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C# | Convert.ToDouble(String, IFormatProvider) Method

  • Last Updated : 18 Dec, 2019

This method is used to converts the specified string representation of a number to an equivalent double-precision floating-point number, using the specified culture-specific formatting information.

Syntax:

public static double ToDouble (string value, IFormatProvider provider);

Parameters:

  • value: It is a string that contains the number to convert.
  • provider: It is an object that supplies culture-specific formatting information.

Return Value: This method returns a double-precision floating-point number which is equivalent to the number in value, or 0 (zero) if value is null.



Exceptions:

  • FormatException: If the value is not a number in a valid format.
  • OverflowException: If the value represents a number that is less than MinValue or greater than MaxValue.

Below programs illustrate the use of Convert.ToDouble(String, IFormatProvider) Method:

Example 1:




// C# program to demonstrate the
// Convert.ToDouble() Method
using System;
using System.Globalization;
  
class GFG {
  
// Main Method
public static void Main()
{
    try {
  
        // Create a NumberFormatInfo object 
        // and set some of its properties.
        NumberFormatInfo provider = new NumberFormatInfo();
        provider.NumberDecimalSeparator = ", ";
        provider.NumberGroupSeparator = ".";
        provider.NumberGroupSizes = new int[] { 3 };
  
        // declaring and initializing String array
        string[] values = {"123456789", "12345.6789",
                                      "12345, 6789"};
  
        // calling get() Method
        Console.Write("Converted decimal value "
                         + "of specified strings: ");
  
        for (int j = 0; j < values.Length; j++) 
        {
            get(values[j], provider);
        }
    }
  
    catch (FormatException e)
    {
  
        Console.WriteLine("\n");
        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
  
    catch (OverflowException e)
    {
  
        Console.WriteLine("\n");
        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
}
  
// Defining get() method
public static void get(string s,
      NumberFormatInfo provider)
{
  
    // converting string to specified char
    double val = Convert.ToDouble(s, provider);
  
    // display the converted char value
    Console.Write(" {0}, ", val);
}
}
Output:
Converted decimal value of specified strings:  123456789,  123456789,  12345.6789,

Example 2: For FormatException




// C# program to demonstrate the
// Convert.ToDouble() Method
using System;
using System.Globalization;
  
class GFG {
  
// Main Method
public static void Main()
{
    try {
  
        // Create a NumberFormatInfo object 
        // and set some of its properties.
        NumberFormatInfo provider = new NumberFormatInfo();
        provider.NumberDecimalSeparator = ", ";
        provider.NumberGroupSeparator = ".";
        provider.NumberGroupSizes = new int[] { 3 };
  
        // declaring and initializing String array
        string[] values = {"123456789", "12345.6789",
                                      "12345, 6789"};
  
        // calling get() Method
        Console.Write("Converted double value"
                 + " of specified strings: ");
  
        for (int j = 0; j < values.Length; j++)
        {
  
            get(values[j], provider);
        }
  
        Console.WriteLine("\n");
        string s = "123 456, 789";
  
        Console.WriteLine("format of s is invalid ");
  
        // converting string to specified char
        double val = Convert.ToDouble(s, provider);
  
        // display the converted char value
        Console.Write(" {0}, ", val);
    }
  
    catch (FormatException e) 
    {
  
        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
      
    catch (OverflowException e) 
    {
  
        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
}
  
// Defining get() method
public static void get(string s,
      NumberFormatInfo provider)
{
  
    // converting string to specified char
    double val = Convert.ToDouble(s, provider);
  
    // display the converted char value
    Console.Write(" {0}, ", val);
}
}
Output:
Converted double value of specified strings:  123456789,  123456789,  12345.6789, 

format of s is invalid 
Exception Thrown: System.FormatException

Example 3: For OverflowException




// C# program to demonstrate the
// Convert.ToDouble() Method
using System;
using System.Globalization;
  
class GFG {
  
// Main Method
public static void Main()
{
    try {
  
        // Create a NumberFormatInfo object
        // and set some of its properties.
        NumberFormatInfo provider = new NumberFormatInfo();
        provider.NumberDecimalSeparator = ", ";
        provider.NumberGroupSeparator = ".";
        provider.NumberGroupSizes = new int[] { 3 };
  
        // declaring and initializing String array
        string[] values = { "123456789", "12345.6789",
                                      "12345, 6789" };
  
        // calling get() Method
        Console.Write("Converted decimal value "
                    + "of specified strings: ");
  
        for (int j = 0; j < values.Length; j++)
        {
  
            get(values[j], provider);
        }
  
        Console.WriteLine("\n");
        string s = "-7922816251426433759354395033500000";
  
        Console.WriteLine("s is less than the MaxValue");
  
        // converting string to specified char
        decimal val = Convert.ToDecimal(s, provider);
  
        // display the converted char value
        Console.Write(" {0}, ", val);
    }
      
    catch (FormatException e) 
    {
        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
      
    catch (OverflowException e) 
    {
        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
}
  
// Defining get() method
public static void get(string s,
      NumberFormatInfo provider)
{
  
    // converting string to specified char
    double val = Convert.ToDouble(s, provider);
  
    // display the converted char value
    Console.Write(" {0}, ", val);
}
}
Output:
Converted decimal value of specified strings:  123456789,  123456789,  12345.6789, 

s is less than the MaxValue
Exception Thrown: System.OverflowException

Reference:




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