the first character of customer names.

Posted on February 11, 2011June 27, 2015 by coder

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

public class MainClass {
public static void Main() {

List products = GetProductList();
List customers = GetCustomerList();

var productFirstChars =
from p in products
select p.ProductName[0];
var customerFirstChars =
from c in customers
select c.CompanyName[0];

var productOnlyFirstChars = productFirstChars.Except(customerFirstChars);

Console.WriteLine(“First letters from Product names, but not from Customer names:”);
foreach (var ch in productOnlyFirstChars) {
Console.WriteLine(ch);
}
}
static List GetProductList() {
List empTree = new List();
empTree.Add(new Product { ProductName = “A”, Category = “O”, UnitPrice = 12, UnitsInStock = 5, Total = 36, OrderDate = new DateTime(2005, 1, 1), Id = 1 });
empTree.Add(new Product { ProductName = “B”, Category = “O”, UnitPrice = 2, UnitsInStock = 4, Total = 35, OrderDate = new DateTime(2005, 1, 1), Id = 1 });
empTree.Add(new Product { ProductName = “C”, Category = “O”, UnitPrice = 112, UnitsInStock = 3, Total = 34, OrderDate = new DateTime(2005, 1, 1), Id = 1 });
empTree.Add(new Product { ProductName = “D”, Category = “O”, UnitPrice = 112, UnitsInStock = 0, Total = 33, OrderDate = new DateTime(2005, 1, 1), Id = 1 });
empTree.Add(new Product { ProductName = “E”, Category = “O”, UnitPrice = 1112, UnitsInStock = 2, Total = 32, OrderDate = new DateTime(2005, 1, 1), Id = 1 });
empTree.Add(new Product { ProductName = “F”, Category = “O”, UnitPrice = 11112, UnitsInStock = 0, Total = 31, OrderDate = new DateTime(2005, 1, 1), Id = 1 });
return empTree;
}
static List GetCustomerList() {
List empTree = new List();
empTree.Add(new Product { ProductName = “A”, Category = “O”, UnitPrice = 12, UnitsInStock = 5, Total = 36, OrderDate = new DateTime(2005, 1, 1), Id = 1 });
empTree.Add(new Product { ProductName = “B”, Category = “O”, UnitPrice = 2, UnitsInStock = 4, Total = 35, OrderDate = new DateTime(2005, 1, 1), Id = 1 });
empTree.Add(new Product { ProductName = “C”, Category = “O”, UnitPrice = 112, UnitsInStock = 3, Total = 34, OrderDate = new DateTime(2005, 1, 1), Id = 1 });
empTree.Add(new Product { ProductName = “D”, Category = “O”, UnitPrice = 112, UnitsInStock = 0, Total = 33, OrderDate = new DateTime(2005, 1, 1), Id = 1 });
empTree.Add(new Product { ProductName = “E”, Category = “O”, UnitPrice = 1112, UnitsInStock = 2, Total = 32, OrderDate = new DateTime(2005, 1, 1), Id = 1 });
empTree.Add(new Product { ProductName = “F”, Category = “O”, UnitPrice = 11112, UnitsInStock = 0, Total = 31, OrderDate = new DateTime(2005, 1, 1), Id = 1 });

List l = new List();
l.Add(new Customer { CompanyName = “A”, Region = “R1”, UnitsInStock = 1, Orders = empTree, CustomerId = 0 });
l.Add(new Customer { CompanyName = “B”, Region = “R2”, UnitsInStock = 2, Orders = empTree, CustomerId = 1 });
l.Add(new Customer { CompanyName = “C”, Region = “R3”, UnitsInStock = 3, Orders = empTree, CustomerId = 2 });
l.Add(new Customer { CompanyName = “D”, Region = “R4”, UnitsInStock = 4, Orders = empTree, CustomerId = 3 });
l.Add(new Customer { CompanyName = “E”, Region = “R5”, UnitsInStock = 5, Orders = empTree, CustomerId = 4 });
return l;
}
}
class Customer : IComparable {
public string CompanyName { get; set; }
public string Region { get; set; }
public List Orders { get; set; }
public int UnitsInStock { get; set; }
public int CustomerId { get; set; }

public override string ToString() {
return String.Format(“Id: {0}, Name: {1}, Region: {3}”, this.CustomerId, this.CompanyName, this.Region);
}
int IComparable.CompareTo(Customer other) {
if (other == null)
return 1;

if (this.CustomerId > other.CustomerId)
return 1;

if (this.CustomerId < other.CustomerId) return -1; return 0; } } class Product : IComparable {
public string ProductName { get; set; }
public string Category { get; set; }
public int UnitPrice { get; set; }
public int UnitsInStock { get; set; }
public int Total { get; set; }
public DateTime OrderDate { get; set; }
public int Id { get; set; }

public override string ToString() {
return String.Format(“Id: {0}, Name: {1} , Category: {3}”, this.Id, this.ProductName, this.Category);
}
int IComparable.CompareTo(Product other) {
if (other == null)
return 1;
if (this.Id > other.Id)
return 1;

if (this.Id < other.Id) return -1; return 0; } } [/csharp]

Use Except to print numbers that are in one integer array, but not another

Posted on February 11, 2011June 27, 2015 by coder

   
 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

public class MainClass {
    public static void Main() {
        int[] numbersA = { 0, 2, 4, 5, 6, 8, 9 };
        int[] numbersB = { 1, 3, 5, 7, 8 };

        IEnumerable<int> aOnlyNumbers = numbersA.Except(numbersB);

        Console.WriteLine("Numbers in first array but not second array:");
        foreach (var n in aOnlyNumbers) {
            Console.WriteLine(n);
        }
    }
}

One array expect another array

Posted on February 11, 2011June 27, 2015 by coder

   
 
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;

public class MainClass{
   public static void Main(){
            int[] numbers = {1, 2, 3, 4};
            int[] numbers2 = {1, 1, 3, 3};
            Console.Write(numbers.Except(numbers2));
   }
}

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