Review of Common conversion methods to string

Code

Using System;
Using System. Collections. Generic;
Using System. text;
Using System. Text. regularexpressions;

Namespace Stringtest
{
Class Program
{
Static   Void Main ( String [] ARGs)
{
// Format output
Console. writeline (datetime. Now. tostring ( " Yyyy-mm-dd " ));
Console. writeline ( String . Format ( " {0} arrived in Beijing on {1: yyyy mm dd. " , " John " , Datetime. Now ));
Double D =   123.456789 ;
Console. writeline (D. tostring ( " C3 " ));

String S =   " 1, 2, 3, 4, 5, 6 " ;
String [] S2 = S. Split ( ' , ' ); // Note''
Foreach ( String I In S2)
{
Console. writeline (I );
}

//Specify a symbolic connection
StringJoin= String. Join ("-", S2 );
Console. writeline (join );

// Comparison of string and stringbuilder Efficiency
Datetime before = Datetime. now;
String A =   " Aaa " ;
For ( Int I =   0 ; I <   20000 ; I ++ )
{
A + = I;
}
Console. writeline ( " The time spent in string addition loop is {0} " , Datetime. Now - Before );

Datetime start = Datetime. now;
Stringbuilder sb =   New Stringbuilder ( " Aaa " );
For ( Int I =   0 ; I <   20000 ; I ++ )
{
SB. append (I );
}
Console. writeline ( " Stringbuilder's aggregate cycle takes {0} " , Datetime. Now - Start );

// Type conversion
String St =   " 123e " ;
Int Dd;
If ( Int . Tryparse (St, Out Dd ))
{
Console. writeline (dd );
}
Else
{
Console. writeline ( " Enter the correct number! " );
}

// Determines whether the string is null.
String Em =   "" ;
If ( String . Isnullorempty (EM ))
{
Console. writeline ( " Em is an empty string! " );
}

// Intercept
String Tr =   " --- BCD --- " ;
String End = Tr. Trim ( ' - ' );
Console. writeline ( String . Format ( " {0}: Length: {1} " , End, end. Length ));

// Toupper () has been optimized to improve efficiency.
String YZ =   " ABC " ;
String SZ =   " ABC " ;
Console. writeline (YZ. toupper () = SZ. toupper ());
// Recommended MVP
Console. writeline ( String . Compare (YZ, SZ, True ) =   0 );

// Regular Expression
RegEx re =   New RegEx ( " [A-Za-Z] + " , Regexoptions. None );
String [] Lines = Re. Split ( " 12r4t " );
Foreach ( String Line In Lines)
{
Console. writeline (line );
}

Matchcollection MC = Re. Matches ( " T45yu " );
Foreach (Match Ma In MC)
{
Console. writeline (MA );
}
Console. readkey ();
}
}
}

 

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