JQuery ajax 传递数组

$('#btn').click(function () {
$.ajax({
type: 'post',
url: './GridTable.aspx/call',
contentType: "application/json; charset=utf-8",
data: '{"userinfo":[{"name":"zs","age":"21"},{"name":"ls","age":"25"}]}',
dataType: 'json',
success: function (result) {
alert(result.d);
}
});

return false;
});

后台调用部分,两种方法均可

[WebMethod]
public static string call(Dictionary<string,string>[] userinfo)
{
System.Threading.Thread.Sleep(5000);
return str[0]["name"];
}

[WebMethod]
public static string test(List<UserinfoEntity> userinfos) {
System.Threading.Thread.Sleep(5000);
foreach (UserinfoEntity userinfo in userinfos) {
return order.rowid;
}

return "什么也没有";
}