C # Convert class Introduction

The Convert class converts a basic data type to another basic data type.

For example, the following code does not work:

1. String text = "1412 ";
2. Int id = (int) text;

We can make some modifications to the above Code to achieve our goal.

1. String text = "1412 ";
2. Int id = Convert. ToInt32 (text );
   

The following code example demonstrates some conversion methods in the Convert class, including ToInt32, ToBoolean, and ToString.

Code

             double dNumber = 23.15;

try {
// Returns 23
                int    iNumber = System.Convert.ToInt32(dNumber);
            }
catch (System.OverflowException) {
                System.Console.WriteLine(
"Overflow in double to int conversion.");
            }
// Returns True
            bool   bNumber = System.Convert.ToBoolean(dNumber);

// Returns "23.15"
            string strNumber = System.Convert.ToString(dNumber);

try {
// Returns '2'
                char chrNumber = System.Convert.ToChar(strNumber[0]);
            } 
catch (System.ArgumentNullException) {
                System.Console.WriteLine("String is null");
            }
catch (System.FormatException) {
                System.Console.WriteLine("String length is greater than 1.");
            }

// System.Console.ReadLine() returns a string and it
// must be converted.
            int newInteger = 0;
try {
                System.Console.WriteLine("Enter an integer:");
                newInteger = System.Convert.ToInt32(
                                    System.Console.ReadLine());
            }
catch (System.ArgumentNullException) {
                System.Console.WriteLine("String is null.");
            }
catch (System.FormatException) {
                System.Console.WriteLine("String does not consist of an " +
"optional sign followed by a series of digits.");
            } 
catch (System.OverflowException) {
                System.Console.WriteLine(
"Overflow in string to int conversion.");
            }

            System.Console.WriteLine("Your integer as a double is {0}",
                                     System.Convert.ToDouble(newInteger));