C# | Convert.ToDouble(String, IFormatProvider) Method
Last Updated :
11 Jul, 2025
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:
csharp
// 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
csharp
// 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
csharp
// 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:
