String operation methods: replace, delete and split strings

1、C# Replace string ）:

public string Replace(char oldChar,char newChar); Look for... In objects oldChar, If you find , Just use newChar take oldChar Replace .

Such as ：

string st = “abcdef”;

string newstring = st.Replace(‘a’, ‘x’);

Console.WriteLine(newstring); // namely ：xbcdef

2、Remove（C# Delete string ）：

public string Remove(int startIndex); from startIndex Position start , Delete all characters after this position （ Include the characters specified in the current position ）.

Such as ：

string st = “abcdef”;

string newstring = st.Remove(4);

Console.WriteLine(newstring); // namely ：abcd

3、Substring（C# String interception ）：

public string Substring(int startIndex); from startIndex Position start , Extract all characters after this position （ Include the characters specified in the current position ）.

Such as ：

string st = “abcdef”;

string newstring = st.Substring(2);

Console.WriteLine(newstring); // namely ：cdef

public string Substring(int startIndex,int count); from startIndex Position start , extract count Characters .
Such as ：

string st = “abcdef”;

string newstring = st.Substring(2,2);

Console.WriteLine(newstring); // namely ：cd

4、Split（C# Split string ）

public string[] Split ( params char[] separator )： according to separator The specified substring without character separation for this instance becomes Unicode A character array , separator It can be an empty array without delimiters or an empty reference .

public string[] Split ( char[] separator, int count )： Parameters count Specifies the maximum number of substrings to return .

Such as ：

string st = “ Chinese language and literature | mathematics | English | Physics ”;

string[] split = st.Split(new char[]{’|’},2);

for (int i = 0; i < split.Length; i++)

{

Console.WriteLine(split[i]);

}