我如何获得在Windows窗体DataGridView以显示新的记录时必然要EntityCollection [英] How do I get a Windows Forms DataGridView to show new records when bound to EntityCollection

问题描述

尝试新的记录添加到EntityCollection在运行，并与新的信息的DataGridView的更新。

Trying to add new records to the EntityCollection at runtime and have the the DataGridView update with the new information.

我试图在DataGridView直接绑定到实体集合（即对象集），并通过绑定到同一个集合的BindingSource。

I have tried bind the datagridview directly to the entity collection (i.e. ObjectSet) and through a BindingSource that is bound to the same collection.

我已经试过DataGridView.Refresh（），DataGridView.EndEdit（），和BindSource.ResetBindings（）除其他事项外，但似乎没有任何工作。

I have tried DataGridView.Refresh(), DataGridView.EndEdit(), and BindSource.ResetBindings() among other things, but nothing seems to work.

推荐答案

我希望这不是为时已晚=）我有一些作品在这里...

I hope it's not too late =) I have something that works here...

// Entity Data Model
private ManagerEntities context = new ManagerEntities();

// declare private member    
private BindingList<Currency> lstCurrencies = null;

// on form load, load data and bind to DataGridView's DataSource

private void Form1_Load(object sender, EventArgs e) {

     lstCurrencies = new BindingList<Currency>();

     ObjectResult or = ((ObjectQuery)currencies).Execute(MergeOption.AppendOnly);
     foreach (Currency c in or)
         lstCurrencies.Add(c);

     // dgMain is my DataGridView
     dgMain.DataSource = lstCurrencies;
}

// this will save objects that have changed. You might want to add logic for newly created and deleted objects.
private void btnSave_Click(object sender, EventArgs e) {
    context.SaveChanges();
}

这篇关于我如何获得在Windows窗体DataGridView以显示新的记录时必然要EntityCollection的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！