C# | BitConverter。ToInt64()方法

原文:https://www . geesforgeks . org/c-sharp-bit converter-to int 64-method/

此方法用于返回从字节数组中指定位置的八个字节转换而来的 64 位有符号整数。 语法:

public static long ToInt64 (byte[] value, int startIndex);

参数:

值:是字节数组。 起始指数:内的起始位置。

返回值:该方法返回一个 64 位有符号整数,由从开始的两个字节组成例外:

  • 参数异常:如果起始索引大于或等于值减 7 的长度,并且小于或等于的长度减 1。
  • 参数空异常:如果为空。
  • argumentout of range exception:如果开始索引小于零或者大于的长度减 1。

以下程序说明了位转换器的使用。【方法: 例 1:****

c sharp . c sharp . c sharp . c sharp

// C# program to demonstrate
// BitConverter.ToInt64(Byte[], Int32);
// Method
using System;

public class GFG {

    // Main Method
    public static void Main()
    {

        try {

            // Define an array of byte values.
            byte[] bytes = {32, 0, 0, 42, 0,
                            65, 0, 125, 0, 197,
                            0, 168, 3, 41, 4,
                                     125, 32};

            // Display the values of the myArr.
            Console.Write("Initial Array: ");

            // calling the PrintIndexAndValues()
            // method to print
            PrintIndexAndValues(bytes);

            // print char value
            Console.WriteLine("index       byte Array"+                   
             "                            long value");

            for (int index = 0; index < bytes.Length - 7;
                                     index = index + 8) {

                long values = BitConverter.ToInt64(bytes, index);

                Console.WriteLine(" {0}     {1}         {2}",
                       index, BitConverter.ToString(bytes,
                                       index, 8), values);
            }
        }
        catch (ArgumentNullException e) {

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (ArgumentOutOfRangeException e) {

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (ArgumentException e) {

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }

    // Defining the method
    // PrintIndexAndValues
    public static void PrintIndexAndValues(byte[] myArr)
    {
        for (int i = 0; i < myArr.Length; i++) {

            Console.Write("{0} ", myArr[i]);
        }

        Console.WriteLine();
        Console.WriteLine();
    }
}

Output: 

Initial Array: 32 0 0 42 0 65 0 125 0 197 0 168 3 41 4 125 32 

index       byte Array                            long value
 0     20-00-00-2A-00-41-00-7D         9007270723701440544
 8     00-C5-00-A8-03-29-04-7D         9008370250328098048

例 2:议论文异常

c sharp . c sharp . c sharp . c sharp

// C# program to demonstrate
// BitConverter.ToInt64(Byte[], Int32);
// Method
using System;

public class GFG {

    // Main Method
    public static void Main()
    {

        try {

            // Define an array of byte values.
        byte[] bytes = {32, 0, 0, 42, 0, 65,
                        0, 125, 0, 197, 0,
                        168, 3, 41, 4, 125};

            // Display the values of the myArr.
            Console.Write("Initial Array: ");

            // calling the PrintIndexAndValues()
            // method to print
            PrintIndexAndValues(bytes);

            // print char value
            Console.WriteLine("index       element"+                   
             "                        float value");

            for (int index = 1; index < bytes.Length - 6;
                                     index = index + 8) {

                if (index == bytes.Length - 7) {

                    Console.WriteLine();
                    Console.WriteLine("startindex is {0} which is equals"+
                               " to the length of Array minus 7.", index);

                    long values = BitConverter.ToInt64(bytes, index);

                    Console.WriteLine(" {0}     {1}         {2}", index,
                                         BitConverter.ToString(bytes,
                                                  index, 8), values);
                }
                else {
                    long values = BitConverter.ToInt64(bytes, index);
                    Console.WriteLine(" {0}     {1}         {2}",
                           index, BitConverter.ToString(bytes,
                                           index, 8), values);
                }
            }
        }
        catch (ArgumentNullException e) {

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (ArgumentOutOfRangeException e) {

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (ArgumentException e) {

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }

    // Defining the method
    // PrintIndexAndValues
    public static void PrintIndexAndValues(byte[] myArr)
    {
        for (int i = 0; i < myArr.Length; i++) {

            Console.Write("{0} ", myArr[i]);
        }

        Console.WriteLine();
        Console.WriteLine();
        Console.WriteLine("initial Array in string: {0} ",
                           BitConverter.ToString(myArr));
        Console.WriteLine();
    }
}

Output

Initial Array: 32 0 0 42 0 65 0 125 0 197 0 168 3 41 4 125 

initial Array in string: 20-00-00-2A-00-41-00-7D-00-C5-00-A8-03-29-04-7D 

index       element                        float value
 1     00-00-2A-00-41-00-7D-00         35184651264458752

startindex is 9 which is equals to the length of Array minus 7.
Exception Thrown: System.ArgumentException

例 3:argumentout of rangeexception

c sharp . c sharp . c sharp . c sharp

// C# program to demonstrate
// BitConverter.ToInt64(Byte[], Int32);
// Method
using System;

public class GFG {

    // Main Method
    public static void Main()
    {

        try {

            // Define an array of byte values.
            byte[] bytes = {32, 0, 0, 42, 0, 65,
                            0, 125, 0, 197, 0,
                            168, 3, 41, 4, 125};

            // Display the values of the myArr.
            Console.Write("Initial Array: ");

            // calling the PrintIndexAndValues()
            // method to print
            PrintIndexAndValues(bytes);

            // print char value
            Console.WriteLine("index         element"+
                     "                  float value");

            for (int index = 0; index < bytes.Length + 1;
                                    index = index + 8) {

                if (index == bytes.Length) {

                    Console.WriteLine();
                    Console.WriteLine("startindex is {0} which is greater"+
                               " than the Length of array minus 1", index);

                    long values = BitConverter.ToInt64(bytes, index);

                    Console.WriteLine(" {0}     {1}         {2}", index,
                                         BitConverter.ToString(bytes,
                                                  index, 8), values);
                }
                else {
                    long values = BitConverter.ToInt64(bytes, index);
                    Console.WriteLine(" {0}     {1}         {2}",
                           index, BitConverter.ToString(bytes,
                                           index, 8), values);
                }
            }
        }
        catch (ArgumentNullException e) {

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (ArgumentOutOfRangeException e) {

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (ArgumentException e) {

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }

    // Defining the method
    // PrintIndexAndValues
    public static void PrintIndexAndValues(byte[] myArr)
    {
        for (int i = 0; i < myArr.Length; i++) {

            Console.Write("{0} ", myArr[i]);
        }

        Console.WriteLine();
        Console.WriteLine();
        Console.WriteLine("Initial Array in string: {0} ",
                           BitConverter.ToString(myArr));
        Console.WriteLine();
    }
}

Output

Initial Array: 32 0 0 42 0 65 0 125 0 197 0 168 3 41 4 125 

Initial Array in string: 20-00-00-2A-00-41-00-7D-00-C5-00-A8-03-29-04-7D 

index         element                  float value
 0     20-00-00-2A-00-41-00-7D         9007270723701440544
 8     00-C5-00-A8-03-29-04-7D         9008370250328098048

startindex is 16 which is greater than the Length of array minus 1
Exception Thrown: System.ArgumentOutOfRangeException

例 4:ArgumentNullException

c sharp . c sharp . c sharp . c sharp

// C# program to demonstrate
// BitConverter.ToInt64(Byte[], Int32);
// Method
using System;

public class GFG {

    // Main Method
    public static void Main()
    {

        try {

            // Define an array of byte values.
            byte[] bytes = null;

            // get the long value

            long values = BitConverter.ToInt64(bytes, 0);
            Console.Write("{0}", values);
        }
        catch (ArgumentNullException e) {

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (ArgumentOutOfRangeException e) {

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (ArgumentException e) {

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}

Output: 

Exception Thrown: System.ArgumentNullException

参考: