Month: February 2011

Use AddFirst to add an element to xml document

Posted on by coder
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using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.Linq;
using System.Reflection;
using System.Xml.Linq;

class Program {
    static void Main(string[] args) {
        XElement xml = XElement.Load("Employee.xml");
        xml.AddFirst(new XElement("person",
                        new XElement("id", 5),
                        new XElement("firstname", "Tom"),
                        new XElement("lastname", "Cruise"),
                        new XElement("idrole", 1)));
        Console.WriteLine(xml);
    }
}

Adding a Node in a Specific Location of the Specified Node's Child Nodes with AddAfterSelf

Posted on by coder
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using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Xml;
using System.Xml.Linq;
public class MainClass {
    public static void Main() {
        XDocument xDocument = new XDocument(
          new XElement("Books",
            new XElement("Book",
              new XAttribute("type", "Author"),
              new XElement("FirstName", "J"),
              new XElement("LastName", "R"))));

        xDocument.Element("Books").Add(
          new XElement("Book",
            new XAttribute("type", "Author"),
            new XElement("FirstName", "E"),
            new XElement("LastName", "B")));

        xDocument.Element("Books").
          Element("Book").AddAfterSelf(
            new XElement("Book",
              new XAttribute("type", "Reviewer"),
              new XElement("FirstName", "F"),
              new XElement("LastName", "F")));

        Console.WriteLine(xDocument);
    }
}

Adding a Node in the Specified Node's Child Nodes with AddBeforeSelf

Posted on by coder
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using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Xml;
using System.Xml.Linq;
public class MainClass {
    public static void Main() {
        XDocument xDocument = new XDocument(
          new XElement("Books",
            new XElement("Book",
              new XAttribute("type", "Author"),
              new XElement("FirstName", "A"),
              new XElement("LastName", "B"))));
        xDocument.Element("Books").Add(
          new XElement("Book",
            new XAttribute("type", "Author"),
            new XElement("FirstName", "E"),
            new XElement("LastName", "B")));

        xDocument.Element("Books").
          Elements("Book").
          Where(e => ((string)e.Element("FirstName")) == "E").
          Single<XElement>().AddBeforeSelf(
            new XElement("Book",
              new XAttribute("type", "Reviewer"),
              new XElement("FirstName", "F"),
              new XElement("LastName", "F")));
        Console.WriteLine(xDocument);
    }
}

Filter string by its length

Posted on by coder
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using System;
using System.Collections.Generic;
using System.Linq;

class LinqDemo {
    static void Main() {
        string[] names = { "Tom", "Dick", "Harry" };


        IEnumerable<string> filteredNames = names.Where(n => n.Length >= 4);
        foreach (string name in filteredNames) Console.Write(name + "|");
    }
}

Assign the loop variable to another variable declared inside the statement block

Posted on by coder
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using System;
using System.Collections.Generic;
using System.Linq;
public class MainClass {
    public static void Main() {
        IEnumerable<char> vowels = "aeiou";
        IEnumerator<char> rator = vowels.GetEnumerator();
        IEnumerable<char> query = "Not what you might expect";


        foreach (char vowel in "aeiou") {

            char temp = vowel;
            query = query.Where(c => c != temp);
        }
    }
}

use where clause in a while loop

Posted on by coder
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using System;
using System.Collections.Generic;
using System.Linq;
public class MainClass {
    public static void Main() {

        IEnumerable<char> vowels = "aeiou";
        IEnumerator<char> rator = vowels.GetEnumerator();
        IEnumerable<char> query = "Not what you might expect";

        char vowel;
        while (rator.MoveNext()) {
            vowel = rator.Current;
            query = query.Where(c => c != vowel);
        }
    }
}

Two where clauses

Posted on by coder
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using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;

class Employee {
    int _id;
    int _idRole;
    string _lastName;
    string _firstName;

    public int ID {
        get { return _id; }
        set { _id = value; }
    }

    public int IDRole {
        get { return _idRole; }
        set { _idRole = value; }
    }

    public string LastName {
        get { return _lastName; }
        set { _lastName = value; }
    }

    public string FirstName {
        get { return _firstName; }
        set { _firstName = value; }
    }
}
class Salary {
    int _id;
    int _year;
    double _salary;

    public int ID {
        get { return _id; }
        set { _id = value; }
    }

    public int Year {
        get { return _year; }
        set { _year = value; }
    }

    public double SalaryPaid {
        get { return _salary; }
        set { _salary = value; }
    }
}
public class MainClass {
    public static void Main() {
        List<Employee> people = new List<Employee> {
              new Employee  { ID = 1, IDRole = 1, LastName = "A", FirstName = "B"},
              new Employee  { ID = 2, IDRole = 2, LastName = "G", FirstName = "T"}
            };
        List<Salary> salaries = new List<Salary> {
               new Salary { ID = 1, Year = 2004, SalaryPaid = 10000.00 },
               new Salary { ID = 1, Year = 2005, SalaryPaid = 15000.00 },
               new Salary { ID = 1, Year = 2005, SalaryPaid = 15000.00 }
            };
        IEnumerable<Salary> q = from p in people
                                where p.ID == 1
                                from s in salaries
                                where s.ID == p.ID
                                select s;


    }
}