string fox; 
fox.ToLower()轉(zhuǎn)化成小寫字母 
fox.ToUpper()轉(zhuǎn)化成大寫字母 
fox.Trim()刪除前后空格 
fox.Trim(trimChars)刪除其它字符 
fox.TrimStart()刪除前空格 
fox.TrimEnd()刪除后空格 
fox.PadLeft(10)增加左邊空格，使字串達(dá)到某長度。 
fox.PadRight(10)增加右邊空格，使字串達(dá)到某長度。 
fox.PadX(10,'-')增加其它字符，使字串達(dá)到某長度。X指:Left/Right 
fox.Split(' ')將字串分解成數(shù)組 

System.Text.Encoding.Default.GetByteCount(fox);獲得字符串長度，一個(gè)漢字等于倆字符 

//獲得漢字的區(qū)位碼 
byte[] array = new byte[2]; 
array = System.Text.Encoding.Default.GetBytes("啊"); 

int i1 = (short)(array[0] - '\0'); 
int i2 = (short)(array[1] - '\0'); 

//unicode解碼方式下的漢字碼 
array = System.Text.Encoding.Unicode.GetBytes("啊"); 
i1 = (short)(array[0] - '\0'); 
i2 = (short)(array[1] - '\0'); 

//unicode反解碼為漢字 
string str = "4a55"; 
string s1 = str.Substring(0,2); 
string s2 = str.Substring(2,2); 

int t1 = Convert.ToInt32(s1,16); 
int t2 = Convert.ToInt32(s2,16); 

array[0] = (byte)t1; 
array[1] = (byte)t2; 

string s = System.Text.Encoding.Unicode.GetString(array); 

//default方式反解碼為漢字 
array[0] = (byte)196; 
array[1] = (byte)207; 
s = System.Text.Encoding.Default.GetString(array);