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作法：關閉延後載入

  • 發行項

您可以將 DeferredLoadingEnabled 設定為 false，以關閉延後載入。 如需詳細資訊，請參閱延後載入與立即載入的比較。

注意

關閉物件追蹤時，也會隱含地關閉延後載入。 如需詳細資訊，請參閱操作說明：擷取資訊並設為唯讀。

範例

下列範例顯示如何將 DeferredLoadingEnabled 設定為 false，以關閉延後載入。

Northwnd db = new Northwnd(@"c:\northwnd.mdf");
db.DeferredLoadingEnabled = false;

DataLoadOptions ds = new DataLoadOptions();
ds.LoadWith<Customer>(c => c.Orders);
ds.LoadWith<Order>(o => o.OrderDetails);
db.LoadOptions = ds;

var custQuery =
    from cust in db.Customers
    where cust.City == "London"
    select cust;

foreach (Customer custObj in custQuery)
{
    Console.WriteLine("Customer ID: {0}", custObj.CustomerID);
    foreach (Order ord in custObj.Orders)
    {
        Console.WriteLine("\tOrder ID: {0}", ord.OrderID);
        foreach (OrderDetail detail in ord.OrderDetails)
        {
            Console.WriteLine("\t\tProduct ID: {0}", detail.ProductID);
        }
    }
}

Dim db As New Northwnd("c:\northwnd.mdf")

db.DeferredLoadingEnabled = False

Dim ds As New DataLoadOptions()
ds.LoadWith(Function(c As Customer) c.Orders)
ds.LoadWith(Of Order)(Function(o) o.OrderDetails)
db.LoadOptions = ds

Dim custQuery = From cust In db.Customers _
                Where cust.City = "London" _
                Select cust

For Each custObj In custQuery
    Console.WriteLine("Customer ID: {0}", custObj.CustomerID)
    For Each ord In custObj.Orders
        Console.WriteLine(vbTab & "Order ID: {0}", ord.OrderID)
        For Each detail In ord.OrderDetails
            Console.WriteLine(vbTab & vbTab & "Product ID: {0}", _
                detail.ProductID)
        Next
    Next
Next

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