A hypothetical study of C # encoding.unicode.getbytes/encoding.unicode.getstring function

Many of us know encoding.unicode this stuff, It is a Unicode byte stream used to get a string that includes converting Unicode bytes to a generic string on. NET, but there are a lot of people who don't know how it's done inside, and I was through MultiByteToWideChar

Implemented with WideCharToMultiByte , but I don't know how to implement it internally.

First we need to understand how the Unicode string is stored in memory, and Unicode specifies that a character takes two bytes and the length of the wchar_t is the same

Why should I mention this because if you don't know how long it's hard for you to write code down unless you CTRL + C && CTRL + V

In memory a string is assumed to be "medium" it corresponds to a short int value of 20013 then in memory it will be stored like this

X

low:0010 1101

HIGH:0100 1110

√

low:1011 0100

high:0111 0010

The left side is low and the right side is high. A high is a power of low, a byte has 8/bit Binary

form:1111 1111 if calculated as a decimal medium range in 0~255 and 256 times

So what we can get from the above Formula : (Low * 0) + (high * ^ 1)

Example code:

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        private void Form1_Load (object sender, EventArgs e) {byte[] Bfx = getuniocdebytes ("China");            byte[] Bfy = Encoding.Unicode.GetBytes ("China");        String str = getunicodestring (BFX);            } private byte[] Getuniocdebytes (string str) {int size = 0; if (str! = NULL && (size = str).                Length) > 0) {byte[] buffer = new byte[size * 2];                    for (int i = 0; i < size; i++) {char chr = str[i];                    Buffer[i * 2] = (byte) (CHR & 0xff);                Buffer[i * 2 + 1] = (byte) (CHR >> 8);            } return buffer;        } return new Byte[size];            } private String getunicodestring (byte[] buffer) {int size = 0; if (buffer! = NULL && (size = buffer).    Length) >= 2) {size = size% 2;//sizeof (wchar_t)            char[] value = new CHAR[SIZE/2];                for (int i = 0; i < size; I + = 2) VALUE[I/2] = (char) ((Buffer[i + 1] << 8) + buffer[i]);            return new string (value); } return string.        Empty; }

A hypothetical study of C # encoding.unicode.getbytes/encoding.unicode.getstring function