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byte[] 之初始化赋值 用for loop 赋值当然是最基本的方法,不过在C#里面还有其他的便捷方法。 1. 创建一个长度为10的byte数组,并且其中每个byte的值为0. byte[] myByteArray = new byte[10]; C# 在创建数值型(int, byte)数组时,会自动的把数组中的每个元素赋值为0. (注:如果是string[], 则每个元素为的值为null.
2. 创建一个长度为10的byte数组,并且其中每个byte的值为0x08. byte[] myByteArray = Enumerable.Repeat((byte)0x08, 10).ToArray(); 用linq来赋值,语句只要一条, 当然我们还可以赋值不同的,但是有一定规律的值。 byte[] res= Enumerable.Range(1, 1000).Select(c=>Convert.ToByte(c)).ToArray();
3. 直接赋值 byte[] myByteArray = new byte[] { 0x01, 0x02, 0x03 };
byte[] ---> ushort byte[] array = new byte[] { 0xFE, 0x00 }; ushort register = BitConverter.ToUInt16(array, 0); 上述转换后register 的值为 0x00FE byte[] array = new byte[] { 0x02, 0x01 ,0x04, 0x03 }; ushort register = BitConverter.ToUInt16(array, 0); 上述转化后,其实只是取了array[0], array[1].的值,最后register 的值是 0x00010002, 即258 byte[] -> string public static string ByteArrayToString(byte[] ba) { string hex = BitConverter.ToString(ba); return hex.Replace("-",""); }
ushort ---> byte[] ushort register = 0x00F0; byte[] arr = BitConverter.GetBytes(register); 在PC系统里, arr[0] = 0xF0(地位), arr[1] = 0x00 . 互换ushort中的两个字节 ushort number = 0x00F0; byte[] temp = BitConverter.GetBytes(number); Array.Reverse(temp); ushort a = BitConverter.ToUInt16(temp, 0); ushort b = (ushort)(number << 8 | ((number & 0xFF00) >> 8)); byte[] => Struct public StructType ConverBytesToStructure<StructType>(byte[] bytesBuffer) { // 检查长度。 if (bytesBuffer.Length != Marshal.SizeOf(typeof(StructType))) { throw new ArgumentException("bytesBuffer参数和structObject参数字节长度不一致。"); } IntPtr bufferHandler = Marshal.AllocHGlobal(bytesBuffer.Length); for (int index = 0; index < bytesBuffer.Length; index++) { Marshal.WriteByte(bufferHandler, index, bytesBuffer[index]); } StructType structObject = (StructType)Marshal.PtrToStructure(bufferHandler, typeof(StructType)); Marshal.FreeHGlobal(bufferHandler); return structObject; } 代码 /// <summary> /// 将byte[]还原为指定的struct,该函数的泛型仅用于自定义结构 /// startIndex:数组中 Copy 开始位置的从零开始的索引。 /// length:要复制的数组元素的数目。 /// </summary> public static T BytesToStruct<T>(byte[] bytes, int startIndex, int length) { if (bytes == null) return default(T); if (bytes.Length <= 0) return default(T); IntPtr buffer = Marshal.AllocHGlobal(length); try//struct_bytes转换 { Marshal.Copy(bytes, startIndex, buffer, length); return (T)Marshal.PtrToStructure(buffer, typeof(T)); } catch(Exception ex) { throw new Exception("Error in BytesToStruct ! " + ex.Message); } finally { Marshal.FreeHGlobal(buffer); } } Struct => byte[] 代码 /// <summary> /// 将struct类型转换为byte[] /// </summary> public static byte[] StructToBytes(object structObj, int size) { IntPtr buffer = Marshal.AllocHGlobal(size); try//struct_bytes转换 { Marshal.StructureToPtr(structObj, buffer, false); byte[] bytes = new byte[size]; Marshal.Copy(buffer, bytes, 0, size); return bytes; } catch (Exception ex) { throw new Exception("Error in StructToBytes ! " + ex.Message); } finally { Marshal.FreeHGlobal(buffer); } }
byte[] 数组比较 //You can use Enumerable.SequenceEqual method. using System; using System.Linq; ... var a1 = new int[] { 1, 2, 3}; var a2 = new int[] { 1, 2, 3}; var a3 = new int[] { 1, 2, 4}; var x = a1.SequenceEqual(a2); // true var y = a1.SequenceEqual(a3); // false
参考: http://www.dotnetperls.com/initialize-array
转自:http://www.cnblogs.com/fdyang/archive/2013/10/20/3378974.html |
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