C # StringBuilder and String Analysis

C # is a common language. Here we mainly introduce C # StringBuilder and String, including StringBuilder, which is the best choice for many String concatenation or frequent operations on a String, do not use String or other features.

C #Difference between StringBuilder and String

A new instance is generated when String operations (such as value assignment and concatenation) are performed, while StringBuilder does not. Therefore, it is best to use StringBuilder when splicing a large number of strings or frequently performing operations on a String. Do not use String

In addition, we have to say a few words about StringBuilder and String:

1. It is a reference type and memory is allocated on the stack.

2. A new instance is generated during the operation.

3. Immutable)

4. Define equal operators (= and! =) Is used to compare the value of a String object (not a reference ).

C #StringBuilder and String examples:

 
 

  
  
Using System;
  
  
Using System. Collections. Generic;
  
  
Using System. Text;
  
  

  
  
Namespace Example22
  
  
{
  
  
Class Program
  
  
{
  
  
Static void Main (string [] args)
  
  
{
  
  
Const int cycle= 10000;
  
  

  
  
Long vTickCount = Environment. TickCount;
  
  
String str = null;
  
  
For (int I = 0; I< Cycle; I ++)
  
  
Str + = I. ToString ();
  
  
Console. WriteLine ("String: {0} MSEL", Environment. TickCount-vTickCount );
  
  

  
  
VTickCount = Environment. TickCount;
  
  
// I am angry when I see this variable name. Why do everyone make it? :)
  
  
StringBuilder sb = new StringBuilder ();
  
  
For (int I = 0; I< Cycle; I ++)
  
  
Sb. Append (I );
  
  
Console. WriteLine ("StringBuilder: {0} MSEL", Environment. TickCount-vTickCount );
  
  

  
  
String tmpStr1 = "";
  
  
String tmpStr2 = tmpStr1;
  
  
Console. WriteLine (tmpStr1 );
  
  
Console. WriteLine (tmpStr2 );
  
  
// Note that the value of tmpStr1 does not affect the value of tmpStr2.
  
  
TmpStr1 = "B ";
  
  
Console. WriteLine (tmpStr1 );
  
  
Console. WriteLine (tmpStr2 );
  
  

  
  
Console. ReadLine ();
  
  
}
  
  
}
  
  
}