使用EF更新SelectedItem-WPF C# [英] Update SelectedItem Using EF - WPF C#

问题描述

我正在创建一个应用程序，以使我开始使用WPF并使用实体框架允许CRUD操作.

到目前为止，我已经能够从数据网格添加和删除项目，该数据网格从数据库中加载内容.

但是我的更新方法有问题.

在数据网格中，当我选择一行并对其进行更新时，它将更新表的第一行，而不是我选择的行(例如，第三行向下).

我已经发布了我认为很重要的代码片段.

I am creating an application to get me started with WPF and using entity frameworks to allow CRUD operations.

So far I am able to add and delete items from a data-grid which loads the contents from a database.

But I''m having problems with my update method.

In the data-grid, when i select a row, and update it, it updates the first row of the table, not the row i selected (third row down for example).

I''ve posted the code snippets of what I think are important.

private void Page_Loaded(object sender, RoutedEventArgs e) 
{ 
        DBEntities context = new DBEntities();

        var orgTypeDetails = (from o in context.OrganisationTypeDetails
                              select o).ToList();

        dgOrgTypeDetail.ItemsSource = orgTypeDetails;
}

private void btnUpdateOrgTypeDetail_Click(object sender, RoutedEventArgs e) 
{ 
    OrganisationTypeDetail selected = dgOrgTypeDetail.SelectedItem as OrganisationTypeDetail;

        if (selected == null)
            MessageBox.Show("You must select a 'Type' before updating.");
        else
        {
                OrganisationTypeDetailUpdateView update = new OrganisationTypeDetailUpdateView();


                update.ShowDialog();
                Page_Loaded(null, null);
        }
    }

任何帮助将不胜感激.

非常感谢，格雷格.

Any help would be much appreciated.

Many thanks, Greg.

推荐答案

它应该可以工作.我可能建议的是处理SelectionChanged事件.然后，您可以使用更改后的值更新文本框，然后查看发生了什么情况.当您单击文本框时，可能会丢失所选的项目.

It should work. What I might suggest is to handle the SelectionChanged event. Then you can update a textbox with a value when it changes, and see what is happening. Might be loosing the selected item when you click on the text box.

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