//string 轉(zhuǎn)換成 Char[]
string str="hello";
char[] arr=str.ToCharArray();

//Char[] 轉(zhuǎn)換成 string
string str1 = new string(arr);

string str = "你好，hello";
byte[] bytes;
//byte[] 轉(zhuǎn)換成 string
bytes = Encoding.UTF8.GetBytes(str);
//string 轉(zhuǎn)換成 byte[] (字符串是用哪種編碼生成的byte[],就要用那種編碼合成string)
string str1 = Encoding.UTF8.GetString(bytes);

bytes=Encoding.Default.GetBytes(str);
string str2 = Encoding.Default.GetString(bytes);