C＃| BitConverter.DoubleToInt64Bits()方法

BitConverter.DoubleToInt64Bits(Double)方法用于将指定的双精度浮点数转换为64位带符号整数。

句法：

public static long DoubleToInt64Bits (double value);

在此，该值是要转换的数字。

返回值：该方法返回一个64位带符号整数，其值等于value 。

下面的程序说明了BitConverter.DoubleToInt64Bits(Double)方法的用法：

范例1：

// C# program to demonstrate
// BitConverter.DoubleToInt64Bits()
// Method
using System;
  
public class GFG {
  
    // Main Method
    public static void Main()
    {
  
        // declaring and initializing double value
        double value = 1.2345678901234565;
  
        // Display the double value
        Console.Write("double-precision floating point: ");
        Console.WriteLine("{0}", value);
        Console.WriteLine();
  
        // Converting double to long value
        // using BitConverter.DoubleToInt64Bits()
        // Method
        long value1 = BitConverter.DoubleToInt64Bits(value);
  
        // Display the 64-bit signed integer.
        Console.Write("64-bit signed integer: ");
        Console.WriteLine("{0}", value1);
    }
}

输出：

double-precision floating point: 1.23456789012346

64-bit signed integer: 4608238818662570490

范例2：

// C# program to demonstrate
// BitConverter.DoubleToInt64Bits()
// Method
using System;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
  
        // declaring and initializing double value
        double value = 1.0;
  
        // Display the double value
        Console.Write("double-precision floating point: ");
        Console.WriteLine("{0}", value);
        Console.WriteLine();
  
        // Converting double to long value
        // using BitConverter.DoubleToInt64Bits()
        // Method
        long value1 = BitConverter.DoubleToInt64Bits(value);
  
        // Display the 64-bit signed integer.
        Console.Write("64-bit signed integer: ");
        Console.WriteLine("{0}", value1);
        Console.WriteLine();
  
        // Display the Hexadecimal value
        Console.Write("Hexadecimal value: ");
        Console.WriteLine(value1.ToString("X"));
    }
}

输出：

double-precision floating point: 1

64-bit signed integer: 4607182418800017408

Hexadecimal value: 3FF0000000000000

参考：

• https://docs.microsoft.com/zh-cn/dotnet/api/system.bitconverter.doubletoint64bits?view=netframework-4.7.2