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);
} } |
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);
} } |
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);
} } |
Converted decimal value of specified strings: 123456789, 123456789, 12345.6789, s is less than the MaxValue Exception Thrown: System.OverflowException
Reference: