VB.NET 在表单之间传递数据
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VB.NET Pass Data Between Forms
提问by Wanny Miarelli
Frist of all sorry for my bad english.
首先很抱歉我的英语不好。
I'm making an application in VB.NET and I have a little problem. I have two forms one main FORM (always open), and one that I open as Dialog.
我正在 VB.NET 中创建一个应用程序，但我遇到了一个小问题。我有两种形式，一种是主形式（始终打开），另一种是作为对话框打开的形式。
In the secondary form (such as the open dialog) I can choose what to do and based on what I choose I have to trigger an event in the main form. Let me explain, In the child form I choose the customer number 2, I press OK, and the main form has to load all the data related to the customer number 2.
在辅助表单（例如打开的对话框）中，我可以选择要执行的操作，并且根据我的选择，我必须在主表单中触发一个事件。让我解释一下，在子窗体中，我选择了客户编号 2，然后按 OK，主窗体必须加载与客户编号 2 相关的所有数据。
Obviously, being object-oriented vb.net I can not call a sub from another form (because I do not have access to the instance) and I can not declare a new one, because the main form is always open.
显然，作为面向对象的 vb.net 我不能从另一种形式调用子（因为我无权访问实例）并且我不能声明一个新的，因为主窗体总是打开的。
How do I then pass the id of the customer and raise the event to load?
然后我如何传递客户的 id 并引发事件以加载？
回答by
Expose the customer ID in the child through a Public or Friend property, for example (child form):
通过 Public 或 Friend 属性在 child 中暴露客户 ID，例如（子表单）：
Public Property CustomerID as Integer
Private Sub OK_Click(s as Object, e as eventargs) Handles OK.Click
CustomerID = id 'pass the value here
Me.DialogResult = DialogResult.Ok
End Sub
On the main form then:
在主窗体上：
If frmChild.ShowDialog = DialogResult.Ok Then
MessageBox.Show("Customer ID: " + frmChild.CustomerID)
End If
