C# | Convert.ToUInt64(String, IFormatProvider) Method - GeeksforGeeks

19 Dec, 2019
This method is used to converts the specified string representation of a number to an equivalent 64-bit unsigned integer, using the specified culture-specific formatting information.
Syntax:
public static ulong ToUInt64 (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 64-bit unsigned integer that is equivalent to the number in value, or 0 (zero) if value is null.
Exceptions:
FormatException: If the value does not consist of an optional sign followed by a sequence of digits (0 through 9).
OverflowException: If the value represents a number that is less than MinValue or greater than MaxValue.
Below programs illustrate the use of Convert.ToUInt64(String, IFormatProvider) Method:
Example 1:
// C# program to demonstrate the// Convert.ToUInt64() Methodusing System;using System.Globalization;  class GFG {  // Main Methodpublic static void Main(){    try {          // creating object of CultureInfo        CultureInfo cultures = new CultureInfo("en-US");          // declaring and initializing String array        string[] values = {"123456789012",                           "+123456789012",                    "18446744073709551615"};          // calling get() Method        Console.WriteLine("Converted ulong value"              + " from a specified string ");          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() methodpublic static void get(string s,          CultureInfo cultures){      // converting string to specified ulong    ulong val = Convert.ToUInt64(s, cultures);      // display the converted ulong value    Console.Write(" {0}, ", val);}}
Converted ulong value from a specified string 
 123456789012,  123456789012,  18446744073709551615,

Example 2: For FormatException
// C# program to demonstrate the// Convert.ToUInt64() Methodusing System;using System.Globalization;  class GFG {  // Main Methodpublic static void Main(){      try {          // creating object of CultureInfo        CultureInfo cultures = new CultureInfo("en-US");      // declaring and initializing String array        string[] values = {"123456789012",                           "+123456789012",                    "18446744073709551615"};            // calling get() Method        Console.WriteLine("Converted ulong 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 ulong        long val = Convert.ToInt64(s, cultures);          // display the converted ulong 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() methodpublic static void get(string s,           CultureInfo cultures){      // converting string to    // specified ulong value    ulong val = Convert.ToUInt64(s,                          cultures);      // display the converted    // ulong value    Console.Write(" {0}, ", val);}}
Converted ulong value of specified strings: 
 123456789012,  123456789012,  18446744073709551615, 

format of s is invalid 
Exception Thrown: System.FormatException

Example 3: For OverflowException
// C# program to demonstrate the// Convert.ToUInt64() Methodusing System;using System.Globalization;  class GFG {  // Main Methodpublic static void Main(){      try {          // creating object of CultureInfo        CultureInfo cultures = new CultureInfo("en-US");          // declaring and initializing String array        string[] values = {"123456789012",                          "+123456789012",                   "18446744073709551615"};            // calling get() Method        Console.WriteLine("Converted ulong 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 ulong        ulong val = Convert.ToUInt64(s, cultures);          // display the converted ulong 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() methodpublic static void get(string s,           CultureInfo cultures){      // converting string to    // specified ulong value    ulong val = Convert.ToUInt64(s, cultures);      // display the converted ulong value    Console.Write(" {0}, ", val);}}
Converted ulong value of specified strings: 
 123456789012,  123456789012,  18446744073709551615, 

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

Reference:
https://docs.microsoft.com/en-us/dotnet/api/system.convert.touint64?view=netframework-4.7.2#System_Convert_ToUInt64_System_String_System_IFormatProvider_
shubham_singh
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