c# combobox datatable initialize 문제

combobox.Datasource = DataTable;

로 해서 클래스가 로드될 때 바로 selectedIndex를 주려고 하니 에러가 났다.

combobox.items.count 를 찍어보니 0이 자꾸나옴.

그래서 저 문장 아래에 combobox.BindingContext = new BindingContext()

해주니까 정상적으로 작동...

After binding a list to combobox, its dataSource.Count is 5 but, combobox item count is 0. how can it be? I'm used to Web programming and this is in Windows Forms. So no combo.DataBind(); method exists. The problem here is, I'm trying to set the selected item programmatically. Since I don't see the combo.Items collection filled, I cannot set the desired item. Update A total update is needed I guess: datasource contains 7 items when bound to combobox, DisplayMember and ValueMember are appropriately implemented after databound, through the gui, I can clearly see the 7 items in the combobox combobox.DataSource.Count = 7 and combobox.Items.Count = 0 So the problem is here; since after databound no items are there in the ItemCollection of combobox; I cannot search for one to match and set the appropriate one. Here is a image for better understanding (But I'm pretty sure I'm missing sth simple) c# winforms combobox share|improve this question edited Aug 7 '12 at 10:39 asked Aug 6 '12 at 14:20 Beytan Kurt 9551328

1 Had you set the DataTextField and DataValueField accordingly? – Andre Calil Aug 6 '12 at 14:22 Or DisplayMember and ValueMember. What datatype is in DataSource? – Mr47 Aug 6 '12 at 14:29 Yes, maybe the question is not fully understandable. The databound event is successfully working, I can see my items in the combo through the gui. The problem is, in debug; after the datasource assignment the combobox does not contain something in the Items collection. Like after the render, all of the items are shown but before that nothing there. – Beytan Kurt Aug 6 '12 at 20:28 In comboBox (windows form) there is no DataTextField and DataValueField properties. where you found these? – Aminul Islam Aug 7 '12 at 9:57 @AminulIslam I updated my vocabulary habit problem and updated the image incase you don't believe me. Thanks – Beytan Kurt Aug 7 '12 at 10:39 show 5 more comments

 

1 Answer

active oldest votes

up vote 6 down vote accepted	After adding ddl.BindingContext = new BindingContext(); before the BindingSource assignment, everything worked fine. share|improve this answer answered Aug 7 '12 at 14:57 Beytan Kurt 9551328
	Does not work for me... – Nasser Jun 15 at 12:02 add comment