Question

我使用来自ObjectResult方法的实体框架Execute将数据绑定到WPF控件，如下所示：

using System;
using System.Data;
using System.Data.Objects;
using System.Windows;
using System.Linq;

namespace Microsoft.Samples.Edm
{
 /// <summary>
     /// Interaction logic for SalesOrders.xaml
     /// </summary>
    public partial class SalesOrders : Window
    {
        private AdventureWorksEntities context;
        private int customerId = 277;

    private void SalesOrdersForm_Loaded(object sender, RoutedEventArgs e)
    {
        // Instantiate the ObjectContext.
        context = new AdventureWorksEntities();

        // Define a query that returns orders for a customer.
        // Because lazy loading is on by default, SalesOrderDetails
        // related to a SalesOrderHeader will be loaded when the query
        // is executed.
        var query = from o in context.SalesOrderHeaders
                     where o.CustomerID == customerId
                     select o;

        // Execute the query and bind the result to the OrderItems control.
        this.orderItemsGrid.DataContext = ((ObjectQuery)query).Execute(MergeOption.AppendOnly);
    }

    private void buttonClose_Click(object sender, RoutedEventArgs e)
    {
        this.Close();
    }
    public SalesOrders()
    {
        InitializeComponent();
    }
}
}

该示例来自MSDN

它工作正常，但如何刷新绑定？以编程方式还是在数据库更改时？

Answer 1

应该从此事件中分离SalesOrdersForm_Loaded代码。

将此代码放在一个函数中。并在表单加载中调用它。现在您可以根据需要调用此函数。

我希望这是有道理的。

修改

您可以根据按钮点击/定时器或任何事件调用此功能，具体取决于您更新绑定的要求

刷新WPF中的EF数据绑定

1 个答案: