C#二进制字节数组操作函数 截取字节数组SubByte

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C#二进制字节数组操作函数 截取字节数组SubByte

 ///
 /// 截取字节数组
 ///
 /// 要截取的字节数组
 /// 开始截取位置的索引
 /// 要截取的字节长度
 /// 截取后的字节数组
 public byte[] SubByte(byte[] srcBytes, int startIndex, int length)
 {
     System.IO.MemoryStream bufferStream = new System.IO.MemoryStream();
     byte[] returnByte = new byte[] { };
     if (srcBytes == null) { return returnByte; }
     if (startIndex < 0) { startIndex = 0; }
     if (startIndex < srcBytes.Length)
     {
         if (length < 1 || length > srcBytes.Length - startIndex) { length = srcBytes.Length - startIndex; }
         bufferStream.Write(srcBytes, startIndex, length);
         returnByte = bufferStream.ToArray();
         bufferStream.SetLength(0);
         bufferStream.Position = 0;
     }
     bufferStream.Close();
     bufferStream.Dispose();
     return returnByte;
 }