从另一个表单引用一个表单上的控件 [英] Referencing control on one form from another form

问题描述

如您所料，我对 .NET 有点陌生，只想从另一个表单引用一个表单上的控件.

As you can guess, I'm kind of new to .NET and just want to reference a control on one form from another.

通常我只会做 Form.Control.Property 但这不起作用，而且我通过 Google 找到的每个示例都不适用于我.

Usually I would just do Form.Control.Property but that doesn't work and every example I've found through Google doesn't work for me.

公共类等似乎过于复杂

有没有更简单的方法来做到这一点?我已经准备好认输了，现在只使用一个全局变量.

Is there a more simpler way to do this? I'm ready to throw in the towel and just use a global variable at this point.

我有一个包含我想要引用的控件的表单，frmGenerate 有一个名为 txtCustomerNo 的文本框.

I have the form containing the control I want to reference, frmGenerate which has a textbox called txtCustomerNo.

从这个表单到一个按钮的点击事件，我想显示另一个表单 frmCustomers，并让该表单引用 txtCustomerNo 中的值.

From this form through a button's click event I want to show another form, frmCustomers, and have that form reference the value in txtCustomerNo.

frmCustomers.ShowDialog()

它必须是一些我没有掌握的简单的东西.

It has to be something simple that I'm just not grasping.

推荐答案

在你要引用的控件所在的表单中:

In the form with the control you want to reference:

Public Property CustomerNo() As TextBox
    Get
        Return txtCustomerNo
    End Get
    Set(ByVal Value As TextBox)
        txtCustomerNo = Value
    End Set
End Property

在您希望引用控件的表单中:

In the form you wish to reference the control:

Dim CustomerNo as string = _sourceForm.CustomerNo.Text

这样做是一个糟糕的设计，但它是最简单的方法 - 应该让你走上正轨.

It's a bad design to do this, but it's the simplest method - and should set you on your way.

如果您只对文本框中输入的值感兴趣，那么以下可能更好:

If you are only interesting in the value entered in the text box then the following might be better:

Public ReadOnly Property CustomerNo() As String
    Get
        Return txtCustomerNo.Text
    End Get
End Property

以上将要求第二个表单引用第一个表单的实际实例.将以下内容添加到第二个表单中:

The above will require the second form to have a reference to the actual instance of the first form. Add the below to the second form:

Private _sourceForm as frmGenerate

Public Property SourceForm() As frmGenerate 
    Get
        Return _sourceForm
    End Get
    Set(ByVal Value As frmGenerate)
        _sourceForm = Value
    End Set
End Property

现在您可以执行以下操作来处理第二个表单的创建和启动:

Now you can do the following where you handle the creation and startup of your second form:

Dim customersForm as new frmCustomers
customersForm.SourceForm = Me
customersForm.Show()    

我在这里为您构建了一个示例项目:

I have constructed a sample project for you here:

http://www.yourfilelink.com/get.php?fid=595015

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