C# | Double.ToString() Method | Set – 1

29 Mar, 2019
Double.ToString() Method is used to convert the numeric value of the current instance to its equivalent string representation. There are 4 methods in the overload list of this method as follows:
ToString(String) Method
ToString() Method
ToString(IFormatProvider) Method
ToString(String, IFormatProvider) Method
Here, we will discuss the first two methods.
This method is used to convert the numeric value of the current instance to its equivalent string representation, using the specified format.
Syntax: public string ToString (string format);Here, it takes a numeric format string.
Return Value: This method returns the string representation of the value of the current instance as specified by format.
Exceptions: This method throws FormatException if format is invalid.
Example 1:
// C# program to demonstrate the// Double.ToString(String) Methodusing System;  class GFG {      // Main Method    public static void Main()    {        try {              // Declaring and initializing value            double value = 16325.62d;              // Declaring and initializing format            string s = "E04";              // using the method            string str = value.ToString(s);              // Display the value            Console.WriteLine("String value is {0}", str);        }          catch (FormatException e)         {            Console.WriteLine("Format is invalid.");            Console.Write("Exception Thrown: ");            Console.Write("{0}", e.GetType(), e.Message);        }    }}
String value is 1.6326E+004

Example 2: For FormatException
// C# program to demonstrate the// Double.ToString(String) Methodusing System;  class GFG {      // Main Method    public static void Main()    {        try {              // Declaring and initializing value            double value = 16325.62d;              // Declaring and initializing format            string s = "a";              // using the method            string str = value.ToString(s);              // Display the value            Console.WriteLine("String value is {0}", str);        }          catch (FormatException e)         {            Console.WriteLine("Format is invalid.");            Console.Write("Exception Thrown: ");            Console.Write("{0}", e.GetType(), e.Message);        }    }}
Format is invalid.
Exception Thrown: System.FormatException

This method is used to convert the numeric value of the current instance to its equivalent string representation.
Syntax: public override string ToString ();
Return Value: This method returns a string which represents the value of this instance.
Below programs illustrate the use of Double.ToString() Method:
Example 1:
// C# program to demonstrate the// Double.ToString()  Methodusing System;  class GFG {      // Main Method    public static void Main()    {          // Declaring and initializing value        double value = 7922816251426433759354.39503305d;          // using ToString() method        string round = value.ToString();          // Display the value        Console.WriteLine("String value is {0}", round);    }}
String value is 7.92281625142643E+21

Example 2:
// C# program to demonstrate the// Double.ToString() Methodusing System;using System.Globalization;  class GFG {      // Main Method    public static void Main()    {          // calling get() method        get(20.3495d);        get(30.5945994d);        get(40d);        get(4294967295.5858d);    }      // defining get() method    public static void get(double value)    {          // using ToString() method        string round = value.ToString();          // Display the value        Console.WriteLine("String value is {0}", round);    }}
String value is 20.3495
String value is 30.5945994
String value is 40
String value is 4294967295.5858

Reference:
https://docs.microsoft.com/en-us/dotnet/api/system.double.tostring?view=netframework-4.7.2
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