Decimal.ToInt64() Method in C# - GeeksforGeeks

30 Jan, 2019
This method is used to convert the value of the specified Decimal to the equivalent 64-bit signed integer. A user can also convert a Decimal value to a 64-bit integer by using the Explicit assignment operator.
Syntax: public static long ToInt64 (decimal d);
Here, the value is the decimal number which is to be converted.
Return Value: It returns a 64-bit signed integer equivalent to the specified value.
Exception: This method will give OverflowException if the specified value is less than MinValue or greater than MaxValue.
Below programs illustrate the use of the above-discussed method:
Example 1:
// C# program to demonstrate the// Decimal.ToInt64(Decimal) Methodusing System;  class GFG {      // Main Method    public static void Main()    {        try {              // Taking decimal variables            Decimal dec1 = -926534668654775808.859m;            Decimal dec2 = 4897498545.2364654M;              // using Decimal.ToInt64(Decimal) Method            // Here long means Int64            long val1 = Decimal.ToInt64(dec1);                          // using Decimal.ToInt64(Decimal) Method            // Here long means Int64            long val2 = Decimal.ToInt64(dec2);                            // Printing the Int64 value            Console.WriteLine("The Int64 value "                            + "is : {0}", val1);                                              // Printing the Int64 value            Console.WriteLine("The Int64 value "                            + "is : {0}", val2);                                  }          catch (OverflowException e)         {            Console.Write("Exception Thrown: ");            Console.Write("{0}", e.GetType(), e.Message);        }    }}
The Int64 value is : -926534668654775808
The Int64 value is : 4897498545

Example 2: For OverflowException
// C# program to demonstrate the// Decimal.ToInt64(Decimal) Methodusing System;  class GFG {      // Main Method    public static void Main()    {        try {              // Taking decimal variables            Decimal dec1 = Decimal.MinValue;                          // Taking the maximum value             // of Decimal            Decimal dec2 = Decimal.MaxValue;              // using Decimal.ToInt64(Decimal) Method            // Here long means Int64            // It will give error            long val1 = Decimal.ToInt64(dec1);                          // using Decimal.ToInt64(Decimal) Method            // Here long means Int64            // It will give error            long val2 = Decimal.ToInt64(dec2);                            // Printing the Int64 value            Console.WriteLine("The Int64 value "                            + "is : {0}", val1);                                              // Printing the Int64 value            Console.WriteLine("The Int64 value "                            + "is : {0}", val2);                                  }          catch (OverflowException e)         {            Console.Write("Exception Thrown: ");            Console.Write("{0}", e.GetType(), e.Message);        }    }}
Exception Thrown: System.OverflowException

Reference:
https://docs.microsoft.com/en-us/dotnet/api/system.decimal.toint64?view=netframework-4.7.2
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