CSharp

CSharp – Conversions

Type conversion is basically converting one type of data to another type.

Example:

using System;
using System.Collections;

namespace ConsoleApplication1
{
    class StringConversion
    {
        static void Main(string[] args)
        {
            int i = 75;
            float f = 53.005f;
            double d = 2345.7652;
            bool b = true;

            Console.WriteLine(i.ToString());
            Console.WriteLine(f.ToString());
            Console.WriteLine(d.ToString());
            Console.WriteLine(b.ToString());
            Console.ReadKey();

        }
    }
}

The result is:

75
53.005
2345.7652
True

Conversion Methods:

ToBoolean()
Converts a type to a Boolean value, where possible.

ToByte()
Converts a type to a byte.

ToChar()
Converts a type to a single Unicode character, where possible.

ToDateTime()
Converts a type (integer or string type) to date-time structures.

ToDecimal()
Converts a floating point or integer type to a decimal type.

ToDouble()
Converts a type to a double type.

ToInt16()
Converts a type to a 16-bit integer.

ToInt32()
Converts a type to a 32-bit integer.

ToInt64()
Converts a type to a 64-bit integer.

ToSbyte()
Converts a type to a signed byte type.

ToSingle()
Converts a type to a small floating point number.

ToString()
Converts a type to a string.

ToType()
Converts a type to a specified type.

ToUInt16()
Converts a type to an unsigned int type.

ToUInt32()
Converts a type to an unsigned long type.

ToUInt64()
Converts a type to an unsigned big integer.

My Official Website: http://www.lucedigitale.com

Ref: http://www.tutorialspoint.com/csharp/csharp_type_conversion.htm

CSharp – Strings

In C#, you can use strings as:
– string keyword to declare a string variable (alias for the System.String class)
– array of characters

How you can use string

using System;
using System.Collections;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            //from string literal and string concatenation
            string fname, lname;
            fname = "Rowan";
            lname = "Atkinson";

            string fullname = fname + lname;
            Console.WriteLine("Full Name: {0}", fullname);

            //by using string constructor
            char[] letters = { 'H', 'e', 'l', 'l', 'o' };
            string greetings = new string(letters);
            Console.WriteLine("Greetings: {0}", greetings);

            //methods returning string
            string[] sarray = { "Hello", "From", "Tutorials", "Point" };
            string message = String.Join(" ", sarray);
            Console.WriteLine("Message: {0}", message);

            //formatting method to convert a value 
            DateTime waiting = new DateTime(2012, 10, 10, 17, 58, 1);
            string chat = String.Format("Message sent at {0:t} on {0:D}",
            waiting);
            Console.WriteLine("Message: {0}", chat);
            Console.ReadKey();
        }
    }
}

The result is:

Full Name: Rowan Atkinson
Greetings: Hello
Message: Hello From Tutorials Point
Message: Message sent at 5:58 PM on Wednesday, October 10, 2012

Comparing Strings

using System;
using System.Collections;

namespace ConsoleApplication1
{
    class StringProg
    {
        static void Main(string[] args)
        {
            string str1 = "This is test";
            string str2 = "This is text";

            if (String.Compare(str1, str2) == 0)
            {
                Console.WriteLine(str1 + " and " + str2 + " are equal.");
            }
            else
            {
                Console.WriteLine(str1 + " and " + str2 + " are not equal.");
            }
            Console.ReadKey();
        }
    }
}

The result is:

This is test and This is text are not equal.

Detect a string

using System;

namespace ConsoleApplication1
{
    class StringProg
    {
        static void Main(string[] args)
        {
            string str = "This is test";
            if (str.Contains("test"))
            {
                Console.WriteLine("The sequence 'test' was found.");
            }
            Console.ReadKey();
        }
    }
}

The result is:

The sequence ‘test’ was found.

Get a substring

using System;

namespace StringApplication
{
   class StringProg
   {
      static void Main(string[] args)
      {
         string str = "Last night I dreamt of San Pedro";
         Console.WriteLine(str);
         string substr = str.Substring(23); // from 24th character to the end
         Console.WriteLine(substr);
      }
      Console.ReadKey() ;
   }
}

The result is:

San Pedro

Joining Strings

using System;

namespace StringApplication
{
   class StringProg
   {
      static void Main(string[] args)
      {
         string[] starray = new string[]{"Down the way nights are dark",
         "And the sun shines daily on the mountain top",
         "I took a trip on a sailing ship",
         "And when I reached Jamaica",
         "I made a stop"};

         string str = String.Join("\n", starray);
         Console.WriteLine(str);
      }
      Console.ReadKey() ;
   }
}

The result is:

Down the way nights are dark
And the sun shines daily on the mountain top
I took a trip on a sailing ship
And when I reached Jamaica
I made a stop

My website: http://www.lucedigitale.com

Ref: http://www.tutorialspoint.com/csharp/csharp_strings.htm