学步园

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);

 

如果要动态的创建字符串，应该用StringBuilder，因为String类是一个不变的字符串。StringBuilder是可变的，修改时修改的是实际字符串，而不是副本。

String s="aa";

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

{

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

}这样连接字符串 ，这样效率不够高，

个人建议用StringBuilder创建

 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," ");

}