问题描述
DevExpress在vb.net中刷新datagridview不起作用.
DevExpress Refreshing datagridview in vb.net not working.
我从数据库中将一个表加载到datagridview并显示所有数据
I load one table from my database to datagridview and it display all the data
问题-当我将另一个表从数据库加载到datagridview时，它不起作用.仅第一个表将显示其数据，而第二个表将不向datagridview显示任何数据.
Problem - When I load another table from database to datagridview, It wasn't working. Only the first table will display its data while the second table won't display any data to datagridview.
推荐答案
这种行为有两个可能的原因:
There are two possible reasons for this kind of behavior:
- 第二个数据表中的列不同.
其症状是:您看到网格中的空行与第二个数据表中的行一样多.
The symptom of this is: you see as many empty row in the grid as there are rows in the second datatable.
原因: Gridcontrol (确切地说是gridview)已经具有 Columns 属性，并且找不到匹配的对.
Cause: Gridcontrol (gridview to be precise) already has Columns property and doesn't find matching pairs.
解决方案:加载第二个数据表后，调用 GridControl.PopulateColumns().这将重新创建 Colums 属性.
Solution: Call GridControl.PopulateColumns() after loading the second datatable. This will recreate Colums property.
- Gridview没有意识到基础数据源已更改.
症状:您看到的是旧值.
Symptom: you see old values.
解决方案:调用 GridView.Refresh()
据我从您的评论中可以看到，您遇到的是前一个问题.因此，以这种方式进行操作:
As far as I can see from your comments, you have the former issue.So, do something in this manner:
gridControl.DataSource = myFirstDataTable();
/* some other code*/
gridControl.DataSource = mySecondDataTable();
(gridControl.MainView as ColumnView).PopulateColumns()
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