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

This method is used to convert the specified string representation of a number to an equivalent decimal number, using the specified culture-specific formatting information.

Syntax:

public static decimal ToDecimal (string value, IFormatProvider provider);

Parameters:

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

Return Value: This method returns a decimal number that 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.ToDecimal(String, IFormatProvider) Method:
Example 1:

csharp

// C# program to demonstrate the
// Convert.ToDecimal() Method
using System;
using System.Globalization;

class GFG {

// Main Method
public static void Main()
{
    try {

        // creating object of CultureInfo
        CultureInfo cultures = new CultureInfo("en-US");

        // declaring and initializing String array
        string[] values = {"123456789", "12345.6789",
                                 "123,456,789.0123"};

        // calling get() Method
        Console.WriteLine("Converted decimal value "+
                           "of specified strings: ");

        for (int j = 0; j < values.Length; j++) {
            get(values[j], cultures);
        }
    }

    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,
           CultureInfo cultures)
{

    // converting string to specified char
    decimal val = Convert.ToDecimal(s, cultures);

    // display the converted char value
    Console.Write(" {0}, ", val);
}
}

Output:

Converted decimal value of specified strings: 
 123456789,  12345.6789,  123456789.0123, 

Example 2: For FormatException

csharp

// C# program to demonstrate the
// Convert.ToDecimal() Method
using System;
using System.Globalization;

class GFG {

// Main Method
public static void Main()
{
    try {

        // creating object of CultureInfo
        CultureInfo cultures = new CultureInfo("en-US");

        // declaring and initializing String array
        string[] values = {"123456789", "12345.6789",
                                 "123,456,789.0123"};

        // calling get() Method
        Console.WriteLine("Converted decimal value"+
                         " of specified strings: ");

        for (int j = 0; j < values.Length; j++) {

            get(values[j], cultures);
        }

        Console.WriteLine("\n");
        string s = "123 456, 789";

        Console.WriteLine("format of s is invalid ");

        // converting string to specified char
        decimal val = Convert.ToDecimal(s, cultures);

        // 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,
           CultureInfo cultures)
{

    // converting string to
    // specified decimal value
    decimal val = Convert.ToDecimal(s, cultures);

    // display the converted decimal value
    Console.Write(" {0}, ", val);
}
}

Output:

Converted decimal value of specified strings: 
 123456789,  12345.6789,  123456789.0123, 

format of s is invalid 
Exception Thrown: System.FormatException

Example 3: For OverflowException

csharp

// C# program to demonstrate the
// Convert.ToDecimal() Method
using System;
using System.Globalization;

class GFG {

// Main Method
public static void Main()
{
    try {

        // creating object of CultureInfo
        CultureInfo cultures = new CultureInfo("en-US");

        // declaring and initializing String array
        string[] values = {"123456789", "12345.6789",
                                 "123,456,789.0123"};

        // calling get() Method
        Console.WriteLine("Converted decimal value "+
                           "of specified strings: ");

        for (int j = 0; j < values.Length; j++) {

            get(values[j], cultures);
        }

        Console.WriteLine("\n");
        string s = "-7922816251426433759354395033500000";

        Console.WriteLine("s is less than the MinValue");

        // converting string to specified char
        decimal val = Convert.ToDecimal(s, cultures);

        // 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,
           CultureInfo cultures)
{

    // converting string to
    // specified decimal value
    decimal val = Convert.ToDecimal(s, cultures);

    // display the converted decimal value
    Console.Write(" {0}, ", val);
}
}

Output:

Converted decimal value of specified strings: 
 123456789,  12345.6789,  123456789.0123, 

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

Reference:

• https://docs.microsoft.com/en-us/dotnet/api/system.convert.todecimal?view=netframework-4.7.2#System_Convert_ToDecimal_System_String_System_IFormatProvider_