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POHow to force DataGridView to re-populate its rows using IQueryable<TEntity>
 

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  1. POHow to force DataGridView to re-populate its rows using IQueryable<TEntity>
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    <pre><code>BlaEntities TestContext = new BlaEntities(); IQueryable&lt;TestEntity&gt; Entities = TestContext.TestEntity; TestDataGridView.DataSource = Entities; </code></pre> <p>When I assign Entities to TestDataGridView's DataSource directly; I don't have to do anything to reflect my changes to the grid.</p> <pre><code>TestEntity entity = Entities.First(); entity.Title = "What up!?"; </code></pre> <p>This is more than enough to see the change in the TestDataGridView. One exception I encountered was that if I add another row to the TestContext using <code>TestContext.AddToTestEntity(...)</code> , it doesn't show up in the grid (contrary to deleting it) but I got it working using the BindingSource's Add method.</p> <pre><code>BindingSource source = new BindingSource{DataSource = Entities}; TestDataGridView.DataSource = source; source.Add(CreateNewTestEntity()); </code></pre> <p>Now the only obstacle left in my way is this: If I use filtering - like <code>TestContext.Where(t =&gt; t.Active)</code> - use it as DataSource to my grid, then change the first record's Active property to false, how do I refresh/reload the grid to reflect this without creating another instance of BlaEntities?</p> <pre><code>IQueryable&lt;TestEntity&gt; FilteredEntities = TestContext.TestEntity.Where(t =&gt; t.Active); TestDataGridView.DataSource = FilteredEntities; TestEntity temp = FilteredEntities.First(); temp.Active = false; </code></pre> <p>I see it is not active anymore in grid but since the grid should show only the active records, how can I remove it from the grid without removing it from the source?</p> <ul> <li>When I iterate over <code>FilteredEntities</code>, I can see that the <code>temp</code> isn't there anymore but I still can see and edit it in the grid. So what I need is something forces grid to iterate its DataSource (which is FilteredEntities) as well and populate itself again</li> <li>I tried calling <code>TestContext</code>'s <code>Refresh</code> method and <code>BindingSource</code>'s reset methods.</li> <li>I tried changing <code>TestDataGrid.DataSource</code> to <code>null</code>, then changing it back to <code>FilteredEntities</code> hoping to re-populate the rows, didn't work either.</li> <li>It works if I save my changes using <code>TestContext.SaveChanges()</code> and use another instance of <code>BlaEntities</code> like <code>TestDataGridView.DataSource = new BlaEntities().TestEntity.Where(t =&gt; t.Active)</code> but I need to use my current instance.</li> </ul> <p>So the question is, how can I make the TestGridView to reload its contents using FilteredEntities. Any advice would be greatly appreciated. Thank you.</p>
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