vb.net 如何在通过代码更改值后强制更新 TextBox 的数据源？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/21049825/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How can I force a TextBox's DataSource to update after a change in value through code?
提问by Sloth Armstrong
I am binding a TextBox's textproperty to a field value in a DataTableas such:
我将 aTextBox的text属性绑定到 a 中的字段值，DataTable如下所示：
With control.Item_Full_Description
.DataBindings.Add("Text", mdtItemMstr, "Item_Full_Description", True)
End With
When I make changes to the TextBoxmanually they are detected and updated in the data source, thus a save to the database is accurate. If I make the change behind the scenes, however, the data source is not updated and a save to the database results in the old value being saved back. Here is how I am updating the TextBoxin the code:
当我TextBox手动更改它们时，它们会在数据源中检测和更新，因此保存到数据库是准确的。但是，如果我在幕后进行更改，数据源不会更新，并且保存到数据库会导致旧值被保存回来。这是我TextBox在代码中更新的方式：
Item_Full_Description.Text = _mItem_mstr_c + " - " + Item_Description.Text + " - " + Unit_of_Measurement_UOM.Text
I am clearly missing a fundamental step to have this change reflected in the data source, however a search online is not proving to be useful. Maybe I am just uncertain of what to search so any advice or even guidance would be appreciated. Thanks.
我显然缺少在数据源中反映此更改的基本步骤，但是事实证明在线搜索没有用。也许我只是不确定要搜索什么，所以任何建议甚至指导都将不胜感激。谢谢。
采纳答案by xspydr
Since you are updating the control from code you need to force the binding source to update.
由于您是从代码更新控件，因此您需要强制更新绑定源。
Look into the BindingContext class... http://msdn.microsoft.com/en-us/library/system.windows.forms.control.bindingcontext%28v=vs.110%29.aspx
查看 BindingContext 类... http://msdn.microsoft.com/en-us/library/system.windows.forms.control.bindingcontext%28v=vs.110%29.aspx
BindingContext([data source]).EndCurrentEdit()
