2010-12-07面试题

//请编程遍历页面上所有textbox控件并给它赋值为string.empty
foreach (control ontrol in this.controls)
{
if(boxcontrol is text)
{
textbox tb = (textbox)conrol;
tb.text=string.empty
}
}

 

//空值函数
nvl(expr1,expr2)
nvl2(expr1,expr2,expr3)
nullif(expr1,expr2) 比较1和2的值 相等返回null 不相等返回expr1的值

//replace 函数 替换
string [] sql ={"1234","2345","2356"};
for(int i =0; i<sql.length;i++)
{
sql[i]=sql[i].replace("23","ww")
console.writeline(sql[i])
}
//结果 1ww4,ww45,ww56