StringBuilder動態添加字串

StringBuilder sb = new StringBuilder();        

sb.AppendFormat("{0} {1}", "Jeffrey", "Richer").Replace(" ","-");   

String s = sb.ToString().ToUpper();   

sb.Length = 0;      

sb.Append(s).Insert(8, "Marc-");  

s = sb.ToString(); 

Console.WriteLine(s);

 

如果要動態建立字串，應該用StringBuilder，因為String類是一個不變的字串。StringBuilder是可變的，修改時修改的是實際字串，而不是副本。

String s="aa";

for(int i=0;i<5;i++)

{

s+=i.ToString()+" ";

}這樣連接字串 ，這樣效率不夠高，

個人建議用StringBuilder建立

 StringBuilder s1 = new StringBuilder();

s1.AppendFormat("{0}{1}",s," ");

s.AppendFormat("{0}{1}",i," ");

for(int i=0;i<5;i++)

{

s1.AppendFormat("{0}{1}",i," ");

}