C# | BitConverter。图注 64 方法

原文:https://www . geesforgeks . org/c-sharp-bit converter-touint 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 位无符号整数。

语法:

public static ulong ToUInt64 (byte[] value, int startIndex);

参数:

值:是字节数组。起始指数:是值内的起始位置。

返回值:该方法返回一个 64 位无符号整数，由从开始索引的八个字节组成。

异常:

参数异常:如果起始索引大于等于值的长度减 7，小于等于值的长度减 1。
ArgumentNullException: 如果值为空。
argumentout of range exception:如果开始索引小于零或者大于值的长度减 1。

以下程序说明了位转换器的使用。图注 64 方法:

例 1:

// C# program to demonstrate
// BitConverter.ToUInt64(Byte[], Int32);
// Method
using System;

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"+
                          "             ulong value");

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

            ulong values = BitConverter.ToUInt64(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             ulong value
 0     20-00-00-2A-00-41-00-7D     9007270723701440544
 8     00-C5-00-A8-03-29-04-7D     9008370250328098048

示例 2: 适用于参数异常

// C# program to demonstrate
// BitConverter.ToUInt64(Byte[], Int32);
// Method
using System;

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           element"+
                    "                 ulong 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);

                ulong values = BitConverter.ToUInt64(bytes, index);

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

            else {
                ulong values = BitConverter.ToUInt64(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("intial 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 32 

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

index           element                 ulong value
  0      20-00-00-2A-00-41-00-7D      9007270723701440544
  8      00-C5-00-A8-03-29-04-7D      9008370250328098048
Exception Thrown: System.ArgumentException

示例 3: 适用于参数异常

// C# program to demonstrate
// BitConverter.ToUInt64(Byte[], Int32);
// Method
using System;

class GFG {

    // Main Method
    public static void Main()
    {

        try {

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

            // get the long value

            ulong values = BitConverter.ToUInt64(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:

https://docs . Microsoft . com/en-us/dotnet/API/system . bit converter . touint 64？视图=netframework-4.7.2

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