stringBuilder与string的区别用法

stringBuilder，完全可以替代string,最主要的是它的效率高

//必须先实例化一个
stringBuilder sBuilder = new stringBuilder();
//您可以拼接执行SQL语句,易于阅读
sBuilder.Append("select * from tb1");
sBuilder.Append("where id=1");

上面同等于
strng sBuilder = "select * from tb1 where id=1";