< appSettings >
< clear />
< add key = "userName "value = "" />
< add key = "password "value = "" />
< add key = "Department "value = "" />
< add key = "returnValue "value = "" />
< add key = "pwdPattern "value = "" />
< add key = "userPattern "value = "" />
</ appSettings >
我需要把所有的key和对用的 value读出来