答案 0 :(得分:2)
使用var countQry =
from region in Regions
let areas =
from area in Areas
where area.RegionId == region.Id
select area
select new {
region.Id,
region.Name,
region.Designation,
AreaCount = areas.Count()
};
可以更轻松。
array
答案 1 :(得分:1)
检查会话中的值,如果匹配则设置选择的属性
<select name="District">
<option <?php if (!empty($_POST['District']) && $_POST['District'] == 'East'){ echo 'selected'; }?> value="East">East</option>
<option <?php if (!empty($_POST['District']) && $_POST['District'] == 'West'){ echo 'selected'; }?> value="West">West</option>
<option <?php if (!empty($_POST['District']) && $_POST['District'] == 'North'){ echo 'selected'; }?> value="North">North</option>
<option <?php if (!empty($_POST['District']) && $_POST['District'] == 'South'){ echo 'selected'; }?> value="South">South</option>
</select>
答案 2 :(得分:1)
只需根据会话中存储的值检查所选值。 您的选择将如下所示:
<option value="East" <?php echo ($_SESSION['District']=="East" ? "selected" : ""; ?>>East</option>
将选择正确的
答案 3 :(得分:1)
<select name="District">
<option value="East" <?php if($_SESSION['District'] == "East"):?>selected="selected"<?php endif; ?>>East</option>
... Repeat with all options ...
答案 4 :(得分:1)
使用以下代码:
<select name="District">
<option value="East" <?php echo ($_SESSION['District'] == "East") ? "selected" : "" ?>>East</option>
<option value="West" <?php echo ($_SESSION['District'] == "West") ? "selected" : "" ?>>West</option>
<option value="North" <?php echo ($_SESSION['District'] == "North") ? "selected" : "" ?>>North</option>
<option value="South" <?php echo ($_SESSION['District'] == "South") ? "selected" : "" ?>>South</option>
</select>
答案 5 :(得分:1)
<option value="East" <?php echo isset($_SESSION['District']) && $_SESSION['District'] == 'East' ? 'selected="selected"' :'' ;?> >East</option>
<option value="West" <?php echo isset($_SESSION['District']) && $_SESSION['District'] == 'West' ? 'selected="selected"' :'' ;?>>West</option>
<option value="North" <?php echo isset($_SESSION['District']) && $_SESSION['District'] == 'North' ? 'selected="selected"' :'' ;?>>North</option>
<option value="South" <?php echo isset($_SESSION['District']) && $_SESSION['District'] == 'South' ? 'selected="selected"' :'' ;?>>South</option>