. NET String Common operations

1. Take the length of the string

String str= "China";

int len=str.length;

2, string converted to bit code GetBytes

Byte[] Bytstr=system. Text.Encoding.Default.GetBytes (str);

3. String Miss Home StringBuilder ()

System.Text.StringBuilder sb=new System. Text. StringBuilder ();

Sb. Append ("Zhonghua");

Sb. Append ("The People");

Sb. Append ("Republic");

and "+" equivalent output of the People's Republic of China

4. String intercept Substring (starting position, intercept digit);

String str= "ASDFG";

String s1=str.substring (0,2);

S1=as;

5. Check whether the specified position is a null character char. ISWHITESPCE (string variable, number of digits);

String Str= "People's Republic of China";

Response.Write (Char. Iswhitespace (str,2));

Result is True

6. Whether the Chag is a punctuation char. Ispunctuation (' character ');

Method Ibid.

7. Convert characters to numbers

Response.Write ((int) ' Medium ');

8. Convert numbers to Characters

Response.Write ((char) 22269);

The result is the state word

9 Clear the space before and after the string Trim ()

String str= "China";

Str=str.trim ();

10. Replace the string string variable. Replace ("original character", "replacement character");

Example:

String str = "China";

Str=str. Replace ("Country", "central");

Str= "Central";

11. Delete the last character of the string lost method

String: String s= "123456";

Method One

S=s.substring (0,s.length-1);

Method Two

S=s.trimend (', ');

Char[] mychar={' 5 ', ', '};

S=s.trimend (MyChar);

12. String Split Split

Method One: Split with a single character

String str= "AAA,BBB,CCC";

String[] Sarray=str. Split ('. ');

foreach (String i in Sarray)

{

Response.Write (i.ToString ());

}

Results:

Aaa

Bbb

Ccc

Method Two: Divide with multiple characters

String str = "AAAJBBBSCCC";

string [] sarray=str. Split (new char[] {' J ', ' s '});

foreach (String i in Sarray)

{

Response.Write (i.ToString ());

}

Results:

Aaa

Bbb

Ccc

Method Three: Use String to divide

Using System.Text.RegularExpressions; Reference first

String str = "AAAJSBBBJSCCC";

string []sarray=regex.split (str, "JS", regexoptions.ignorecase);

foreach (String i in Sarray)

{

Response.Write (i.ToString ());

}

Results:

Aaa

Bbb

Ccc

13. The method of converting 123456789 to 12-345-6789

Method One

String a= "123456789";

A=int. Parse (a). ToString ("##-###-####");

Method Two

A=a.insert (5, "-"). Insert (2, "-");

Method Three

Using System.Text.RegularExpressions; Reference first

Regex reg =new Regex (@ "^ (d{2}) (D{3}) (D{4}) $");

A=reg. Replace (A, "$1-$2-$3");

14. Output 21 A simple notation

String Str=new string (' A ', 21);

15. Methods for obtaining random numbers

Random r=new random ();

int N1=r.next ();

Respons.write (N1);

16. Converting a string into an integer number

String mystring= "1234";

int myint=0;

Int32.TryParse (Mystring,out Myint);

Response.Write (Myint);