在ASP.NET Core项目中，我正在使用Docs: Cache-in-memory in ASP.NET Core中所述的内存缓存。
使用文档中的$viewquery= mysqli_query($connection,"SELECT * from orders");
while($row = mysqli_fetch_assoc($viewquery)) {
$id =$row['id'];
$full_name =$row['full_name'];
$email_address =$row['email_address'];
$contact_number =$row['contact_number'];
$address =$row['address'];
$user_id =$row['user_id'];
$reference_number =$row['reference_number'];
$additional =$row['additional'];
$payment_method =$row['payment_method'];
$transaction_status = $row['transaction_status'];
echo' <tr>';
echo '<td>';echo "<a href='#?idrequest=$id'><button type='button'
class='btn btn-primary' data-toggle='modal' data-target='#exampleModalLong'
data-formid='.$id.'>
$reference_number
</button></a>";
echo'</td>';
echo "
<td> $id </td>
<td> $full_name </td>
<td> $email_address </td>
<td> $contact_number </td>
<td> $address </td>
<td> $user_id</td>
<td> $additional </td>
<td> $payment_method </td>
<td> $transaction_status </td>
<td>
<a href='delete.php'>
<i class='material-icons' id='coloricon'>delete </i>
</a>
</td>
</tr>
";
}
?>
<div class="modal fade" id="exampleModalLong" tabindex="-1" role="dialog"
aria-labelledby="exampleModalLongTitle" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLongTitle">Modal title</h5>
<button type="button" class="close" data-dismiss="modal" aria-
label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<?php
include("conn.php");
$idrequest = $_GET['idrequest'];
$query = "SELECT * from orders where id ='$idrequest'";
$result = mysqli_query($connection,$query);
$view = mysqli_fetch_assoc($result);
$details = $view['summary_all'];
echo $details;
?>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-
dismiss="modal">Close</button>
<button type="button" class="btn btn-primary">Save changes</button>
</div>
</div>
</div>
，我发现行为异常。当缓存已满并且我尝试向缓存中添加项目时-现有项目从缓存中删除（因此缓存不再满），但是未添加新项目。这是错误还是预期的行为？
MyMemoryCache