Monday, 10 April 2017

C# - Type Conversion

Type conversion is converting one type of data to another type. It is also known as Type Casting. In C#, type casting has two forms:
  • Implicit type conversion - These conversions are performed by C# in a type-safe manner. For example, are conversions from smaller to larger integral types and conversions from derived classes to base classes.
  • Explicit type conversion - These conversions are done explicitly by users using the pre-defined functions. Explicit conversions require a cast operator.
The following example shows an explicit type conversion:
using System;
namespace TypeConversionApplication 
{
   class ExplicitConversion 
   {
      static void Main(string[] args) 
      {
         double d = 5673.74; 
         int i;
         
         // cast double to int.
         i = (int)d;
         Console.WriteLine(i);
         Console.ReadKey();
      }
   }
}
When the above code is compiled and executed, it produces the following result:
5673

C# Type Conversion Methods

C# provides the following built-in type conversion methods:
Sr.NoMethods & Description
1ToBoolean
Converts a type to a Boolean value, where possible.
2ToByte
Converts a type to a byte.
3ToChar
Converts a type to a single Unicode character, where possible.
4ToDateTime
Converts a type (integer or string type) to date-time structures.
5ToDecimal
Converts a floating point or integer type to a decimal type.
6ToDouble
Converts a type to a double type.
7ToInt16
Converts a type to a 16-bit integer.
8ToInt32
Converts a type to a 32-bit integer.
9ToInt64
Converts a type to a 64-bit integer.
10ToSbyte
Converts a type to a signed byte type.
11ToSingle
Converts a type to a small floating point number.
12ToString
Converts a type to a string.
13ToType
Converts a type to a specified type.
14ToUInt16
Converts a type to an unsigned int type.
15ToUInt32
Converts a type to an unsigned long type.
16ToUInt64
Converts a type to an unsigned big integer.
The following example converts various value types to string type:
using System;
namespace TypeConversionApplication 
{
   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();
            
      }
   }
}
When the above code is compiled and executed, it produces the following result:
75
53.005
2345.7652
True

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